This is an 'unbalanced' 3 phase supply as far as the motor Since both your flow rate and your discharge pressure are less than design, the current draw should be less than design. If it was a direct short, it wouldn't have ran as long as it did. 2021 Association of Asset Management Professionals Inc.    The status of the 3 similar rated 3-phase motors [16 KW, 27 amps, 440V] is as follows: Motor A] No-load = 14 amps On-Load = 37 amps. 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. If the current unbalance exceeds 10%, you must take action to avoid motor failure and further assets damage. You can't do that with an ammeter. U-frame motors are less sensitive to overvoltage than are T-frames. There are exceptions to this requirement, which would include interlocks of two or more motors to prevent them from running at the same time. In case of 3 phase 4 wire (3 phase + neutral) connection, the unbalance current will flow in the neutral wire. 4. This motor is the perfect option for applications that require robustness, low . Pe 10 kW For these motors, a motor . It would be helpful to know if there was a time in the past when the motor did not draw more current than the others. Fuses blown. Already a member? Privacy Policy     About this video- Dosto Aaj Ki Is Video Me Maine Aapko three phase motor load calculation Batane Ki Koshish Ki Hai Or Kuchh electrical tips jaise kW to HP convert, kw to ampere in hindi, circuit breaker selection, Electrical interview questions answers Share Kiya Hai Ummeed Hai Aapko Ye Video Bahut Pasand, How to check a 3 phase motor with a multimeter How to troubleshoot a 3 phase motor with a multimeter 3 Phase motor test How to check a 3 phase motor system How to check winding resistance on a 208-230/460 volt, 3 phase motor How to check resistance and short to ground for a 3 phase motor 3 phase motor troubleshooting How to check induction motor with multimeter Fluke 902 FC HVAC True-RMS Clamp Meter amzn.to/39wvwiK Milwaukee Cut 1 Dipped GLOVES L amzn.to/3s8H18O KNIPEX Tools Long Nose. I would be current flow . View wire size charts from the list below. Its not unusual for the utility to provide voltages that are slightly unbalanced. Is it pumping at all? In these cases, the nameplate current . all about convert horsepower to amps & to convert motor hp to amps. Watts have a direct relationship with volts, which can be expressed by the following mathematical formula: Watts = Voltage * Amps. HP 746. FREE delivery. That is pretty odd, how do we presumably change horsepower drawn and not change the 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. Check to make sure that all leads are well connected. Components Coils, Heaters, Motors, etc. If the amps that are recorded on the meter reflect that there is an excess than what is recommended by the motor manufacturer, then this is a sure sign that there is a mechanical overload, which must be reduced as soon as possible. Depends on the voltage. Check to curls of the motor engine of a 3 phase engine with just a multimeter and the connection between ground an the motor curls. In that case the motor will not start, but will pull locked rotor current until the circuit breaker trips. $12999 - $41999. As long as a motor's torque (i.e., rotational force) doesn't change, a motor's speed will have a one-to-one relationship with voltage. You also need thermal overloads if not internal to the motor. Flexible vane? I agree with comments to check vibration for pulsation at pole pass frequency(If present check current signature analysis). Say we need to find the amperage of 3-phase motor with a 0.95 power factor, efficiency of 80% (or 0.8), and runs on a 220-volt 5-kilowatt power source. Any thoughts? Because of the critical roles these motors play in any plant, a failure of the motor, inability to start, noisy operation and sundry other problems need to be remedied as soon as possible to avoid costly production downtime. Check to see if the three phase currents are balanced. Your feedback is greatly appreciated. Choose the combination with the smallest imbalance. ). When Kimberly is not scrapping, she is traveling, blog-hopping, reading, or editing photo shoots. Aug 31, 2010. I have a ton of nicknames.. but you can call me Aki. h taps, cutouts, jumpers, checked the fluid in the cans tightened all the lugs in the controlers and . 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. Do note that if a 3-phase motor with lower voltage and lower power factor will draw more amps to produce the same power output. Power measurements. Is it possible the shaft is partially grounding one winding and causing high amp draw? Consult motor manufacturer. Voltage from B to C: 273.7. Imbalance in current drawn by 3-phase induction motor. It has slo blo 20 amp fuses that did not blow. Revolution Technology. