Motor start up current calculator

Mark Cartwright
When the current flow is greater than the rating of the overload, the heat generated by the resistive element warps a bi-metallic spring causing the overload Our starting torque controllers help reduce mechanical and electrical stress on motor circuits and systems by limiting voltage at start-up. Inductive loads (typically electric motors, electric pumps, electric compressors and air conditioners) require 6-8 times more current to start than to run. It's one of those "Ghost" things. 4-kW power supply with the inrush-current limiter and a slow-start circuit, which allows the separation of the inrush and the start-up processes. Single Phase Motors Kilowatts (kW) to amps (A) conversion calculator. This is why AC units have a LRA Locked Rotor Amperage which is usually the start-up current. As motors age, the current drawn generally rises because winding insulation resistance drops. 0 times 10^-6 farads. b ) Alternating current motors. As a result the stator draws high current and by the time the motor reaches to full speed, a large amount of current (greater than the rated current) is drawn and this can cause heating up of the motor, eventually damaging it. A margin of 15 % between load torque and available motor torque during start-up is recommended. Star-Delta Starter Starting Method This is a starting method that reduces the starting current Home / Technical Articles / How Often Can a Motor Be Started? Each time an a-c motor starts from rest, then accelerates some driven machine to full speed, the motor is stressed three ways. 52, “Rating or Setting for Individual Motor Circuit” and manufacturer recommendations for Motor starting current . The calculation uses the simplified method given in our site post 'How to Calculate Motor Starting Time' to determine the approximate starting time. The overloads must be sized to allow the motor to start under normal starting conditions. Normally, The Starting Current Of An Induction Motor Is Six To Eight Time Of Full Load Current. It would only hum when I tried to start it. . that can cause motor and load damage as well as electrical network fluctuations. 4-kW power level. 5 minutes between starts. Check the nameplate to be sure. When voltage is first applied to the field winding of an induction motor, only the conductor resistance opposes the flow of current through the motor winding. There is no way to calculate the Starting Current or Locked Rotor Current (LRA) You'd be better off looking up a motor nameplate and going from there. Start-up torque increases by 20% ( x 1. Current passing from line voltage, through the contactor, is routed through a resistive element before being applied to the motor. 1 Feb 2000 Your engine-generator set (gen-set) starts up and reaches speed. To measure the inrush current, technicians can use either a hard-jawed clamp meter or a flexible current probe. ing continuous operations, the motor can be loaded up to the rated torque. By slowly ramping up the supply voltage to the motor, a smooth start without excessive current flow can be achieved. During the starting condition, an induction motor draws  Normally, The Starting Current Of An Induction Motor Is Six To Eight Time Of Full Load. Wide variations from these figures can arise, especially on single phase motors, and engineers should, whenever possible, determine the actual f. Watch out: When you are replacing an electric motor capacitor, never put in a lower rated capacitor. Trace 1 in Figure 3 depicts the start-up of a 2. Finally, apply the Watt’s Law formula and divide the number of watts by the voltage to find the amps. A motor run capacitor is used to continuously adjust current or phase shift to a motor's windings in an effort to optimise the motors torque and efficiency performance. 17 Induction motor below 600V 0. O'Hearn, P. So if a motor is rated at 100 watts , it might go briefly to a 125 watt or more. Does VFD take care of the startup current problem? The startup current for most correctly operating blower motors is low (usually less then 200% full load amperage), so the OP's concern should not be much of an issue. ) - provided as a guide to the selection of suitable MEM control  1 May 2014 However when the fan attempts to start the staring current gets to 88 Not a lot going right here regarding the protection, current calculation and cable size. When sizing the cable for your motor you don't need to worry about start up for this current draw is an inrush current which lasts for a sec. Starting current is typically six times a motor’s rated full-load current, and this inrush current stays high until the motor reaches about 75 percent of rated speed. the current drawn from the mains by an electric motor upon starting. If Start Inhibit is not used, must wait until Thermal Capacity Used (TCU) falls below 15% before the motor can be re * Disclaimer: Because of the tremendous amount of variables that exist in generator power provision and transmission, Absolute Generators strongly suggests that you seek the advisement of a certified electrical professional familiar with your situation (and potentially local electric code when performing permanent installations). 5 In). Very small dc motors, however, may be started directly by Technical note Starting methods for AC motors Reducing electrical and mechanical stress at start-up The starting current of an AC motor can vary from 3 to 7 times the nominal current. It shows the peak current for the first half cycle as being close to 30 amps and then decaying  current inrush for the electrical power system during motor start. But why this inrush of current happens in only starting of Induction motor, why not in running condition. This feature is not available right now. 22 Jun 2015 The problems connected to motor starting operations are linked to the type which a where CS represents the inrush torque and Cmax the maximum torque; Table 2 – Typical values of some electrical and mechanical  During start-up the motor absorbs a high current which causing a big voltage drop at the secondary of the transformer and a significant voltage drop supply  21 Feb 2011 The Starting Code Letter on the nameplate of an AC induction motor can be used to estimate the maximum starting current of the motor. That how comply calculate the current of three phase motor and how 30. 1 1 10 100 1,000 TIME IN SECONDS 10 100 1,000 10,000 CURRENT IN AMPERES Motor and Motor Circuit Damage Protection 10 H. We deliver on that promise through innovative design, quality manufacturing, and exceptional customer support. RK_SP, LPN-RK_SP, FRS-R and FRN-R fuses are sized for motor running “back-up” protection and provide superb short circuit protection at the same time. 33 divided by 66. On start, a motor is at standstill and the current leaps toward what is termed 'lock rotor', or in general terms, a stalled rotor. This will be the load factor for the motor. ie 60 amps total and 3 phases = 3, 20 amp fuses? Download : 2014 NEMA Motor Data Calculator - WELL-GUARD® Pump Panels,Fractional Horsepower Starters,NEMA Type S Motor Starters (8536 8736 86 There are two types of generators available: externally and internally regulated. 732 x K x I x D)/VD . l. My old capacitor was the original that came with the motor. We've detected that you're using adblocking software or services. Product lines: Smart Motor Controllers (SMCs), AC Variable Frequency . 1A. 25 and then take the size cable up from what you get and you will have no problems. ) Part Winding - That is the draw of the motor while running. This is because in these motors, the start winding stays in the circuit after the motor has started. C) centrifugal switch 6. 3A and 1. Then you were able to switch up to rated voltage. • Motor-running current. 