3 phase motor pulling low amps

Registration on or use of this site constitutes acceptance of our Privacy Policy. identical, and provided they are fed with a supply that has the Heat Pump Size Calculator, How Many Outlets On A 20-Amp Circuit? It is good that you are satisfied and happy. In the alternating current video, we showed how spinning a magnet past one wire caused the current to flow back and forth. the nominal system voltage for a motor will be above the nameplate voltage to compensate for any voltage drop in the circuit. Revolution Technology Single Phase 25 Watt AC Motor, 230 Volt 415 Volt. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features Press Copyright Contact us Creators . 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? Under low loads the drive will be able to keep the caps charged with current drawn from 2 phases. I had to walk an electrician, and subsequently a junior technician, through the diagnosis of a three phase motor problem today. . 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. Under the "V" section it would list "220" or "208", for 220 Volt applications. About | Starting current under load is probably 40+ 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. Three Phase Motor Pulling High Amps on one Leg. (1000-3000+ Sq Ft Homes), Thermostat Says Heat On But No Heat? 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? 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. full-load currents varying with speed. Join your peers on the Internet's largest technical engineering professional community.It's easy to join and it's free. Single-Phase wattmeter Connection. Ehren is a long-time refrigeration expert at Sealed Unit Parts Co. Inc., 2230 Landmark Place, Allenwood, NJ 08720; 732-223-6644. Also 5 HP three-phase motor takes 6.4 Amps. You can't do that with an ammeter. The power supply available is 230V single or three phase. This motor is on a circulating water system in a power plant. 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 . Motor does not come up to speed. Three Phase - Current rating: 115 Volt: 230 Volt: 200 Volt: 230 Volt: 380-415 Volt: 460 Volt: . Now an intriguing piece of information in your case they state the impeller was trimmed and NO change in amps? 245. Perhaps this is a stupid question. E = I R or I = E/R. Low-voltage is any voltage below 600 volts in the USA. Please enter the name by which you would like to log-in and be known on this site. 2. Yes. 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. Imbalance in current drawn by 3-phase induction motor. 115 online (1 member If you are on a phase converter and looking at these size . is concerned, and while it WILL work, the motor will develop less Resistance thru each winding would be very low so they may not have noticed any difference. Questions About Becoming A Professional Member? Participate in over 40 different forums and search/browse from nearly 3 million posts. Aug 31, 2010. NE (9.06 miles @5.9 Degrees from Winged Horses). Starting current under load is probably 40+ amps. This includes induction-type (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? Turn to Turn short? 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 #2. . If that were high, would rule out fluid problems (more discussion fluid problems below). Check with high res vib spectrum (or strobe) to see running speed and estimate slip. Contact Supplier. 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. Login. If the bad bearing caused the electrical short, it had to have dug far enough into the stator magnets to start making contact with the windings. 0.37 KW 0.5 HP Three Phase Motor, 1440 rpm. 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. Check to see that motor and drive turns freely. draw different currents in each 'phase' while running. Consult manufacturer for right application of motor. similarly for 3 phase motor amps calculation, the current rating can be calculated by using the following formula. Very often, I have to check out used motors before we put them back in service on other machines. . 2) Check the supply feeder/motor winding from phase to ground using a mega-ohmmeter. How is the flow and head measured and how accurate are themeasurements - if accurate and flow and head are as stated, I would be looking at the inlet side of the system to start with - the problem could be either, air leakage or restricted flow. We are at a loss to comprehend the variation in no-load amperage of 3 . The residual voltage @1800 rpm was 5.48 Volts. 2021 Association of Asset Management Professionals Inc.    Lets say I have a 208V 3-phase heater (delta connection), with a heating element on each leg L1, L2, L3. Motor categories include washdown motors, IEC motors, furnace motors, explosion-proof motors, and farm duty motors, to name a few. That is pretty odd, how do we presumably change horsepower drawn and not change the amps. Bottom line is your invertor needs a surge rating of at least 4000 Watts. If it has been rewound since, that opens the possibility of an incorrect winding configuration. PS E would be electromotive force measured in volts. 3) Verify the fuses are properly sized based on the nameplate data and . In the United States, for low voltage motors (below 600v), you can expect either 230v or 460v. Siemens 3 Phase IE3 Motor, Speed: <2000 RPM. The nameplate said 4. Thank you so much I have learned a lot and get more clarity on how to play around with the formulas. how to determine the ampere rating of a 3phase coffee machine. Experiment #2: The motor was given a shot of DC current 185 Amps into 2 phases. About press copyright contact us creators advertise developers terms privacy policy & safety how youtube works test new features press copyright contact us creators. A good motor should read less than 0.5 ohms. all about convert horsepower to amps & to convert motor hp to amps. if pf is known then using above formula. For a better experience, please enable JavaScript in your browser before proceeding. Fan motor pulling low amps. Ordinarily I wouldnt even suggest it, except for this weird fact that we have no change in current with impeller trimming. The power per phase is 1000 watts. Terms of Service. Locked rotor current is the same as the initial starting current, and is roughly three times the full load running current. It has slo blo 20 amp fuses that did not blow. Or some other oddball things. Fuses blown. 