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features Press Copyright Contact us Creators . Wye or Star Connection. The voltages listed below are standard rated motor voltages. 460 volts motor - 3-phase : 1.25 amps/hp Always check nameplate information before designing protective devices, wiring and switch gear. What are your voltage readings phase-phase and phase to ground with motor off and motor running? For light and moderate motor loads. Fuses blown. Check for loose wiring connections. 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. Single-phase motors tend to be more sensitive to overvoltage than do 3-phase motors. and synchronous-type three-phase alternating-current motors. It was a 15hp 480V motor with a mag starter and no drive. Very often, I have to check out used motors before we put them back in service on other machines. If you increase the load on the motor then t. Open circuit. In general, the following applies for motors with an output of //. This is a common pump style for well pumps, and it is often 240 volts and 1 HP. This example is different from what I would use to describe how a three-phase motor uses power. (+ How Many Watts), Convert kVA To kW With Power Factor (+ Easy Calculator). NE (9.06 miles @5.9 Degrees from Winged Horses). Pe 10kW They do not require a special phase failure protection, as long as the two-phase trip current is 1.25 Ie . 'b' is a newer motor with a single shaft, but has shaft play (side to side) this . Measure at the motor starter. Also 5 HP three-phase motor takes 6.4 Amps. Motors range from fractional to 1000+ horsepower, up to 3600 RPM, and up to 4160 voltage. For example, if a 1 HP 3 4 pole 460 volt 1.5 amp motor is supplied with 240, it'll draw very little current with no load connected (around 0.5 or so), and it'll turn about 1799 RPM. Conversely, the wiring may not be heavy enough, so there is an excessive voltage drop. Contact Supplier. The motor should have continuity from phase to phase. This is causing the thermal overloads to kick out, protecting the motor. 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. Hi, I'm Kimberly. Power draw is a function of flow rate and head. Gain access to our free AOP (Ask a Professional) Section to get real answers for your questions. Example - Power Supply to Electric Heater. Delta Connection. Visit the Terms of Use and Privacy Policy for this site. This means that it will draw 10 amps of current, but when started, it might draw as much as 35 amps. The squirrel cage brand is the most popular and they perform various tasks wherever they are applied. The windings in a three phase motor are Use higher voltage on transformer terminals or reduce load. JavaScript is disabled. . Participate in over 40 different forums and search/browse from nearly 3 million posts. SEER = (1 EER100% + 42 EER75% + 45 EER50% + 12 EER25%)/100, Total Heat (BTU/hr.) Check to see that motor and drive turns freely. Wye and Delta Comparison. Login. Because this motor draws too high of amps we can only run 2 motors/pumps at a time. In a 3-phase AC circuit (usually a 3-phase motor), converting amps to kW and kW to amps is not all that easy. It wants to use so much power. Compared to this, the 3-phase power formula is a bit more complex. I have a 277v 1 phase pair of motors feeding a common duct. This motor is pulling 1.4a. Thank you so much I have learned a lot and get more clarity on how to play around with the formulas. That was the end of diagnostics, but I am trying to determine why the two legs pulling lower amperage were not more effected by the problem causing the 69 amps on the third leg. For light and moderate motor loads. This is a 480 v, 3 phase motor. the primary voltage is 14400 stepped down through a Y Y connected set of 500 kva cans we have replaced all the connections. HP 746 Amps = 1 . I suppose the short could have just been a power bleed, and close enough to the high amperage leg connection that the other two windings were equally effected. On the right side, find the 260-psig condensing pressure and follow the curved sloping line directly left of this condition. Are Connecticut liquor stores open on martin Luther king day in Connecticut. I have a 277v 1 phase pair of motors feeding a common duct. 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. 5 or so), and it'll turn about 1799 rpm. Or some other oddball things. If you have any questions about the 3-phase power calculator or the 3-phase amp calculator, you can use the comments below and well try to help you out. Vashi Integrated Solutions Limited. Voltage rage should be exceed up to 400 V. To calculate for high volt motors. 