4. As long as the motor will maintain speed state current is then in the range of 0. Less power runs through it than the product of its voltage and current, and the conversion factor between the two values is known as the motor's power factor. For example if your overload relay is work form 5 to 12 amps. A motor drives the generator which, in turn, supplies power to the motor to be started. To start them, the overcurrent protection system must permit the starting current, also called the locked-rotor current, to flow during the normal starting period, and then the motor-running overcurrent must be limited to approximately the nameplate full-load ampere rating. Typically the motor appears to start smoothly, then is tripped off line by relay action before it reaches full speed. Rating (P). 0 V and I OUT = 300 mA. A potential relay is difficult to check and Place the motor under a fixed load, for example by having the motor winch up a weight. 05 = 13. Most are externally regulated. What you need to do is not so much a calculation, but rather a look-up of the motor data. If you use a Direct-on-line starter , then what the previous answerer has said , is correct. It is a time delay so the motor has the current it needs to start. During the starting period a current significantly larger than the motor’s normal full load running current is drawn, the magnetic fields within the motor and back emf increase, and the mechanical load accelerates. General guidelines  order to reduce motor inrush current and starting torque. Monotonic, Inrush Current Limited Start-Up for Linear Regulators 3 Figure 3. Or, place a 1-ohm resistor in series with the motor and measure the voltage drop across the resistor to find current using Ohm's Law, V = R*I. Soft starters adjust motor voltage through use of back-to-back thyristors or triacs in each ac supply line to the motor. In fact, the small inductance in a motor winding is a slight impedance to the inrush (hence the term), though very slight unless it is a high inductance winding. _____ It shows the peak current for the first half cycle as being close to 30 amps and then decaying over subsequent half cycles as the motor spools up. Checking the Inertia Ratio Large inertia ratios cause large overshooting and undershooting during starting and stopping, which can affect start-up times and settling times. Figure 1 illustrates what happens when we run an uncoupled motor at varying voltage. What sort of sizes have you come up with ?? Logically 4mm would probably deliver 35A over that sort of run (without getting my books out on a Sunday afternoon) but you've got motor start currents to consider which could be pretty high. The switch over will be at too low speed and this will result in a high starting current, see fig 2. Another issue is that motors require two types of protection, overload and short circuit. Motors that start up from a stopped position will always draw much more current then when running, especially when a load is attached but even without. HowTo: How to Size Generators for Soft Started Motors There are many instances where it is necessary to start a large motor or motors from an isolated power supply as for instance, on board ship or at a construction site etc. I a, flowing through the armature winding of resistance R a and I sh flowing through the field winding of resistance R sh. Since Power = Torque * RPM, the torque must be infinite, for a fixed power at zero speed. 3. The rated current is 15. A 1 Hp electric motor therefore will require 3-4kVA for start up. Considering that the operation of the motors will be by using VFDs, but in an abnormal situation I must start a motor directly, in this case it can be accepted that the voltage drop at start, in the secondary of the transformer due to the magnetizing current is more than 10%? Soft Start of Induction Motor by ACPWM. 6. 3 Phase Induction Motor current calculator is used to calculate the rated and full load amperes of the motor. amount of thermal capacity used at start. Note! - in the calculator above FLA is RLA + 25%. Motor current: 26. VFDs, which can go from 0 Hz up to the operating speed of the connected motor. This would, it is true, solve the starting problem, but the motor would no longer be adequately protected during run. Trace 4 shows the input current measured with a current probe. E. Since the starting current of an electric motor can be several times greater than the motor’s rated current, it becomes necessary to limit the current by means of a starting resistance. Phase. Cable Sizing Vs Starting Current Of Dol Motor - posted in Motor Starting: Can somebody help me in this. This system avoids the frequently used TRIAC-phase-angle control drives and provides variable AC voltage during the starting of the single phase induction motor. Soft-Start Using an NMOS FET Following the Output Being Driven by TPS3803-01 SVS Figures 4 and 5 show the rise times of the regulator output voltage with and without the soft-start circuitry for V IN = 5. A different example of inrush current is an AC/DC input stage that uses a rectifier, capacitor circuit where the capacitor needs to be charged up to its nominal voltage as shown in Figure 2. What is the power consumed by a 50 hp motor at no load condition ? If you can just measure the current at start up with no load and then it is simple calculation. The overload device cannot trip, or cause the motor circuit to open the motor branch circuit conductors, during start up, and the overload device must allow the motor to carry the load, to operate at full running current, 460. Find dry, electrolytic, nonpolarized start capacitor models in a wide range of sizes and MFD ratings. Example: You want to run a cable for a powerpoint in your shed 100m away. Industrial grade motors usually are rated for continuous duty. If you can educate the customer on the best practice for starting certain motors firstly. Lower than 50% running duty cycle is recommended. Assuming a start-up energy of 0. 5Kw however the in-rush start current could is to see my UPS datasheet than to calculate what is the power that the motor . However, the remaining 3-wire motors with run capacitors all list current in the red lead. Start-up current, also referred to as locked-rotor current, is often 6-8 times a motor’s running current. Amps to kW calculator DC kilowatts to amps calculation. The motor is 75KW,415V,What is the factor that i need to consider beside the max. 5kW AC motor. Another item on the nameplate will give a code letter that tells the ratio of starting current to FLA/FLC. I understand electric motors require a significant current draw to start up, but of course this isn't listed in the specs. This applies to three-phase AC motors. 47 allows a tolerance of only 10% when reporting nameplate full-load current. The starting current is the initial current flow into the motor which is usually very high and controlled by using starters. Please try again later. These two parameters are described as follows: ACCELERATION – This parameter is determined by putting a step in current into the motor winding to bring the motor up to rated speed. If overloaded for a long enough period of time the fuse or heater protection will burn up instead of the motor and conductors. c from the motor rating plate in each case. – Calculation example . For these printers, the current is set through your firmware configuration. What if you are using a motor control that limits the peak current to the motor? ELECTRIC MOTOR WATTAGE GUIDE: Electrical motors present special electrical startup considerations. Starting torque must therefore be limited by safe motor current. EEVblog Electronics Community Forum (and therefore the current) on start-up of the motor if that's what you truly need. The conversion from amps, a measure of electric current, to horsepower, a measure of power output by a motor, can be done using a fairly simple formula. So as 18. 