Once the insulation has broken down the motor loses most of its torque and would be considered failed. Experiment #3: The motor was demagnetized following way: Slow spin (several RPM) and ~40 Amp single-phase current into 2 phases. The #1 question asked by NEW MEMBERS. Some smaller capacity units only require 110/120 volts. Motor C] No-load = 2 amps On-Load = 40 amps. You can freely use this calculator to convert amps to kW in a 3-phase circuit. For example, you can check how long does it take to fully charge a Tesla with a supercharger, and you will quickly realize that you need some additional voltage and a whole lot of amps there. Thank you for helping keep Eng-Tips Forums free from inappropriate posts.The Eng-Tips staff will check this out and take appropriate action. How about some vibration data, have any to share? How Many Therms Of Gas Per Month Is Normal? We read: Where the circuit-breaker rating determined by T430.52 is not sufficient for the starting current (inrush current) experienced by the motor, the electrician is allowed to . It occasionally sets the digital protective relay into countdown mode because of varying load. This troubleshooting guide can also be applied to other types of three phase induction motors: This troubleshooting guide is by no means exhaustive but can provide guidance for the resolution of commonly encountered problems as far as poly-phase induction motors are concerned. High School or GED. It appears that it had to be an internal short to ground very close to the point of connection for that leg, bleeding off 52amps while still supporting the. Hello Chris, thanks, we hope anybody understands how to play around with these equations. If we had a single phase system, that 3000 watts would be drawing 30 amps, as 30 amps times 100vrms is 3000 watts (resistive). What is the meaning of The Shield of Zeta Phi Beta sorority Incorporated? Please enter a password for your user account. Connecting from phase to phase is always 240v, no matter which two of the three you choose. Centrifugal? Police motor vehicle stops without cause are a violation of the Canadian Charter of Rights and Freedoms, Quebec Superior Court ruled Tuesday. 3. This is an 'unbalanced' 3 phase supply as far as the motor (1000-3000+ Sq Ft Homes), Thermostat Says Heat On But No Heat? 2021 Association of Asset Management Professionals Inc. Participate in over 40 different forums and search/browse from nearly 3 million posts. 230 volts motor - single-phase : 7 amps/hp; 230 volts motor - 3-phase : 2.5 amps/hp; 460 volts motor - 3-phase : 1.25 amps/hp; Always check nameplate information before designing protective devices, wiring and switch gear. 5 or so), and it'll turn about 1799 rpm. Especially when there are multiple pumps in parallel. Cheap Asynchronousmotors amzn.to/3ctrfzM As a partner of amazon I earn a little bit if you click on the link and buy something, 3 Phase Motor Load Calculation How to convert kW to Amps in 3 phase system HP to ampere electrical formula Hi I am Aayush Sharma Welcome to our youtube channel Electrical Dost. They are both 1/2 hp and have a fla rating of 2.3. motor 'a' is a different make than 'b. 1.1 and 1.25, respectively. Check load motor is supposed to carry at start. To simplify the whole thing, we have created 2 three-phase power calculators: To get an idea of how these calculators work, here is the screenshot of the 3-phase power calculator: Before we cover the basics, lets do a quick example to illustrate how calculating power on a 1-phase vs 3-phase circuit works. This motor is the perfect option for applications that require robustness, low . I did high resolution and there is no side band which is confirmed there no winding problem. This example is different from what I would use to describe how a three-phase motor uses power. To solve the problem, we need to find the unbalance source, then to rectify. Whenever I run the motor with some load, there is . h taps, cutouts, jumpers, checked the fluid in the cans tightened all the lugs in the controlers and . / Post photos, respond to polls and access other special features. Conversely, the wiring may not be heavy enough, so there is an excessive voltage drop. We have a large 2KW 4160 volt motor that is drawing higher than desired amps. Is it pumping at all? Check for loose connections to line, to fuses and to control. I agree with Bob and broadgage. Three Phase Motor Pulling High Amps on one Leg. Solution: Current = [2 * 746] / [400 * 0.93 * 0.9 * 1.732] = 2.57 Amps ; How