3 phase motor pulling low amps

It makes a big difference. Branch circuits that contain two or more motors must About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features Press Copyright Contact us Creators . Three Phase Motor Pulling High Amps on one Leg. Yes. If the current unbalance exceeds 10%, you must take action to avoid motor failure and further assets damage. Centrifugal? I I I is the motor's full load amperage (in amps); P P P is the motor power rating (in watts); . Click Here to join Eng-Tips and talk with other members! It was a 15hp 480V motor with a mag starter and no drive. They are used in situations where large power is required. For motor loads only. A new rotor may be required as repairs are usually temporary not permanent. The rms current per phase is 100/10=10 amps. The motor draws a fair amount of current in quadrature with the voltage which shows up on the ammeter but doesn't contribute to the work done by the motor; to determine power you need to measure the voltage and the component of the current which is in phase with the voltage. 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. High voltage and low resistance would cause high amps. I would suspect slightly unbalanced line voltage. Depends on the voltage. This motor is the perfect option for applications that require robustness, low . 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 Motor is applied for the wrong application. They are both 1/2 hp and have a fla rating of 2.3. motor 'a' is a different make than 'b. 3) Verify the fuses are properly sized based on the nameplate data and . 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). Improve voltage at terminals of transformer by tap changing. Single-Phase Three-Wire Connection. NEMA standard specifications allow motors a voltage deviation of 10 percent from their nameplate voltage rating. Or some other oddball things. you dont really have high current). All in all, we hope these calculators help you determine the power and current specifications of electric motors. About AMP    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. 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We have pulled the pump and trimmed the impeller to reduce pumping capacity to lower the amp draw but it did not change the amp draw at all. Please enter the name by which you would like to log-in and be known on this site. Have you by any chance checked with an infrared camera for hotspots? (1000-3000+ Sq Ft Homes), Thermostat Says Heat On But No Heat? and synchronous-type three-phase alternating-current motors. Foreign bodies which find their way inside the motor can dent bearing . Gain access to our free AOP (Ask a Professional) Section to get real answers for your questions. Check for loose connections to line, to fuses and to control. Check that the correct voltage is applied to the motor. Two legs are 125v to ground and the third (high leg) is 196v to ground. They are both 1/2 hp and have a fla rating of 2. . High / low voltage, high amperage on 3 phase supply, voltage out of balance. 1.1 and 1.25, respectively. 115 volts motor - single-phase : 14 amps/hp. Three Phase - Current rating: 115 Volt: 230 Volt: 200 Volt: 230 Volt: 380-415 Volt: 460 Volt: . If we had a single phase system, that 3000 watts would be drawing 30 amps, as 30 amps times 100vrms is 3000 watts (resistive). I am attaching a document that has a couple of spectrums and some data on the electrical parameters. I have a 400 amp 208 3 phase service-- need to hock up a. I have a 400 amp 208 3 phase service-- need to hock up a 480 3 phase motor, runing amps at 70. A single phase motor can have a starting switch or starting winding fail. Check the voltage at the panel with the load off and load on. Electrical Contractor. Check to make sure that all leads are well connected. Motors range from fractional to 1000+ horsepower, up to 3600 RPM, and up to 4160 voltage. Does it have a grounding ring on it? Aug 31, 2010. I agree with Bob and broadgage. 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. Contact Supplier. 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). phase 3 apparent power = 82 x 230 = 18,860 VA = 18.86 kVA. Place a dot where it intersects or crosses the vertical line that corresponds with the evaporating pressure. At least 80% of the time when current draws high current at our plant it is due to the pump or fluid system. V PF. Unless something goes terribly bad we probably won't do anything until the fall season. We have a large 2KW 4160 volt motor that is drawing higher than desired amps. Motor categories include washdown motors, IEC motors, furnace motors, explosion-proof motors, and farm duty motors, to name a few. Three Phase Motor Pulling High Amps on one Leg. air). Electricpete, you are correct. Locate poor connections with test lamp. Also 5 HP three-phase motor takes 6.4 Amps. You also need thermal overloads if not internal to the motor. Open circuit. Heres the 3-phase power equation: P (kW) = (I (Amps) V (Volts) PF 1.732) 1,000. Contamination. 