01. If you have motor that is constantly burning up check the overload protection or add if necessary. I figure that it draws about 15-20 amps under load but that does that account for the start up in rush current? Should I be using a 50-60 breaker/fuses? If I'm using fuses, I assume that I would need to divide the amps by phases. For for direct online starting the motor would be operated at full voltage (per unit voltage =1). Calculating Motor Start Time Timothy L. 54 x 500 x 0. When the switch S is in the START position, the stator windings are connected in the star as shown below. Course Outline In this course, a method is described to approximate the motor starting time using the characteristics provided by the manufacturer. This causes a drop in generator voltage. run-up time expired, to a current level higher than the rated motor current. Generator Size to Start Motors. The inrush-current value is 5A, a relatively low value for a 2. Round, molded cases can protect start capacitors from oil, dirt, moisture and grease, helping prolong maintenance-free performance and reduce replacement costs. The overload device must trip when needed but allow the motor to start and carry the designed load. Fast Acting Fuses As a beginning place, you look at the manufacturer’s specifications for that specific motor. DC Motor Resource: Motor Calculations, Formulas And Examples. A split-phase motor that has a current relay and a start capacitor is called a(n) ____ motor. The transformer short circuit current is calculated as follows: Motor in rush is usually about 8 x Full load current. A stepping motor is not intended to be run continuously with rated current. Heating of the motor causes the resistance of the windings to increase and the residual flux in the magnets to decrease. L . These capacitors usually have capacitance values of over 70 µF. The starting current requirement of an induction motor is dependent on the starting method that you use. but in some instances the start-up currents are still large enough to cause problems. Mechanical damage is associated with the high starting current drawn by a ramping induction motor. There When you need motor start and run capacitors, shop at Grainger. Instructions: You only need to fill in the columns colored in orange. The operating voltage at the terminals of the motor shall not drop more than 5 percent below the voltage rating of the motor while the motor is operating at 115 percent of the full-load current rating of the motor. Scope probes can present their own set of problems if not used correctly . 15 8-14 pole 0. Generator Size Required to Start Generators. It may be hand started in either direction, coming up to speed in a few seconds. In addition, motor terminal voltages only affect current to the first power, while slip varies with the square of the voltage. Values will vary in service with load conditions, condition, age and type of motor. Discover Schneider Electric range of products in Motor Starters and Protection Components: TeSys K,TeSys D,TeSys F,TeSys B,TeSys SK and SK GC Mini-Contactors,TeSys Control Relays,TeSys GC, GY, GF,D range,TeSys LF,Motor Starter Combinations K Series,TeSys LE Enclosed Motor Starter,TeSys LG, LJ Enclosed Safety Starters,E An advantage of using the current-based load estimation technique is that NEMA MG1-12. 58 x the motor current. The inrush current at start-up for a motor is not an inductive spike. Why is it stamped? Voltage drop during motor start-up: ΔUcable = 0. When selecting a DC motor for an application, or when developing a powered prototype there are numerous calculations and formulas which must be considered to produce a well-functioning, sufficiently-powered, and safe device. Back talking about the Harley LiveWire , I commented that the bike, along with the Zero SR, didn’t seem to pull as hard as my PMDC-equipped bike right off the line. Enter the motor sizes in the order that they will be started and select “Staggered start = Yes” below. Depending on the size of the motor, the start-up current can be up to six times greater than the running current. DC motor kicker, capacitor - Page 1. The element uses memory in the form of a Thermal Capacity used register. In Fig. 7(B). This calculator computes the maximum speed of a stepper motor, which is limited by the time it takes for the coil to energize to it's maximum holding current, and then de-energize as polarity flips. The current I in amps (A) is equal to 1000 times the power P in kilowatts (kW), divided by the voltage V in volts (V): As the motor windings become energised, they present resistance to the flow of current and the current begins to drop. activar™ - motor start calculator The following calculator computes the expected performance of NEPSI's actiVAR™ in reducing voltage sags associated with large motor starts. Notice that the single phase curve, unlike its three phase cousin, consists of only one wave form. Most generators can provide 100% overload for start up purposes. BE CAREFUL !! It can hurt to tangle with a three-phase motor. In your case the nameplate gives the start-to-rated current ratio, Ia/In, as 7. . As a motor reaches running speed, the current subsides to its normal running level. Multiplying these values gives the starting current of the motor. Sinusoidal current drive is known to deliver improvements in performance in terms of motor vibration and acoustic noise. This means the motor is overloaded by 10%. A good rule of thumb is 50 to 100% of the total load. If the motor is hot, thus having some thermal capacity used, the relay will not allow a start if the available thermal capacity is less than the required thermal capacity for a start. A three-phase motor may be run from a single-phase power source. We have had a project where we have had to over-size the generator due to the initial start up of several motors at once. So, how often do you want to Some printers have digipots for digital current control. Since 1994, Ametherm has provided the most reliable and effective inrush current limiting solutions available. Even if it does get the load up to speed the motor will overheat and burnout if it is too small for the application. It will only develop 2/3 of the 3-φ power rating because one winding is not used. Motor starting is affected by motor and generator design, and load on This includes induction-type and synchronous-type three-phase alternating-current motors. Both those points said. To be compliant, the cable should have no more than 5% volt drop over its total length for full load current and no more than 10% volt drop for start up current. the motor will develop at synchronous speed with rated voltage applied at rated frequency and with normal excitation Pull-In Torque The pull-up torque of an alternating-current motor is the minimum torque developed by the motor during the period of acceleration from rest to the speed at which breakdown torque occurs. In certain instances, such a current is prohibitive. A successful salesman for General Electric's motor division once How to control inrush current (starting current) in a Permanent magnet DC motor used for an electric vehicle to a limited value? the start very smooth and limit the current. Best Answer: Its not easy to know what kind of electrical device you are talking about, but anyhow I think this formulas will help you. Electric Motor Calculators: Motor Estimators These tables use mathematically calculated values and are intended for use as a means of indicating expected values for Veris current sensors, power meters and similar product related uses. Overloads are not designed to protect the branch-circuit conductors during short-circuit or ground-fault conditions. If it is a premium efficiency system it might use an ECM motor, which is electronically managed and also has a low startup current. The motor can not accelerate (speed up) if the load curve intersects the motor curve. As the motor begins turning and the revolutions per minute increase, the current falls until the motor reaches running speed. 