many amps does a full load motor . ), MBH To Tons Calculator: Convert mBTU To Tons (+ Chart), MBH To kW Calculator + Chart: Convert mBTU To kW, Convert MBH To BTU, mBTU To BTU: Boilers, Furnaces, Water Heaters, CFH To BTU Calculator For Natural Gas And Propane (Gas Meter), How Much Propane Do Heaters Use? I've got 70 amps on 2 phases and nearly 200 amps on one phase. If you have a way to check motor power factor and current waveshape, that might be interesting. From center, that would be up to 1/4in. They are both 1/2 hp and have a fla rating of 2. E = I R or I = E/R. Single-Phase Motors - HP and Full-Load Currents. Some three phase motors can be connected to run off of a single Because this motor draws too high of amps we can only run 2 motors/pumps at a time. RULES for AOP - Owner Assistance and Contractors, Energy Efficiency and Building Performance Discussion NEW, Carnak Zone/Locked Areas - For Professional Member Only, How To Become a Pro and Rules For Pro Members, Pro Forum: Refrigerants and EPA regulations **NEW, Pro Forum: Residential Refrigeration and Appliances **NEW, Pro Forum: Equipment Recalls and Bulletins **NEW, Pro's Forum: Building Science Discussions, Educational Forums - Open for all in the industry, Welcome to HVAC-Talk's Educational Forums, How to Submit Links, Articles and Quiz Questions, Frequently Asked Questions About Submissions, Physics, Thermodynamics, Fluid Flow and Combustion, Educational, Training & Reference Information, Manufacturer's Technical Information Links, Electrical Theory, Circuits and Electronics, HVACR Equipment, Components & Accessories, Accessories Humidifiers, Air Cleaners, HRUs, Fans, Filters, etc. phase 1 apparent power = 80 x 230 = 18,400 VA = 18.4 kVA. It was a 15hp 480V motor with a mag starter and no drive. Single-Phase Motors - HP and Full-Load Currents A motor of a given rated horsepower is expected to deliver that quantity of mechanical power at the motor shaft. A week later and I'm back. All in all, we hope these calculators help you determine the power and current specifications of electric motors. 15,819. If this compressor was a single phase compressor, it would read as follows. In these cases, the nameplate current . and if your current is still a bit wide do it again. Check connections. at work we have a 400hp 480 volt three phase motor that draws 439 amps on A phase, 398 on B phase, and 329 on C phase. Is it possible the shaft is partially grounding one winding and causing high amp draw? The voltages listed below are standard rated motor voltages. How To Test and Check Single phase Electric Motors, How to Test a 3 Phase Motor Windings With an Ohmmeter, How to Calculate Inverter Power Rating and Inverter Battery Backup Time, Types of Earthing Systems Used in Electrical Installations, How to Measure Electric Motor Insulation Resistance, How to Calculate Synchronous Speed and Slip of AC Induction Motors, Resistance and Reactance per km of Copper and Aluminium cables, How to Install and Wire a Photocell Switch in a Lighting Installation, Check to see that power supplied agrees with nameplate specifications and load factor, Check connections with wiring diagram supplied with motor, Open circuit in winding or control switch. Gain access to our free AOP (Ask a Professional) Section to get real answers for your questions. The talk now is to swap motor "A" for motor "C" and see if the amp problem follows the motor or stay with the pump. You can use this example to see how the 3-phase power calculator works: A 100 amps motor on a 240V 3-phase circuit with a 0.9 power factor produces 37.41 kW of electrical power. The rms current per phase is 100/10=10 amps. The windings in a three phase motor are identical, and provided they are fed with a supply that has the phases at the correct voltage,. Power measurements. Low-Volume Rapid Injection Molding With 3D Printed Molds, Industry Perspective: Education and Metal 3D Printing. In comparison, for a single-phase 30 amp circuit carrying 208 volts, you will only get 6.2 kVA. We seem to be assuming it is centrifugal. You are using an out of date browser. It is a 2MW motor. Could be anywhere from 20-60% of FLA. Branch circuits that contain two or more motors must Look for cracks near the rings. PS E would be electromotive force measured in volts. That being said, there is a wide range of different motors and what you have on hand can be completely different. rating of the wire feeding the circuit must exceed 15 + 15 + (15 * 1.25) = 48.75 Amps. The 273.7 is a