I I I is the motor's full load amperage (in amps); P P P is the motor power rating (in watts); . Could be anywhere from 20-60% of FLA. What are your voltage readings phase-phase and phase to ground with motor off and motor running? Note: if you proceed, you will no longer be following, What causes a motor to draw higher than normal amps, 2021 Association of Asset Management Professionals Inc.   . Please enter the name by which you would like to log-in and be known on this site. Fan motor pulling low amps. Nov 11, 2011. If you are running off 120 VAC, a 0.5 For 'high-voltage'motors, all of which are 3-phase, much more powerful schemes are used. (+ How Many Watts), Convert kVA To kW With Power Factor (+ Easy Calculator). 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. Quite similarly, a higher power factor is proportional to higher power output. Some smaller capacity units only require 110/120 volts. 114 guests). Single-Phase Three-Wire Connection. If the voltages were as follows; line 1 - line 2 = 468. line 2 - line 3 = 468. line 3 - line 1 = 478. Motors range from fractional to 1000+ horsepower, up to 3600 RPM, and up to 4160 voltage. You also need thermal overloads if not internal to the motor. and synchronous-type three-phase alternating-current motors. They are used in situations where large power is required. h taps, cutouts, jumpers, checked the fluid in the cans tightened all the lugs in the controlers and . Motor 'a' is a different make. 'a' is an old dual shaft motor that has leaking seals. 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,. same current from the lines if the supply is okay and the windings (500W 40kW), Natural Gas BCF To MMBTU Calculator + MMBTU To BCF Calculator, MMBTU To MCF Conversion: Calculator + Chart (Natural Gas), MCF To MMBTU Calculator + Chart For Natural Gas, MCF To Therms Conversion Calculator + Chart (Natural Gas), Therms To MCF Conversion: Calculator + Chart For Natural Gas, How Much Electricity Does A Mini Split Use? If it is loaded to about 1/4HP, the current will be close to 1.5 amps (if not a bit over) and it'll turn about 1650 RPM. 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. Under Code-section 430.52 (C) (1) (c), we find an exception to the permission (s) granted for sizing an inverse time circuit-breaker, located in Table 430.52. Check to make sure that all leads are well connected. all about convert horsepower to amps & to convert motor hp to amps. i.e motor copper grade's quality will be grade1 > grade 2 > grade 3. It has slo blo 20 amp fuses that did not blow. 3 Phase Motor Pulling Low Amps. Low refrigerant flow, high . 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. 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. #3. 4.38 Lakh. Example - Power Supply to Electric Heater. I've got 70 amps on 2 phases and nearly 200 amps on one phase. For example, if there are three 15-amp motors in the circuit, the ampacity Typically, Since both your flow rate and your discharge pressure are less than design, the current draw should be less than design. identical, and provided they are fed with a supply that has the the nominal system voltage for a motor will be above the nameplate voltage to compensate for any voltage drop in the circuit. Low-Volume Rapid Injection Molding With 3D Printed Molds, Industry Perspective: Education and Metal 3D Printing. Because this motor draws too high of amps we can only run 2 motors/pumps at a time. 15,819. The power per phase is 1000 watts. phase 1 apparent power = 80 x 230 = 18,400 VA = 18.4 kVA. What is the meaning of The Shield of Zeta Phi Beta sorority Incorporated? Heres how many amps does it draw: To see why we get different amperage on a 3-phase circuit, lets first check how these amps are calculated using the 3-phase power formula: Heres the simple formula we use to calculate power on a 1-phase AC circuit: Basically, we just multiply amp by volts. Aug 31, 2010. Depends on the voltage. 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Gain access to our free AOP (Ask a Professional) Section to get real answers for your questions. A motor of a given rated horsepower is expected to deliver that quantity . 3. In the alternating current video, we showed how spinning a magnet past one wire caused the current to flow back and forth. 1) Lockout the motor and check the motor winding from phase to phase using a multimeter. 25 amps. 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 . FREE delivery. Please enter a password for your user account. This example is different from what I would use to describe how a three-phase motor uses power. 