96 contactor not avilable in market then you can use 20 or 22 one th contactor for your motor. require 6-8 times more current to start than to run. Divide by the rated full load current from the motor nameplate. Fill in the HP of the motor's) in their starting sequence, select the start method (Direct On Line or Star Delta) and press Evaluate. Motor sizing made simple. Motor starting can be in 3 ways Motor Over-Current Sensor Detects over-current situation with a motor or other DC device. For NEMA17 motors, depending on size, the limit on current is generally between 1. I usually try to use a Motor protection circuit breaker and set for the full load current ,they have an adjustable setting pot on the face and an on/off switch. The start-up current is sometimes called the inrush current or locked-rotor current. At an inflow of 250 gpm, the pump shown in the example would start about eight times per hour and remain off just 3. This is because a large amount of energy is required to magnetise the motor enough to over-come the inertia the system has at standstill. First, the sudden inrush of starting current (typically 6 to 8 times the nameplate amperes) causes high electromagnetic forces tending to tear the winding apart. On start up the motor will draw more current. It cannot substitute the individual calculation, which we will glady provide on the basis of your motor and machine data. To avoid this, a suitable DC motor starter must be used. The Motor Wire Size Calculator will calculate the proper wire size for a given motor HP and voltage. Measure the motor current with the current function of a digital multi-meter placed in series with the motor. All run capacitors are designed for continuous duty, and as a result, have a much lower failure rate than start capacitors. As discussed earlier, in a BLDC motor, the torque remains constant for a speed range up to the rated speed. load current when sizing the cable?ie. Alternating-current electric motors and transformers may draw several times their normal full-load current when first energized, for a few cycles of the input waveform. com's electrical & electronics engineering calculators, formulas & examples to analyze voltage, current, resistance, power, conductance, capacitance, inductance, impedance, single & three phase AC & DC transmission lines or any open or closed circuits characteristics. This means that if rated voltage were applied to the motor, and its stator winding was delta-connected, then its starting current will be 7. Please feel free to check it out and help us create vibrant community. They are designed to control acceleration and deceleration of three-phase motors, with options available for current ranges from 0. A “cold” motor will have higher torque than a “warm” motor. Possibly 25%. RLA - "Running Load Amps" - current drawn during normal operation of electric motor. I'm adding fuses and a relay for a 10 HP motor on 480v. Once the motor starts, the interaction of rotor and stator keeps the field spinning. 5 x 160 or 1,200 Amperes. Note: the following table contains approximate full-load currents for motors of various types, speeds, and frequencies. How to Use a VOM to Check a Motor Capacitor - step by step Measure the motor current. voltage, current or resistance) over a specific period of time. 5. Only meters that offer an inrush button can measure inrush current. 1 amperes are given in nameplate. The amp rating on breakers is the amperage required to be run continuously to trip the breaker. Starting & Running current are the three important factors for the rating of AC induction motor. (overload, locked rotor, too frequent or prolonged acceleration, duty cycling applications). When an electric motor, AC or DC, is first energized, the rotor is not (wye at start and then delta) during start-up to reduce the current  The following calculators can be used to calculate the motor starting voltage drop and starting inrush current of 3 phase induction motor using infinite source  Calculate, or estimate, the inrush current (also called locked-rotor current or starting current) of a motor given the motor's energy rating in ampere-volts and the  The motor current calculator calculates the full load current of an AC induction motor. The high motor inrush current (I ms) flows through the generator armature windings and is affected by the reactance. The Locked Rotor Torque or Starting Torque is the torque the electrical motor develop when its starts at rest or zero speed. As has been stated previously DOL starting is not normal for a motor of this size. 5 Kw motor Full load current is about 12 amps at ( 415 volts in Australia) when started Direct on line. because of the higher voltage in delta the current will also be higher so the 1 overload in phase current is . The calculators below can be used to calculate electric motor amps, horsepower of current drawn when full-load torque and horsepower is reached for the motor. Voltage is either ramped up to full voltage, or is limited to provide current limit starts. Due to the soft start, the input current usually does not exceed the steady state input current of the converter during turn-on, see the normal curve shown in Figure 3. Power up the motor normally and determine the no-load * rpm when the motor, as viewed from the front, is rotating clockwise (CW); repeat with the motor spinning counter clockwise (CCW). The motor size is 5. The motor starting or "inrush" current, which is also called "locked rotor current," is only present during the acceleration period at the moment the motor is started. To determine the starting current use the following formula: A Code letter table and corresponding factors can be found in Na tional Electrical Manufacturer s Association (NEMA) Motor and DC Motors - Full-load Currents - Full load amps in 120 and 240 volts DC motors; Electric Motor Wiring - 480 Volt - Electrical motor wiring data - NEMA amps, starter size, HMCP size for motors ranging 1/2 to 500 hp; Electrical Motors - Frame Dimensions - NEMA electrical motor frame dimensions This is not taking into account for voltage drop on long runs. QUESTION: Are motor branch circuit conductors required to be sized at 125 percent of the motor full load current (FLC) to handle the motor starting current? ANSWER: No. AC Motor clutches also help prevent large current spikes. starter size, HMCP size for motors ranging 1/2 to 500 hp; Electrical Motor  This period of high current demand, referred to as inrush, may be as great as to calculate the inrush or amperage needed for that specific motor during start up. "Inrush current," sometimes called locked-rotor current or starting current, refers to the electrical current flowing through the components of a motor in the fractions of a second after the motor's power turns on. As the motor comes up to full speed, the current level will be at the level specified on the motor nameplate as the full-load current. It is the current drawn by the motor when the load applied is heavier such that the motor stops rotation. The motor will accelerate exponentially. It is not a 50/50 split but has to be calculated by a special formula which, simply put, means the overload and each of the delta and line contactors only “see” 0. b. Hello, I am having problem on how to determining the statup/inrush current of a 7. A large DC motor will pick up speed rather slowly due to its large rotor inertia. The current setpoint can be easily adjusted with the trimpot. During a direct-on-line start, the starting torque is also very high, and is usually higher than required for most applications. 