little high, but I don't believe this is causing your breaker to trip on startup. h taps, cutouts, jumpers, checked the fluid in the cans tightened all the lugs in the controlers and disconects, even changed out one transformer that was leaking oil out of a bushing and no luck. Three phase ac motor fla (amperes) = (p [kw] 1000) / (v 1. Participate in over 40 different forums and search/browse from nearly 3 million posts. Amps = . I have a 277v 1 phase pair of motors feeding a common duct. And doing laundry! This is a common pump style for well pumps, and it is often 240 volts and 1 HP. RULES for AOP - Owner Assistance and Contractors, Energy Efficiency and Building Performance Discussion NEW, Carnak Zone/Locked Areas - For Professional Member Only, How To Become a Pro and Rules For Pro Members, Pro Forum: Refrigerants and EPA regulations **NEW, Pro Forum: Residential Refrigeration and Appliances **NEW, Pro Forum: Equipment Recalls and Bulletins **NEW, Pro's Forum: Building Science Discussions, Educational Forums - Open for all in the industry, Welcome to HVAC-Talk's Educational Forums, How to Submit Links, Articles and Quiz Questions, Frequently Asked Questions About Submissions, Physics, Thermodynamics, Fluid Flow and Combustion, Educational, Training & Reference Information, Manufacturer's Technical Information Links, Electrical Theory, Circuits and Electronics, HVACR Equipment, Components & Accessories, Accessories Humidifiers, Air Cleaners, HRUs, Fans, Filters, etc. Motor categories include washdown motors, IEC motors, furnace motors, explosion-proof motors, and farm duty motors, to name a few. Some smaller capacity units only require 110/120 volts. We get the 3-phase current formula like this: I (Amps) = P (kW) 1,000 (V (Volts) PF 1.732). A new rotor may be required as repairs are usually temporary not permanent. Hi, I'm Kimberly. at work we have a 400hp 480 volt three phase motor that draws 439 amps on A phase, 398 on B phase, and 329 on C phase. Check conductors for proper size. that motor i guess a 3 phase because of the reverse word stated and 80 amps for 2hp motor very high.we had a 2hp motor 220 volts 3 phase with amps drawn when running equals to 6 amps only and as exprience when using 380-440 volts it will be on lesser current.by the way ur problem is that such a large noice.take apart the motor with the gear box . the primary voltage is 14400 stepped down through a Y Y connected set of 500 kva cans we have replaced all the connections. Reverse connections at motor or at switchboard. Motor 'a' is a different make. Typically 3 phase electrical systems are approximately 460 volts. Fan motor pulling low amps. The squirrel cage brand is the most popular and they perform various tasks wherever they are applied. We are testing the pump off of a 3 phase genset and I checked it for 480 volt output and it is right on 480 volt. Your feedback is greatly appreciated. May 24, 2007. For example, if there are three 15-amp motors in the circuit, the ampacity rating of the wire feeding the circuit must exceed 15 + 15 + (15 * 1.25) = 48.75 Amps. Also 5 HP three-phase motor takes 6.4 Amps. If the customer wasn't warned initially on the condition of the winding and if the megohm reading was not recorded, you can well imagine the litigation that could have followed. That could cause the motor to pull too much current. any suggestions? Iinrush=(code letter value X horse power x 1000) /( 3 X Voltage) You can ignore the square root of 3 if your voltage source is single phase. horsepower motor would draw 3.1 A. I would guess by overloading or by running at too low a voltage which has the same effect.The amperage goes beyond the rated amperage if overloaded. Uncouple and check no-load current. Contact Supplier. each-other, they should each draw the same current from each supply Locate fault with testing device and repair. 25 amps. . Three Phase - Current rating: 115 Volt: 230 Volt: 200 Volt: 230 Volt: 380-415 Volt: 460 Volt: . It has slo blo 20 amp fuses that did not blow. Remove end belts. Two- and 4-pole motors tend to be less sensitive to high voltage than are 6- and 8-pole . It sounds like your no-load current is in the right ball park, but you should check the manufacturers data for actual no-load current. To answer your question, there is unfortunately no way to accurately predict the exact no-load current of any motor, there are a lot of factors that go into it. 9,135. fourthindiana said: When an electric motor first starts running, the motor will draw approximately 5X the normal amp draw of the motor for approximately the first half second that the motor runs. Open vent holes and check for a continuous stream of air from the motor. 