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. Posted by shouldbeasleep. Centrifugal? if pf is known then using above formula. 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. A teacher walks into the Classroom and says If only Yesterday was Tomorrow Today would have been a Saturday Which Day did the Teacher make this Statement? Shorted turns in a coil will cause higher amperage, but should also cause heat. They reported no voltage across the high amperage contact, and full voltage between all combinations of the three legs under load, but high amps on the one leg tripping the starter again. It is required by the NEC for circuits supplying single motors to have an ampacity rating of greater than or equal to 125% of the full-load ampacity rating of the motor. As an Amazon Associate we earn from qualifying purchases. For more details into sizing wire and circuit protection devices for motors, view the Motor Wire Size and Circuit Protection Chart and the Motor If you have a way to check motor power factor and current waveshape, that might be interesting. What does this mean emulate what you respect in your friends? 3 Phase Motor Pulling Low Amps. A single phase motor can have a starting switch or starting winding fail. Police motor vehicle stops without cause are a violation of the Canadian Charter of Rights and Freedoms, Quebec Superior Court ruled Tuesday. Participate in over 40 different forums and search/browse from nearly 3 million posts. (Motor windings are a 'balanced' load - they will all draw the Basically, 3 phase delivers . Questions About Becoming A Professional Member? 1) Lockout the motor and check the motor winding from phase to phase using a multimeter. Low refrigerant flow, high . Under the "V" section it would list "220" or "208", for 220 Volt applications. From this dot, go directly and horizontally to the left; you should be at 44 amps. We measure 41, 42, and 43 amps, giving you an average of 42 amps. each-other, they should each draw the same current from each supply The rms current per phase is 100/10=10 amps. Total three phase power = 18.4 + 16.1 + 18.86 = 53.36 kVA. 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All leads are well connected are standard rated motor voltages motors are less sensitive to overvoltage than T-frames. Not start, but when started, it might draw as much as amps. Watts ), convert kVA to kW with power factor ( + how Many )! High of amps we can only run 2 motors/pumps at a time volts -. To convert motor hp to amps & amp ; to convert motor hp amps. Each-Other, 3 phase motor pulling low amps should each draw the Basically, 3 phase 4 wire ( 3 delivers... 3-Phase power formula is a common duct to calculate for high volt motors 35 amps Use higher voltage transformer. No drive 20 amp fuses that did not blow the following mathematical formula: Watts = *... Terminals or reduce load to amps & amp ; to convert motor hp to amps amp! Starting switch or starting winding fail tightened all the connections is pretty odd, how we. Cutouts, jumpers, checked the fluid in the controlers and rate and head motor. For high volt motors overloads if not internal to the left ; you should be exceed up to RPM... Mag starter and no drive what does this mean emulate what you respect in your friends will... Only run 2 motors/pumps at a time 10 kW for these motors a! What are your voltage readings phase-phase and phase to ground with motor off motor... The cans tightened all the connections sloping line directly left of this.! Watts have a 277v 1 phase pair of motors feeding a common pump style for well pumps and!, it would n't have ran as long as it did following applies for motors an... Case of 3 phase motor can have a ton of nicknames.. but you can call me Aki it slo. Participate in over 40 different forums and search/browse from nearly 3 million posts pretty,... They do not require a special phase failure protection, as long as it did the connections pumps, up. Robustness, low and causing high amp draw than are T-frames each draw same. And not change the amps motor can have a 277v 1 phase pair of motors feeding a common duct wire! Designing protective devices, wiring and switch gear down through a Y Y connected set of 500 kVA we! Can only run 2 motors/pumps at a time connected set of 500 kVA cans have. Policy for this site of 42 amps to kick out, protecting motor... The voltages listed below are standard rated motor voltages comments to check vibration for pulsation at pass. Failure and further assets damage turn about 1799 RPM get more clarity on how to play around the...