5 to 3 x M N (depending on the motor) •Features: How Does Start Capacitor Help Start Motor - Permanent Split Capacitor Motors or PSC Motors use run capacitors to help the motor be more efficient while running. Upon entry of the required data, the calculator computes the pump down volume, the fill time at various inflow rates, minimum run time, run time at various inflow rates and the starts per hour. 44) Torque and supply current This is the second important characteristic of a D. Usually the capacitor is connected in series to an inductive winding into an auxiliary circuit for a single-phase motor or in parallel phase/phase into three-phase motors when The bigger the reference voltage (VREF), the higher the current (A) that the chip will send to the motor. On other printers the current is adjusted via trimpots on the motor drivers themselves. If the load factor is 1. The interesting part about motors is that the amount of start-up current and the current the motor uses after it is running is not the same. 5 and 2. The spread sheet performs an iterative calculation based on pre-start load inputs and starting motor data. To prevent this, motor starters are needed. This page contains test results and measurements for various electrical loads. A soft starter continuously controls the three-phase motor’s voltage supply during the start-up phase. The high current The voltage range for a start-up capacitor typically ranges from 250VAC to 450VAC. If you don't have access to the motor then you need to measure the current and time it yourself. study can be performed by various calculating methods using the digital computer. The motor manufacturer studies the effect of placing in and taking out the capacitor to increase starting torque with as little winding flex as possible. In this VFD case will the motor's startup current be more than 270A? The motor will sometimes run at its rated current. So this data is provided by the company. Inrush current, input surge current, or switch-on surge is the maximal instantaneous input current drawn by an electrical device when first turned on. The starting current of induction motor is objectionably high- this concept we know and utilize this in applications. High currents and current peaks lead to high fixed costs charged by the power supply companies (peak current calculation) and to increased mains and generator loads. This system runs continuously and current surge, caused by the starting of the equipment motor, is isolated from the remainder of the load. 5 to 3 A RMS for a 220-240 V mains voltage. Starting current is typically six times a motor's rated full-load current, and this inrush current stays high until the  16 Mar 2018 If the motor current is 22A and the rated full load current is 20A, then the load . 8 Jun 2019 Starting of DC Motor The starting of DC motor is somewhat different from the starting of all other types of electrical motors. The phase-to-phase voltage for a 3-phase supply, or the phase-to-neutral voltage for a single phase supply. If the motor current is 22A and the rated full load current is 20A, then the load factor is 22/20 = 1. Depending on the But you do not know the difference in speed or time to accelerate so you must start with the characteristics of your motor stall torque when current limited in the initial rotor lock situation. From a standing start, the motor will draw somewhere close to the stall current at first and then drop to the current required to maintain whatever speed it's operating at. When you start a motor across-the-line with a gen-set, the motor represents a low impedance load while at locked rotor or stalled condition. calculate the input kVA to the motor compared with time, right up to the point that the motor reaches   Estimate the KVA for your application, accurately calculate the size of Sizing for VSD motor starting does not take into account Harmonic Distortion levels. If the nature of the load means that the motor may take somtime to get up to full speed there would be a problem in that the motor would be drawing a very high start up current until it reaches full speed. This type of starter can supply more current to the motor than other soft starters, while keeping voltage low. It's not uncommon to start the motor/pump of this rating DOL provided you've ensured that the voltage drop at the bus from where it is fed is within the limits. simply the force needed to start the robot moving (this could be measured empirically with a force scale). My motor current chart gives 35 A per phase. I could calculate the working current of the motor from the rated kW and 7 ( times the nominal current for an induction motor at startup) but the  that motors have a large inrush current at 'start'. The starting current for a DOL start is normally 6 to 7 times the rated full load current of the motor. These range from luxurious motor-coaches featuring all of the amenities you might expect to find in a permanent home to the more modest pop-up campers and travel trailers that act as cozy homes away from home for those weekend fishing trips and summertime camping holidays. e. I'm not sure about the full load current calculation as well. 25 TRANSFORMER FAULT CURRENT Calculating the Short Circuit Current when there is a Transformer in the circuit. 20 Induction motor above 600V 0. Locked Rotor Current is a good approximation of the short circuit current that a motor will add to a short circuit on the power system. Current. The motor can be run up to the maximum speed, which can be up to 150% of the rated speed, but the torque starts dropping. 8 , Overload Relay of Starter is Put before Motor. Inrush current A transient condition, generally lasting 100 milliseconds or more that occurs during motor start-up. An inductive spike is the spike that occurs when voltage is quickly switched between windings. However, there are other solutions to the problem: Current transformer-operated overload relays ZW7 The ZW7 consists of three special To do this test it is necessary to measure the acceleration of the motor rotor and the acceleration torque of the motor rotor. we start a motor at reduced voltage. As the current increases, the resistive element heats up. B, O/L of DOL Starter Calculate Size of each Part of DOL starter for The System Voltage 415V ,5HP Three Phase House hold Application Induction Motor ,Code A, Motor efficiency 80%,Motor RPM 750 ,Power Factor 0. P @ 460V Legend: Motor Start Overload Relay Motor Damage 12 AWG Wire Damage Thermal Withstand Limit Contactor Breaking Current Contactor Withstand 30I e 2 The Importance Of Starting Time Lies In Determining The Duration Of Large Current, Which Flows During The Starting Of An Induction Motor. The Full-Load Currents of Motors. , the. 32(C). This way, the motor is adjusted to the machine’s load behavior. Then you can offer the client a smaller sized generator which would be more cost effective and better for the generator. Depends on the application, the motor has to get up to it's running speed driving whatever mass it's attached too so you'd have to use a tach on the motor and time out long it takes after power up till it's at it's running RPM. LPJ_SP, TCF, and LP-CC fuses are sized a little larger but are even more current limiting, providing an even greater degree of short circuit protection for the motor circuit. The following cycle is used  It is assumed in this calculation that during motor starting, the initial source emf  draws high current when started at full voltage. See our other Electronics Calculators. Motors of higher speed usually take a lower current than that shown in the table; while motors of lower speed usually take higher current. When a motor is started on normal utility power, the high inrush current will cause only a small voltage dip because • Motor-starting current. Whether its a 3-phase or single phase voltage supply. The relay labeled “CR1” is a much smaller “control relay,” and its turn-on time is controlled by the charging of an electrolytic capacitor. Re: starting current of motor through VFD 05/17/2014 12:47 PM Of all types of ways to start an AC induction motor, ONLY a VFD can possibly do so without exceeding the motor full load amps, as long as you have all the time in the world to accelerate it, and your load does not require 100% of the motor torque as load torque. Operationally you Start Characteristics . But my concern is: Will the motor drive more than 270A at start-up or will the VFD take care of that? Because Im afraid to damage the surrounding system with too high currents. The term Locked rotor current usually used in blocked rotor condition. The start-up energy of the motor is found either in its documentation or written on the motor itself. During start up, the current rises 6 to 8 times higher than the motors full-load or running current. Motor Wire Size Calculator Motor Startup Amperes (LRA) The Motor Startup Amperes module computes the approximate locked-rotor amperes (LRA) of an electric motor during its startup (motor start windings predominate) with the motor's nameplate letter code per NEC® Table 430. We created new PrusaPrinters website for all Prusa and RepRap fans. Use an overload relay which can word up to 12 amps. A quick test of the starter capacitor itself can indicate that it is faulty as we detail here. s Imotor/FLA = normalized motor stator current The actual time to trip will typically be less than shown in figure 2 based on the Thermal Capacity used when the overload occurs. For a 5. 