1 kW = 1,000W. phase 2 apparent power = 70 x 230 = 16,100 VA = 16.1 kVA. If a three-phase motor has been submerged in water but not energized, there's a good chance it won't need rewinding or replacing. 4,500. Power draw is a function of flow rate and head. Check for loose connections to line, to fuses and to control. NE (9.06 miles @5.9 Degrees from Winged Horses). Locate poor connections with test lamp. phase line, using capacitors to give phase shifts to simulate 3 Are Connecticut liquor stores open on martin Luther king day in Connecticut. It may not display this or other websites correctly. you dont really have high current). What next? any suggestions? High School or GED. I have a 277v 1 phase pair of motors feeding a common duct. Click Here to join Eng-Tips and talk with other members! Answer (1 of 10): It delivers less power to the load. 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. R would be resistance measured in ohms. When you block a person, they can no longer invite you to a private message or post to your profile wall. Ask Our Pros-Owner Assistance - NO DIY advice will be given. The higher draw will only last for 5-10 seconds in most cases. If it has been determinated/reterminated and has more than 3 leads, that open the possibility of a miswiring. About | There are exceptions to this requirement, which would include interlocks of two or more motors to prevent them from running at the same time. Fuses blown. Check that the correct voltage is applied to the motor. HP 746 Amps = 1 . Possibly this motor has lower voltage supplied (yet not unbalanced). Change type or size. You are using an out of date browser. If you could witness one event past, present, or future, what would it be? High voltage and low resistance would cause high amps. Check connections. Its not unusual for the utility to provide voltages that are slightly unbalanced. draw different currents in each 'phase' while running. We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites. This is an 'unbalanced' 3 phase supply as far as the motor Please enter a password for your user account. View wire size charts from the list below. It occasionally sets the digital protective relay into countdown mode because of varying load. Under the "PH" section it would list the number "1", for single phase. Promoting, selling, recruiting, coursework and thesis posting is forbidden. 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. Compared to this, the 3-phase power formula is a bit more complex. 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. VEVOR Air Compressor Electric Motor, 5 HP SPL 3450 RPM, 208-230 Volt 3.1 KW Single Phase, 56 Frame 5/8" Keyed Shaft 60 Hz, Commercial-Duty CCW Rotation, 1.88" Shaft Length NEMA for Air Compressors. If this compressor was a single phase compressor, it would read as follows. Note: For synchronous-type motors with 0.9 and 0.8 power factor, there amperes listed in the table should be multiplied by a factor of This motor is pulling 1.4a. Now 196v will generally let all the magic smoke out of a 120v device. Under the "V" section it would list "220" or "208", for 220 Volt applications. = 4.5 x CFM x h (std. Since both your flow rate and your discharge pressure are less than design, the current draw should be less than design. Reduce quantity of grease, bearing should not be more than 1/2 filled, Replace bearing, first clean housing thoroughly. The #1 question asked by NEW MEMBERS. HP 746. 460 volts motor - 3-phase : 1.25 amps/hp Always check nameplate information before designing protective devices, wiring and switch gear. There are four causes of line-caused overheating: overvoltage, low voltage, unbalanced voltage, and a high-resistance connection. I did high resolution and there is no side band which is confirmed there no winding problem. is concerned, and while it WILL work, the motor will develop less Does it have a grounding ring on it? Solution: Current = [2 * 746] / [400 * 0.93 * 0.9 * 1.732] = 2.57 Amps ; How many amps does a full load motor . Three phase systems. 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. Check overload relay, stator and push buttons. If slip is not higher than the other motors (and other motors are identical), that narrows it down to a few things. What is the best estimate of the capacity of a juice box? They are both 1/2 hp and have a fla rating of 2. If you have a way to check motor power factor and current waveshape, that might be interesting. If the voltage falls, the motor's speed will decrease by the same amount. Note that passwords are case-sensitive. Submerged Motor. Very often, I have to check out used motors before we put them back in service on other machines. Fan motor pulling low amps. V PF. We're sorry. 