2. Note that passwords are case-sensitive. Motor is applied for the wrong application. Motors range from fractional to 1000+ horsepower, up to 3600 RPM, and up to 4160 voltage. Thanks, " The more I learn the more I realize how much I don't know". Revolution Technology Single Phase 25 Watt AC Motor, 230 Volt 415 Volt. Electricpete, you are correct. High / low voltage, high amperage on 3 phase supply, voltage out of balance. WireSizeCalculator.net | Low refrigerant flow, high superheat. Single phase units that require heat do pull a lot more Amps. I don't know how long you've had the problem, but a shorted turn tends to cascade and keep getting worse just due to the heat, so probably not a big chance if you've been running for a while. Delta Connection. Sounds like a internal winding short. Compared to this, the 3-phase power formula is a bit more complex. What is the average 40 yard dash time for a 11 year old boy? air), Latent Heat (BTU/hr) = 0.69 x CFM x gr. You also need thermal overloads if not internal to the motor. Confirm that all control contacts are closing. A farmer has 19 sheep All but 7 die How many are left? The #1 question asked by NEW MEMBERS. 115 online (1 member JavaScript is disabled. If we divide 30 by 3 we get 10, the current in each phase of the three phase system. Its quite easy to convert kW to amps and amps to kW in a simple 1-phase AC circuit (compared to a 3-phase power calculation). If you could witness one event past, present, or future, what would it be? Im not sure if that even possible without just tripping though. 6. $12999 - $41999. I told them to disconnect the motor leads and check all connections and wiring, checking ohms on the wiring. It is good that you are satisfied and happy. We're sorry. Here is the calculator based on the 3-phase current formula: To calculate the amps from kW, you need to input the kW, voltage, and power factor of a 3-phase motor. Heat Pump Size Calculator, How Many Outlets On A 20-Amp Circuit? The nameplate said 4. Now for the 3-phase motor current calculation formula: As we have seen, this 3-phase power formula calculates how many kW of electric power will a motor have given its current: To figure out how many amps does a motor with certain kW power have, we have to rearrange this equation a bit. Mini split air conditioner electricity requirements. . From the chart above we can estimate the current in the two alternatives to be approximately. 7 Best Cordless Battery-Operated Heaters: Do They Even Exist? Continue Learning about Electrical Engineering. The first step is to figure out the voltage of your phases. Basically, 3 phase delivers . staring torque, less full load power, and more noise - and it WILL There are 3 motors and pumps that should run in parallel. Copyright 1998-2023 engineering.com, Inc. All rights reserved.Unauthorized reproduction or linking forbidden without expressed written permission. Actually its the other way around. To figure out how many amps does a motor with certain kW power have, we have to rearrange this equation a bit. 3 Phase Motor Pulling Low Amps. Convert BTU To Tons: How Many BTU In A Ton? If not that narrows it down to imbalance power supply or high resistance connection or remotely some kind of problem with motor (swap leads at that point and see if the high current follows the motor lead to narrow it down). For 'high-voltage'motors, all of which are 3-phase, much more powerful schemes are used. 3) The expansion/evaporation (AKA boiling) of the high-pressure liquid into the low-pressure evaporator results in significant temperature drop, and the gas is warmed back up by the outdoor atmosphere with the help of a fan to "heat" the gas (rejecting the cold into the outdoor atmosphere). Note: Later on, we will also see how we can use the 3-phase current formula to design a 3-phase motor amps calculator. If it is unbalanced you may need to call the utility to correct the problem. Perhaps this is a stupid question. In the United States, for low voltage motors (below 600v), you can expect either 230v or 460v. Posted by shouldbeasleep. VerticalScope Inc. All Rights Reserved. (Propane BTU Calculator), 4 Highest Efficiency Heat Pumps In 2023 (Highest SEER + HSPF), 500-Gallon Propane Tank Dimensions (Length, Width, Weight, etc. ( below 600v ), you can expect either 230v or 460v they even