1 hp = 0. If you take your FLA multiply it by 1. We also . This may cause severe damage. Starting of DC Motor. This causes a high inrush current. Roman Black - April 2004 - web Aug 2006 What is it? This simple circuit detects when the motor (or other device) draws too much current and activates a digital output. 27. The fuse sizing in "Optimal Branch Circuit Protection" for LPS-RK_SP, LPN-RK_SP, FRS-R and FRN-R fuses provides a degree of motor and circuit overload protection to back-up the normal motor overload protective device. When a Capacitor Start Induction Run (CSIR) motor is running and up to speed, what is the total capacitance acting on the motor? This reduces start-up current but also reduces start-up motor torque. The problem is we haven’t yet built the robot so testing it in this manner is not an option; we need to calculate the force (and hence motor torque) required to move the robot before we build anything. controller, and frequency counter. A frequent problem has been failure to start when the motor coupled to its load is energized for the first time. A 115V source should measure between 115 and 125V and a 230V source should measure between 230 and 240V. They can require up to three times their rated running wattage to start. If a motor is too small for an application it may not have sufficient torque to start the load and run it up to the correct speed. The start-up current can be as high as five to eight times the Knowing voltage drop during starting conditions for given motor details and hence deciding the key parameter during design (say max allowable starting current) Deciding the cable size / number of runs etc. There are two common types of motor capacitors, run capacitors and start capacitors. It also computes the running kilowatt and kilovolt amper Capacitor Start Induction Motor A Capacitor Start Motors are a single phase Induction Motor that employs a capacitor in the auxiliary winding circuit to produce a greater phase difference between the current in the main and the auxiliary windings. Motor start capacitors are used during the motor startup phase and are disconnected from the circuit once the rotor reaches a predetermined speed, which is usually about 75% of the maximum speed for that motor type. It comes out of the circuit as soon as the motor comes up to speed. O. I calculated the full load current by dividing the power by the voltage (p=VI). That said you've got start up to consider. Therefore different starting of induction motor, methods such as (star delta starter, auto transformer starter and ot Divide the start-up energy requirement, in joules, of the motor by "x" to arrive at the capacitor size needed in farads. motor run-up takes 30 s and triple overcurrent is required. My values are based on a 4pole Motor with a run up time no more  Mathematical calculation of the run-up data. C. The measured rise time is 12 ms, slightly The relay labeled “M1” is a large “contactor” designed to shunt the motor’s current around the start-up resistor. Remember that motor that was too big to start on the test panel? You simply brought it up to speed at a fraction of rated voltage. To calculate starting kilovolt-amperes (SkVA) and starting kilowatts (SkW) for  6 Sep 2011 Hello, I am having problem on how to determining the statup/inrush current of a 7. Home / Technical Articles / Calculation of motor starting time as first approximation Motor starting operations The problems connected to motor starting operations are fundamentally linked to the type of motor which a determined motor operational torque “C M ” offers, to the starting modality and to the connected load which has a determined The figure below illustrates what happens during motor starting. Motor nameplates generally will show starting watts, some as high as nine times the running wattage. If a motor is too large for an application then money has been wasted in Maximum Starting Current The Starting Code Letter on the nameplate of an AC induction motor can be used to estimate the maximum starting current of the motor. Whenever the motor is “fed” with just single This supply current in case of the shunt wound DC motor is split up into 2 parts. The starting of DC motor is somewhat different from the starting of all other types of electrical motors. 7A. Starting Current, sometimes abbreviated as I start in electrical engineering, is a measure or rating of how much current required for a single or three phase AC motor to get started. After the first half-cycle the motor begins to rotate and the starting current subsides to 4 to 8 times the normal current for several seconds. Now first see the image and after that we start doing current calculation of 3 phase motor. Flipped the switch & the pump started like it should. Abstract This paper discusses the fundamentals of a motor thermal model and its mathematical interpretation and physics for the different stages of motor operation. Use the motor nameplate current rating when selecting devices intended to protect motors, motor control apparatus, and motor branch-circuit conductors against excessive heating due to motor overloads and failure to start [430. The start capacitor gives the motor a boost on startup. curve and the motor torque curve. 00033 joules, you obtain 0. FLA is usually determined in laboratory tests. It is linear and is used to calculate the no-load current and the current with the rotor stationary (start-up current). motor. Two operation modes are available: the definite time mode (I&t) or the I s 2 x t s mode. The transformer steps up the current making it greater than the line current input during startup. Watch Voltage Dip. The magnitude of the Locked rotor current is determined by motor horsepower and design characteristics. It would take a instant draw of 10,000amps to trip a breaker. Note that these measurements are representative only for the specific models shown and under the particular test conditions. Stepper motors are normally used for positioning, and are not known for their speed. This goes for any printer using modular Pololu style stepper drivers. This difference is  25 Sep 2019 Motor Current Charts - AC Motors - full load current tables (1450rpm approx. Electric power consumption is rated power divided by motor efficiency. 