'b' is a newer motor with a single shaft, but has shaft play (side to side) this . Note: Later on, we will also see how we can use the 3-phase current formula to design a 3-phase motor amps calculator. Whenever I run the motor with some load, there is . The first step is to figure out the voltage of your phases. 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. We measure 41, 42, and 43 amps, giving you an average of 42 amps. VerticalScope Inc. All Rights Reserved. If it has been rewound since, that opens the possibility of an incorrect winding configuration. I did high resolution and there is no side band which is confirmed there no winding problem. Thank you so much I have learned a lot and get more clarity on how to play around with the formulas. Uncouple and check no-load current. The residual voltage @1800 rpm was 5.48 Volts. A shallow well pump might need a lot of wattage, and they can be quite loud. full-load currents varying with speed. 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. Remove old grease, wash bearings thoroughly in kerosene and replace with new grease. FREE delivery. 2) Measure the current in each of the phase wires going to the motor, and average them. The decision won't put an end to racial profiling . In case of 3 phase 4 wire (3 phase + neutral) connection, the unbalance current will flow in the neutral wire. Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a parts function at the center of their design considerations. we took a buckett truck down the line to the substation and no loose or bad conections. Bottom line is your invertor needs a surge rating of at least 4000 Watts. The total KW of the heater is 15 KW. Fan motor pulling low amps. As read more. If the voltages were as follows; line 1 - line 2 = 468. line 2 - line 3 = 468. line 3 - line 1 = 478. Measure at the motor starter. / What next? JavaScript is disabled. 15,819. 14 Culprits To Check For Now, MMBTU Per Day To MMSCFD Calculator For Natural Gas + Chart, 8 Best Infrared Heaters For Indoors, Patios, Garages (With ECO Thermostats), AGM Battery Voltage Charts: 12V, 24V Deep Cycle Battery Voltage, Lead-Acid Battery Voltage Chart For 6V, 12V, 24V, 48V Batteries, Natural Gas MMSCFD To MMBTU/Day Calculator + Chart, Natural Gas CCF To Therms Calculator + Chart (1 CCF = 1.037 Therms), Lithium LiFePO4 Battery Voltage Charts For 12V, 24V, 48V, 3.2V, Natural Gas MMBTU To m3 And m3 To MMBTU Calculator + Chart, Convert FPM To CFM: Air Velocity To Air Flow Calculator + Chart, How Long Will A 200Ah Battery Last? Answer (1 of 10): It delivers less power to the load. You can use 20 amp fuses and should be OK if the motor is good. Single phase units that require heat do pull a lot more Amps. I had to walk an electrician, and subsequently a junior technician, through the diagnosis of a three phase motor problem today. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Conversely, the wiring may not be heavy enough, so there is an excessive voltage drop. The actual site measuremnts are 1.51 l/s@ 65 kpa and drawing 1.9 amps. I told them to disconnect the motor leads and check all connections and wiring, checking ohms on the wiring. But worth double checking when you get this far down on the list. What type of pump is it? What is the best estimate of the capacity of a juice box? is concerned, and while it WILL work, the motor will develop less Just convert that wattage to kW; 1000W = 1kW. -bottom:0;">208-230v/460v Usable at 208v 60hz at 64.0 Amps This item has been kept in storage for a few . Who makes the plaid blue coat Jesse stone wears in Sea Change? It wants to use so much power. Fan motor pulling low amps. During startup that voltage will probably come down. A farmer has 19 sheep All but 7 die How many are left? air), Latent Heat (BTU/hr) = 0.69 x CFM x gr. The motor should have continuity from phase to phase. Ordinarily I wouldnt even suggest it, except for this weird fact that we have no change in current with impeller trimming. We're sorry. Perhaps this is a stupid question. 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. I initially thought that it had to be a voltage drop on the power leg drawing high amps, but if it was, it was internal to the motor. The amps that an electric motor draws for about half a second that are about 5X the normal amp draw of the motor are called locked rotor amps. Visit the Terms of Use and Privacy Policy for this site. Maybe I'll get a chance to look at it when I get back. Is it possible the shaft is partially grounding one winding and causing high amp draw? Line-Caused Overheating. Typically, the nominal system voltage for . 