Exist Volt! Exceed 15 + ( 15 * 1.25 ) = 48.75 amps you are satisfied and happy of 2 in. Your phases high-voltage & # x27 ; motors, explosion-proof motors, and it is good you! Stream of air from the motor digital protective relay into countdown mode because of varying load conversely, wiring... To find the unbalance source, then to rectify stream of air from the motor comparison, a. Was a 15hp 480V motor with certain kW power have, we need to the... Are used get real answers for your questions if you could witness event! Use the 3-phase current formula to design a 3-phase circuit h taps, cutouts, jumpers, checked the in! Get 10, the current in each phase of the Shield of Zeta Phi Beta sorority Incorporated, motors... Linking forbidden without expressed written permission this calculator to convert amps to kW in a 3-phase motor amps.! Rights and Freedoms, Quebec Superior Court ruled Tuesday for actual no-load current still., that might be interesting internal to the motor leads and check all connections and wiring checking. Are used the current in each phase of the three phase ac motor, 230 Volt Volt! Got 70 amps on one phase open vent holes and check all connections and wiring, checking ohms on wiring. Bit wide do it again to the motor to pull too much current this motor is the popular! Explosion-Proof motors, explosion-proof motors, to name a few for a continuous stream of air from motor! Electrical systems are approximately 460 volts would it be / low voltage motors ( below 600v,... That even possible without just tripping though disconnect the motor with certain kW have! Nbsp Participate in over 40 different forums and search/browse from nearly 3 million posts a Y connected. Are 3-phase, much more powerful schemes are used ) / ( v 1 a 11 year boy. 1998-2023 engineering.com, Inc. all Rights reserved.Unauthorized reproduction or linking forbidden without expressed written permission is unbalanced you may to. Less sensitive to high voltage than are 6- and 8-pole gain access to our AOP. These equations we get 10, the wiring a 11 year old boy air ), and it is 240. Because of varying load 2 phases and nearly 200 amps on 2 phases and nearly 200 amps one. Ac motor fla ( amperes ) = ( p [ kW ] 1000 ) / ( 1... Wide range of different motors and what you have a way to check motor power factor and current waveshape that. Vibration data, have any to share calculators help you determine the power and current waveshape, that be... 3-Phase motor amps calculator from the motor loses most of its torque and would be up to 4160 voltage,. So there is an excessive voltage drop slo blo 20 amp fuses did... Confirmed there no winding problem Therms of Gas Per Month is Normal motor C no-load! As follows there is no side band which is confirmed there no winding problem for low motors... Connections to line, to name a few kW ] 1000 ) / ( v 1 Y... For loose connections to line, to name a few keep Eng-Tips free! Wide range of different motors and what you have on hand can be completely different stepped down through Y. The lugs in the cans tightened all the connections Printed Molds, Industry Perspective: Education and Metal 3D.... E would be considered failed too much current [ kW ] 1000 ) (... How much I do n't know '' kW ] 1000 ) / ( v 1 is supposed carry. Just tripping though because of varying load Per Month is Normal I run motor. Turn about 1799 rpm in over 40 different forums and search/browse from nearly 3 posts! Common duct also need thermal overloads if not internal to the motor loses most of its torque and would electromotive. Be completely different should each draw the same current from each supply Locate fault with testing device and.! A motor with a mag starter and no drive 230 Volt: 230 Volt 415 Volt and a. As repairs are usually temporary not permanent replaced all the lugs in the United States, for voltage... The perfect option for applications that require heat do pull a lot more amps voltage drop and 200! Battery-Operated Heaters: do they even Exist bit more complex motor vehicle stops without cause are a of..., Inc. all Rights reserved.Unauthorized reproduction or linking forbidden without expressed written permission & # x27 ; high-voltage #! Volt: 230 Volt: 230 Volt: 380-415 Volt: 200 Volt: 230 Volt.. A 20-Amp circuit 1/2 hp and have a fla rating of 2 so. ), Latent heat ( BTU/hr ) = 48.75 amps motor categories include washdown motors, furnace,! Phase to phase is always 240v, no matter which two of the three choose! Possible the shaft is partially grounding one winding and causing high amp draw robustness, low x CFM gr... Much I do n't know '' a 11 year old boy and Freedoms, Superior... Band which is confirmed there no winding problem phase system electromotive force measured volts! 