5 V Owing to the additional current taken by the motor when starting, the voltage drop at the distribution board will exceed 10 Volts. For a DC source the calculation is simply the voltage times the current: W = V x A. Applications that have frequent starts The fan blade and motor have to get up to rotational speed before normal load is on it, but load is less when the blades aren't moving air so start up isn't that much extra. With everything from interesting interviews, guides and forums. If the motors are all started together select “Staggered start = No". Synchronous motor 6 pole 0. FLA - "Full Load Amps" - amount of current drawn when full-load torque and horsepower is reached for the motor. Starting current for a Full Voltage Start motor is typically from 4 to 9 times the running current (FLA - full load amperage). For such detailed duty cycles it is sometimes more convenient to calculate on the basis of torque. Then set your relay amps on 9 amps. Received it today, as expected, took about 2 minutes to make swap. A service technician can test for a failing motor by measuring the current draw in amps during start and run, and by comparing the result to information on the motor's data tag. Thermal calculations can demonstrate that, as these events last a short time, 6 A devices can be used without any heat sink. It contained 2 poles per phase for a total of six. Potential relays have four ratings; (1) continuous coil voltage, (2) minimum pick-up voltage, (3) maximum pick-up voltage, and (4) drop out voltage. This can be a very high current, approaching the classic volts/resistance of the motor, but generally considered to be 6 times the FLA, or full load amps. For most NEMA14 motors, the current maximum is 1A, but this will generally cause it to get warm, so a setting of 750mA is recommended. Thus reducing the start/stall current and changing the torque constant. Clutches are ideal to use with an AC motor when you want precise control over torque or to slowly apply the power. As you'd expect, the more strain on the motor, the more current it will draw in order to move; the stall current and free current are the maximum and minimum, respectively. Because the conductor resistance is so low, the motor will have a very large inrush current (see Figure above). View the Full (Updated) White Paper Now. 8 amp through 1,000 amp. In order to compensate the load increase, the voltage of the electrical system decreases. Electronics Calculators Index. The name capacitor starts itself shows that the motor uses a capacitor for the purpose of the Motor Ratings An electric motor’s nameplate or rated power is its output power, not its electric input power. motor’s service factor amperage for the operating voltage selected. Overload units Devices in motor start control units, such as heater coils, overload trips, thermals, etc. 21 Jan 2018 Starting current for a Full Voltage Start motor is typically from 4 to 9 times the if loading is allowed at start up the current drawn by the motor can potentially how to calculate the information (line and starting currents, from nameplate details). In Figure 2, we saw the cross section of a 3 phase, 2 pole motor. Another start/stop is per-mitted, followed by a 15 minute wait and then a final start. Tips: per unit voltage: this setting allows for reduced voltage starting scenarios. Hp electric motor therefore will require 3-4kVA for start up. Torque requirements for a electric motor calculator. 5A static, does it "spike" when the voltage is applied at startup? This means the motor load is split between 2 contactors but the overload only sees the current carried by one. This difference is credited to the fact that a DC motor unlike other types of motor has a very high starting current that has the potential of damaging the internal circuit of the DC motor if not restricted to some limited value. 1 D. 0 or less, the motor is not overloaded. Motor controls may therefore use a sinusoidal current drive in preference to the traditional rectangular/square current drive given that overall system implementation cost should be analogous with the complexity of motor Motor Thermal Model Protection Applications 41 1. To calculate the full load current (FLC) with the rated power, voltage and phases use the following formula if it is DC; A= KW X 1000/E; A motor capacitor, such as a start capacitor or run capacitor (including a dual run capacitor) is an electrical capacitor that alters the current to one or more windings of a single phase AC induction motor to create a rotating magnetic field. 6, the motor is receiving voltage through the second of the three taps. 58 of the line voltage Thermal/Magnetic motor circuit breaker upstream of the 3 motor Contactors does remove the confusion involved in setting overloads Note 3 contactors you show you are intending to have 4 The subsequent, easy-rolling motion equals the steady-state current flow that occurs in a motor once its gears and rotors have been jolted out of inertia and into motion. The proposed system is intended to offer soft start of the single phase induction motor using a PWM sinusoidal voltage while starting the motor. motor draws high current when started at full voltage. When a short occurs, the motor acts like an induction generator and delivers current to the fault until the energy stored in the motor's magnetic field and spinning rotor is dissipated. If you cannot get an exact size match to the original motor capacitor, it is acceptable to use a capacitor rated one step higher in µF. Soft starters are more expensive than DOL or star-delta, but they are widely used due to their convenience and simplicity. Typical motor starting characteristics are shown in Curve 1. After a little research and reading reviews, I decided this capacitor might replace my current run capacitor. This is because the start winding in these motors is only used for starting the motor. The basic procedure is to measure the start-up and running current for any motor while it’s connected to a load. Motor start and motor run capacitors Start capacitors. parts for this locked-rotor condition where the motor continuously requires a large value of inrush current. When the starting time is prolonged enough to exceed the permissible locked rotor time, the relay can operate getcalc. Plenty Of Methods Have Been Discovered To Start Motor In A Quick Time, But Due To Un-Economic Nature, Use Are Use a motor generator set. Notes: The motor full load current calculator calculates the motor full. Hence, building up the back emf slowly causing the level of high starting current maintained for quite some time. But how could I calculate the start up current of an IEC standard motor? Seems I has to gather a Torque-speed curve from the supplier, right? Also, in case it is not provided, how can I estimate the starting current and how to protect my motor to burn (since the starting current is 3 times more Simple Soft-Start Circuitry Provides Long Startup Times. Eaton’s reduced voltage Soft Starters are compact, multi-functional, easy to install, and easy to program. MOTOR FORMULAS AND CALCULATIONS: The formulas and calculations which appear below should be used for estimating purposes only. AC motor starting & running current calculator & formula - to calculate starting, required for an AC induction motor to run freely with no-load after starting up. 1 which equals 5. A start calculation is performed in order to analyse the reduced current start for all pump installations. Rated power depends on class of motor (which considers intended duty). The settings include: start-up current Is and start-up time ts. The difference between start current and run current on 3-phase motor is about 300 percent over motor full load amps. When the motor picks up the speed, about 80 percent of its rated speed, the switch S is immediately put into the RUN position. Depend on the type and duty of the motor as many same horsepower motors will Application: the capacitors described in the current catalogue are specifically designed for the start and the run of single-phase electric motors. 5 A Notes: The motor full load current calculator calculates the motor full load current from the following parameters: Voltage (V). a. It requires at least a few amps of current through its coil to energize. This calculator is only a preliminary estimation to indicate the lowest start current which can be achieved with our starter. 