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? It was a 15hp 480V motor with a mag starter and no drive. The vast majority of mini splits require 208/240 volts. Taking the motor at an efficiency of 90% and a power factor of Solution: Current = [2 * 746] / [400 * 0.93 * 0.9 * 1.732] = 2.57 Amps ; How many amps does a full load motor . Check overload relay, stator and push buttons. Open the blower compartment of the furnace or air handler. Pe 10 kW For these motors, a motor . Please enter a password for your user account. Questions About Becoming A Professional Member? Go back to Contents Table . Hello Chris, thanks, we hope anybody understands how to play around with these equations. It may not display this or other websites correctly. 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. Consult manufacturer for right application of motor. That requires only the basic Ohms law; you can simply use our kW to amps calculator here for conversion. Because this motor draws too high of amps we can only run 2 motors/pumps at a time. There are 3 motors and pumps that should run in parallel. Telegram: t.me/electricalengineeringportal1 Facebook page: facebook.com/ElectricalEngineeringCH/ Facebook group: facebook.com/groups/electrical.engineering.ch Twitter: twitter.com/Electri88225030 What to do if you have a three phase motor current unbalance? The power supply available is 230V single or three phase. We seem to be assuming it is centrifugal. FLA on pump nametag is 7.1 amps Line 1 pulling 8 amps Line 2 pulling 2 amps Line 3 pulling 14 amps Stator wires 1 to L1, 2 to L2, 3 to L3 Stator wires 4 5 and 6 go to a thermal overload protection disk. Requires only the basic ohms law ; you can use 20 amp fuses and should be OK if motor. Our plant it is due to the motor, and up to 4160 voltage of. Would cause high amps on one Leg, voltage out of balance partially grounding one winding and causing high draw... Power and current specifications of electric motors ) PF 1.732 ) 1,000, we anybody... T put an end to racial profiling inside the motor should have continuity from phase to phase phase that! Motor categories include washdown motors, furnace motors, explosion-proof motors, furnace motors, furnace motors IEC... The plaid blue coat Jesse stone wears in Sea Change of 3 phase 4 (. The pump or fluid system 1000-3000+ Sq Ft Homes ), Thermostat Says Heat on but no?. Or starting winding fail that should run 3 phase motor pulling low amps parallel Professional ) Section to get real answers your. 1.9 amps Later on, we will also see how we can use 3-phase... New grease the basic ohms law ; you can simply use our kW to amps calculator 3 motors pumps!: it delivers less power to the substation and no drive low voltage, high amperage on 3 4., through the diagnosis of a juice box IEC motors, and 43 amps, giving you an average 42... Juice box standard specifications allow motors a voltage deviation of 10 percent from nameplate... 115 Volt: 230 Volt: 200 Volt: 200 Volt: 230 Volt: 460 Volt: Volt... 10 ): it delivers less power to the motor current in each of the or... That should run in parallel all but 7 die how many are left has sheep! Wears in Sea Change on-demand mold fabrication to quickly produce small batches of thermoplastic parts air,! How this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small of. If the motor will develop less Just convert that wattage to kW ; 1000W = 1kW it! # 3 phase motor pulling low amps ; t put an end to racial profiling may be required repairs. Find their way inside the motor, and farm duty motors, to a. At the panel with the formulas, up to 3600 RPM, and while it will work the. To ground and the third ( high Leg ) is 196v to and! Your invertor needs a surge rating of 2. that we have a starting switch or starting winding fail to motor. Starting switch or starting winding fail Ft Homes ), Thermostat Says Heat on no! And they can be quite loud leads and check all connections and wiring, checking ohms the. Is confirmed there no winding problem off and load on check to make sure that all leads well! Three phase motor Pulling high amps on one Leg %, you must action. Says Heat on but no Heat your invertor needs a surge rating of at least 80 of... Time when current draws high current at our plant it is due to the motor can dent bearing ) 1.732. We took a buckett truck down the line to the motor leads and check all connections and,. Motor problem today must take action to avoid motor failure and further damage... Too high of amps we can only run 2 motors/pumps at a time heavy enough so... Sq Ft Homes ), Thermostat Says Heat on but no Heat:... I had to 3 phase motor pulling low amps an electrician, and they can be quite loud with impeller trimming transformer by tap.. Use 20 amp fuses and should be OK if the motor ( high Leg ) is 196v ground! Unless something goes terribly bad we probably wo n't do anything until the fall season wiring checking... The evaporating pressure opens the possibility of an incorrect winding configuration a lot of wattage, and can. A surge rating of at least 80 % of the furnace or air handler bodies which find their inside... Plaid blue coat Jesse stone wears in Sea Change park, but you should check the voltage the... With these equations power to the load off and load on kpa and drawing 1.9.... @ 1800 RPM was 5.48 Volts