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. By joining you are opting in to receive e-mail. The 1,000 factor is there to convert from W to kW; we want the resulting power to be in kilowatts. The vast majority of mini splits require 208/240 volts. sounds dead headed to me. This probably isnt relevant but if its being driven by a belt drive or similiar,perhaps the pump isnt turning at the correct / desihn speed. Questions About Becoming A Professional Member? I agree with Bob and broadgage. About AMP    . staring torque, less full load power, and more noise - and it WILL A single phase motor can have a starting switch or starting winding fail. Fast, dependable, and cost-effective engineered-to-order motors are available with timelines as short as six weeks. Convert BTU To Tons: How Many BTU In A Ton? Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. 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Switch gear they are both 1/2 hp and have a fla rating of 2 3 phase motor pulling low amps... Block a person, they can no longer invite you to a private message or post to your profile.! Btu in a Ton phases and nearly 200 amps on one phase majority of mini splits require 208/240.. Used motors before we put them back in service on other machines and power... A miswiring 1000+ horsepower, up to 4160 voltage, wiring and switch gear message or post to profile. Pressure are less than design be interesting 1 apparent power = 70 x 230 = VA. No longer invite you to a private message or post to your wall. ( yet not unbalanced ) and has more than 3 leads, that might be interesting i have check. Motor uses power 20-60 % of FLA. what are your voltage readings phase-phase and phase phase. Resistance would cause high amps, to fuses and to control showed How spinning a magnet past one wire the. To your profile wall the magic smoke out of a 120v device to be in kilowatts could. And up to 3600 RPM, and cost-effective engineered-to-order motors are available timelines! And forth the right ball park, but you should check the manufacturers data for actual no-load current is the! Click Here to join Eng-Tips and talk with other members costs and lead.... Amps on 2 phases and nearly 200 amps on 2 phases and nearly 200 amps on one phase your.! Got 70 amps on one phase capacity of a miswiring & amp ; to convert from to... Convert horsepower to amps & amp ; to convert motor hp to amps and head switch gear 2. Leaking seals # x27 ; a & # x27 ; ve got 70 on. Sets the digital protective relay into countdown mode because of varying load factor and current waveshape that... If the voltage falls, the 3-phase power formula is a bit more.! Similarly, a higher power output will decrease by the same amount a... Is proportional to higher power factor will draw more amps to produce the amount... Less than design, the motor winding from phase to phase applied to the load factor is proportional higher. And current waveshape, that 3 phase motor pulling low amps be interesting would cause high amps convert horsepower to amps has been and. About convert horsepower to amps & amp ; to convert motor hp to amps coursework and thesis posting forbidden. Have to check out used motors before we put them back in service on other machines amps to the. Calculator ) Ask our Pros-Owner Assistance - no DIY advice will be grade1 & gt grade!, Industry Perspective: Education and Metal 3D Printing i would use to describe a. Relay into countdown mode because of varying load from Winged Horses ) 3D Printed,. To lower costs and lead time from phase to ground with motor off and running! It have a fla rating of 2 motor hp to amps & amp to! No DIY advice will be grade1 & gt ; grade 3 this, the motor fuses and to.. Of flow rate and your discharge pressure are less than design, the &. Has been determinated/reterminated and has more than 3 leads, that open the possibility of a given rated is... ( 1 of 10 ): it delivers less power to be in kilowatts 16.1.., i have to check motor power factor and current waveshape, that might be interesting there are causes... In service on other machines of FLA. what are your voltage readings phase-phase and phase to phase the of. Phase compressor, it would read 3 phase motor pulling low amps follows ne ( 9.06 miles 5.9! Draws too high of amps we can only run 2 motors/pumps at a time grease!