2) No-load speed increases by 20% ( x 1. Lets take a look at the motor stator that utilizes this power source. A Very Simple Method To Calculate The Starting Time Of Motor Is Proposed In This Paper. Overload relays can be set up to withstand temporary work  FOR CALCULATING RERATED CURRENT AT VARIOUS LOADS Closing the switch contact on a motor start-up load causes very large current surges of  3. Enter the rated volts, amps, power, and efficiency to find the current flowing through the motor. Motor Starting Torque (Peak Stall Torque) and Motor Types July 7, 2014 · by Ted Dillard · in Motors . The highest current appears at start-up and can reach up to 4 times the steady state current. Single Phase Motors Figure 4 shows a single phase sine wave. Starting current of the motor,Short circuit current of the motor lower current than that shown in the table; while motors of lower speed usually take higher current. The voltage soft start feature ensures the output ramps up in a controlled manner, with controlled dv/dt. Full load current from NEC table 430-148, I = 12 amp. Compare the reading to documented or nameplate specifications. Section 695-7 – No. Full-Load Amps: Three-Phase Chart and the Motor Wire Size Calculator. CM = Wire size, Chapter 9, Table 8 start-up supervi-sion unit The settings for the start-up supervision unit are found in the Start-up supervision unit section in the relay setting window (Fig. So the next thing what is amps of relay for your motor. Excess current causes heat, which must be dissipated. They use an external voltage regulator that senses the output voltage. Motor controller terminals. Motor start time There are many variables that will govern the run up time of the motor. GET-8424: Calculations from a Siemens Motor Start/Stop Profile 2 GE Power Management HOT STARTING The stopped profile shows that the motor has been running a rated load and stopped, after which a start/stop is allowed followed by a 15 minute wait. General guidelines with calculations provided will be very helpful. The voltage across both windings remains the same. Multiple motors started at the same time may be summed and treated as one motor. From there we can write First start by converting kilowatts to watts, which can be done by multiplying the power in kW by 1,000 to get the number of watts. full load current. Sudhir Barman 9800062654. sequence and a precise output voltage soft start feature. 3-φ motor runs from 1-φ power but Motor Starter Protection Graphic Explanation. that protect the motor while its running. Every transformer has “ %” impedance value stamped on the nameplate. These are the bottom of the well up to the wellhead will always be the is enough to calculate graphically the average torque, i. Inrush Current Calculator – Single and Three Phase About us Since 1994, Ametherm has provided the most reliable and effective inrush current limiting solutions available. 2 / Sizing Gensets for Motor Starting BASIC CHARACTERISTICS OF MOTOR LOADS Motor loads cause difficulty because a motor draws high current when started at full voltage. The power running through a motor depends on more than its voltage and current. A rule of thumb for a motor is the start up current is 5 times the full load current. A squirrel cage induction motor must sense two or more electric phases to cause the magnetic field to start spinning, thus turning the motor’s rotor and shaft. CM = (1. START UP Single Phase Motors Before starting the motor, use a voltmeter to measure the source voltage and ensure that it is within normal tolerances. 745 kW; Related Mobile Apps from The How to calculate the Starting current of an induction motor if I have the power in kilo watts and the voltage? I have looked up formulas , but I got confused. The laboring of a motor is it's normal rated capacity. Note: This level of protection requires a well-designed, true dual-element fuse. One minor difference is that the ECM motor has a “soft start” feature which means the motor spins up to speed slightly slower than a traditional PSC motor, however it does this without the noise or power surge that is often common for motor start up. A soft starter is an electronic device which regulates the voltage flowing to the motor at startup. Expected voltage sag and voltage drop are calculated for "across-the-line motor starts" based on system impedance data and motor nameplate ratings. of Design D motors handles the very high-inertia loads with lower starting current, minimizing heat buildup in the motor during start. Is initial amp draw higher on startup for an electric motor? Does an motor draw more amps on startup than when it is turning at whatever rpm the voltage dictates? For example, if a motor/prop combination draws 8. How to Convert Amps to Horsepower. torque and available motor torque during start-up is. three times their nominal current to cover inrush peaks from the electrical motor,  An example of an electric motor inrush current is shown in Figure 1. As the voltage dips at motor start-up, the regulator increases the output voltage of the generator. 2) Output power increases by 44% ( x 1. Motor Voltage Drop In Feeder Conductors Motor 2HP, 230V, 1 Phase, code letter J, capacitor start, conductor length = 300 ft. Electronic motor starters and drives Drives engineering basic information Eaton Wiring Manual 06/11 2-7 22 Direct Motor start ① Voltage curve • Mains load high Current curve • Relative startup current 4 to 8 x Ie (depending on motor) Torque behaviour • Relative startup torque 1. However, it will not self-start. The use of start-delta starter, static soft start unit or variable speed drive allows to reduce the value of the starting current (Example: 4 In instead of 7. The AC Motor clutch can also be used to ramp up the speed of a high inertia load. B) Capacitor Start, Induction Run (CSIR) 7. Respective AC contactor pick-up (by standard)  Generator Size to Start Motors Direct On Line or Star Delta) and press Calculate. Motor nameplate current rating. I recently facing difficulty to do sizing of my DOL motor. The motor torque versus speed curve, the load torque versus speed curve, and the current versus speed curve are utilized along with the Starting Current in Induction Motor: Starting current of induction motor is as high as 5 to 7 times the normal full load current. Hi, I am new calculator. 31]. It is the responsibility of the customer to specify the required motor Hp, Torque and accelerating time for his application. the charge current for the soft-start Calculate Size of Contactor, Fuse, C. 4. The 3 phase Induction motor is popular for its efficiency and is widely employed in the electric systems for doing […] However, this assumption is not applicable for motor start-up calculations where the fault level is used as an input to the motor start-up calculation. To learn more about how you can help Engineers Edge remain a free resource and not see advertising or this message, please visit Membership. A normal value is between 6 to 7 times the rated motor current but values of up to 9 or 10 times the rated current exist. This calculator will also give you motor amps and recommended breaker size, starter size, heater size and conduit size. We all know that motors draw a high inrush current during starting:typically . Normally it will be 6 to 7 times of the Motor full Load current. 1. This avoids the over-torque and over-current conditions that happen when across-the-line circuits are completed, like when a basic motor control contactor closes. AC Motor fans are used to cool down the motors. Although high efficiency motors can be found on the market, in practice their starting currents are roughly the same as some of standard motors. with start-up, followed by The capacitor size for an AC motor is calculated base on the amount of current required to start the motor. 4 Three-Phase Motor Starting Current Limitation 20. The compressors I'm looking at all all rated 19-22 amps and the generator will mainly be powering the compressor, so it only needs to have enough power for this purpose. Different conditions can alter both the current values and starting times. 5). Time Current Curves Motor Protection Refer to NEC Article 430. motor start up current calculator

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