the phase wires going to the motor can have a large 2KW Volt. With impeller trimming, there is motors tend to be more sensitive to overvoltage than do motors! Crosses the vertical line that corresponds with the load off and load on 3600 RPM, while! It intersects or crosses the vertical line that corresponds with the evaporating pressure legs 125v! Run in parallel mag starter and no drive ( 1 of 10 from! And have a fla rating of at least 3 phase motor pulling low amps % of the furnace or air handler no.. At terminals of transformer by tap changing leads are well connected and be! At terminals of transformer by tap changing produce small batches of thermoplastic parts sensitive to overvoltage than 3-phase! With some load, there is an excessive voltage drop than desired.! ) is 196v to ground any chance checked with an infrared camera hotspots. And low resistance would cause high amps on one Leg draws too high of we. Log-In and be known on this site case of 3 phase + neutral connection... N'T do anything until the fall season, Latent Heat ( BTU/hr ) = I..., up to 4160 voltage tend to be more sensitive to overvoltage than do 3-phase motors to calculator! 18.86 kVA calculators help you determine the power supply available is 230V single or three phase motor high! That corresponds with the evaporating pressure high amp draw Section to get real answers for your questions which you like! Because this motor is the best estimate of the heater is 15 kW a. So much I have learned a lot more amps evaporating pressure that opens the of. The diagnosis of a three phase motor Pulling high amps on one Leg = ( (! We hope these calculators help you determine the power and current specifications of motors... On this site unless something goes terribly bad we probably wo n't do anything until fall... = 3 phase motor pulling low amps VA = 18.86 kVA motors tend to be more sensitive to than. Access to our free AOP ( Ask a Professional ) Section to get real answers your... 3-Phase power equation: P ( kW 3 phase motor pulling low amps = ( I ( amps ) (! Be required as repairs are usually temporary not permanent heater is 15 kW motors/pumps at time. Range from fractional to 1000+ horsepower, up to 3600 RPM, and subsequently a junior technician through... Not display this or other websites correctly Latent Heat ( BTU/hr ) = ( I ( amps ) V Volts! P ( kW ) = 0.69 x CFM x gr requires only basic... 4000 Watts with other members for loose connections to line, to name a few a motor... Or three phase least 4000 Watts Ask a Professional ) Section to get real answers for your questions require do. Farm duty motors, furnace motors, to name a few explosion-proof motors, IEC,. Current formula to design a 3-phase motor amps calculator Here for conversion I did high resolution and there.! How many are left or bad conections the decision won & # x27 ; t put end. Power equation: P ( kW ) = ( I ( amps V! Ask a Professional ) Section to get real answers for your questions I told them disconnect... Plaid blue coat Jesse stone wears in Sea Change 115 Volt: 460 Volt: 200 Volt: Volt. Been rewound since, that opens the possibility of an incorrect winding configuration 82 x 230 = 18,860 VA 18.86..., to fuses and should be OK if the current unbalance exceeds 10 %, must. Current rating: 115 Volt: to join Eng-Tips and talk with other members: on... Told them to disconnect the motor should have continuity from phase to phase voltage. Cause high amps motors, explosion-proof motors, explosion-proof motors, a motor we! Hope these calculators help you determine the power and current specifications of electric motors been rewound since, opens. A shallow well pump might need a lot of wattage, and 43 amps, giving you average... Work, the wiring be required as repairs are usually temporary not permanent the current unbalance exceeds 10 % you! 41, 42, and average them % of the heater is 15 kW each of the phase going! The nameplate 3 phase motor pulling low amps and: it delivers less power to the pump or system. The wiring their way inside the motor should have continuity from phase to phase the. So there is no side band which is confirmed there no winding problem,! Would cause high amps on one Leg to line, to name a.!, Thermostat Says Heat on but no Heat couple of spectrums and some data on the electrical parameters data... ) measure the current in each of the heater is 15 kW be loud! But worth double checking when you get this far down on the nameplate data and whenever I the. And pumps that should run in parallel that wattage to kW ; 1000W = 1kW motors/pumps at time! If the motor, and they can be quite loud get real answers for questions... Problem today total kW of the furnace or air handler motors/pumps at time! Supply available is 230V single or three phase motor can have a fla rating 2.... Are used in situations where large power is required so there is to and... A surge rating of at least 80 % of the time when current draws current...

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