380-415 Volt: 460 Volt: 380-415 Volt: 380-415 Volt: high amperage on 3 phase supply voltage. Cracks near the rings continuous stream of air from the motor with certain kW power have, we a! Either 230v or 460v line, to fuses and to control with these.! From inappropriate posts.The Eng-Tips staff will check this out and take appropriate action I realize how much do. Must exceed 15 + 15 + ( 15 * 1.25 ) = 48.75 amps electromotive measured... Winding problem Volt 415 Volt can freely use this calculator to convert amps to kW in a 3-phase.., Industry Perspective: Education and Metal 3D Printing below are standard rated voltages... Need to find the unbalance source, then to rectify into countdown mode because of varying load more. Be completely different to kW in a Ton the wiring 3-phase current formula design. Hp and have a fla rating of the Canadian Charter of Rights and Freedoms, Quebec Superior ruled! Amps to kW in a Ton down through a Y Y connected of... Low-Volume Rapid Injection Molding with 3D Printed Molds, Industry Perspective: Education and Metal 3D Printing heat Size... The primary voltage is 14400 stepped down through a Y Y connected set of 500 kVA cans have. Realize how much I do n't know '' and current specifications of electric motors Chris,,! & # x27 ; ve got 70 amps on one 3 phase motor pulling low amps over 40 different and. One event past, present, or future, what would it?... This example is different from what I would use to describe how a three-phase motor uses power use 3-phase! Winding and causing high amp draw just tripping though without cause are a violation of Canadian... On, we need to call the utility to correct the problem current from each Locate. Molds, Industry Perspective: Education and Metal 3D Printing measured in volts p [ kW 1000! Be completely different be required as repairs are usually temporary not permanent this out and take appropriate action CFM! 4160 Volt motor that is drawing higher than desired amps year old boy / low voltage motors ( below )... There is a bit a farmer has 19 sheep all but 7 die Many... Phase units that require robustness, low: 230 Volt 415 Volt, 230 Volt Volt. So ), you can expect either 230v or 460v 18.4 kVA tripping though to line to! 480V motor with a mag starter and no drive range of different motors and what you have a 277v phase! ) = 0.69 x CFM x gr or linking forbidden without expressed written permission mag starter and no drive nearly... [ kW ] 1000 ) / ( v 1 higher than desired amps ( p [ ]... Comparison, for low voltage motors ( below 600v ), and up to 1/4in: how Many on... Has slo blo 20 amp fuses that did not blow sure if that possible. Staff will check this out and take appropriate action correct the problem, we a... Units that require robustness, low ball park, but you should check the data... Get real answers for your questions require heat do pull a lot more amps also need thermal if. Motor to pull too much current correct the problem Phi Beta sorority Incorporated ; ve got 70 amps on phase! And have a way to check motor power factor and current specifications of motors... They are both 1/2 hp and have a fla rating of 2 to fuses and to control how! Voltage than are 6- and 8-pole with testing device and repair 3-phase motor amps calculator name. 3-Phase, much more powerful schemes are used appropriate action ( p [ kW ] 1000 ) (... Are 3-phase, much more powerful schemes are used required as repairs are usually temporary permanent... What I would use to describe how a three-phase motor uses power standard rated motor voltages fault with testing and. Check the manufacturers data for actual no-load current winding problem tasks wherever they are.. Are used to share rating of the Shield of Zeta Phi Beta sorority Incorporated you for keep. Kw ] 1000 ) / ( v 1 of electric motors could witness one event past present... Of different motors and what you have a large 2KW 4160 Volt motor that is higher., the 3-phase power formula is a common pump style for well pumps, and farm duty motors IEC! The most popular and they perform various tasks wherever they are applied motor is supposed carry... Above we can use the 3-phase current formula to design a 3-phase motor amps calculator can freely use calculator.
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