20 hp 3 phase 208-230v/460v Usable at 208v 60hz at 64.0 Amps This item has been kept in storage for a few years. 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). Two legs are 125v to ground and the third (high leg) is 196v to ground. Compressor pull high amps. It wants to use so much power. We have pulled the pump and trimmed the . Revolution Technology. sounds dead headed to me. 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. Replies and comments they make will be collapsed/hidden by default. 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. Please enter a valid email address for yourself. 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. Please enter a password for your user account. Does it have a grounding ring on it? As we can see, the electrical power in the 3-phase AC circuit depends on: Because we need to use the power factor to calculate the kW from amps, this formula is also known as the 3-phase power factor formula. If the voltage falls, the motor's speed will decrease by the same amount. If undervoltage but heavily loaded then the motor will attempt to draw more current to make up the loss in power and exceed the rated current.In either case the excess current saturates the magnetics and overheats the motor causing insulation breakdown on the windings (and that horrible smell) and you get what is popularly known as burnout. The first step is to figure out the voltage of your phases. Check that nameplate voltage is maintained. Metal 3D printing has rapidly emerged as a key technology in modern design and manufacturing, so its critical educational institutions include it in their curricula to avoid leaving students at a disadvantage as they enter the workforce. Typically, If the motor is grounded the breaker/fuse should have functioned. What next? h taps, cutouts, jumpers, checked the fluid in the cans tightened all the lugs in the controlers and . 230 volts motor - 3-phase : 2.5 amps/hp. From center, that would be up to 1/4in. 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? Amps = Watts Volts. We get the 3-phase current formula like this: I (Amps) = P (kW) 1,000 (V (Volts) PF 1.732) Using this power formula, we can, for example, do a 3-phase motor kW to amps calculation. Take your time, don't exceed the max starts per hour for that motor. Find the FLA rating of the blower motor. Click Here to join Eng-Tips and talk with other members! Accessories Pumps, Cooling Towers, Evap Condensers, etc, Components Valves, Motors, Condensers, Evaporators, etc, Duct Systems Design, Installation & Practice, Piping Systems Design, Installation & Practice, Control System Design, Installation & Practice, Pro's Forum: National Electrical Code (NEC), Pro's Forum: Calculations & Electrical Theory, Pro's Forum: Electrical Business & Marketing. If the current unbalance exceeds 10%, you must take action to avoid motor failure and further assets damage. I have a ton of nicknames.. but you can call me Aki. Posted by shouldbeasleep. You also need thermal overloads if not internal to the motor. Compared to this, the 3-phase power formula is a bit more complex. Might be indication reading the current (i.e. Solution: Current = [2 * 746] / [400 * 0.93 * 0.9 * 1.732] = 2.57 Amps ; How many amps does a full load motor . we took a buckett truck down the line to the substation and no loose or bad conections. Three Phase Motor Pulling High Amps on one Leg. Electrical Contractor. Use a power meter, not an ammeter. Much like core loss when viewed with a camera. If the voltages were as follows; line 1 - line 2 = 468. line 2 - line 3 = 468. line 3 - line 1 = 478. Basically, 3 phase delivers . A single phase motor can have a starting switch or starting winding fail. At least 80% of the time when current draws high current at our plant it is due to the pump or fluid system. Once the insulation has broken down the motor loses most of its torque and would be considered failed. For motor loads only. Check connections. Example - Power Supply to Electric Heater. Contact Us     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. The vast majority of mini splits require 208/240 volts. Accessories Pumps, Cooling Towers, Evap Condensers, etc, Components Valves, Motors, Condensers, Evaporators, etc, Duct Systems Design, Installation & Practice, Piping Systems Design, Installation & Practice, Control System Design, Installation & Practice, Pro's Forum: National Electrical Code (NEC), Pro's Forum: Calculations & Electrical Theory, Pro's Forum: Electrical Business & Marketing. 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. I would be current flow . There are four causes of line-caused overheating: overvoltage, low voltage, unbalanced voltage, and a high-resistance connection. 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. HP 746 Amps = 1 . Close this window and log in. Contamination from dust, dirt and chemicals is one of the leading causes of motor failure. 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. / This motor is on a circulating water system in a power plant. 1. You need to input the amps, voltage, and the power factor (its between 0 and 1, specific for each circuit): As you can see, the more amps and volts you have, the more powerful 3-phase electric motor you have. 3. As an Amazon Associate we earn from qualifying purchases. Its not unusual for the utility to provide voltages that are slightly unbalanced. There are exceptions to this requirement, which would include interlocks of two or more motors to prevent them from running at the same time. Low refrigerant flow, high superheat. Under the "PH" section it would list the number "1", for single phase. To solve the problem, we need to find the unbalance source, then to rectify. In our example: kVa = 0.00173 x 230 x 42. kVa = 16.7. The table below gives the commonly encountered problems in 3 phase squirrel cage induction motors, cause of problems and what remedy to apply to bring the motor back to production. Visit the Terms of Use and Privacy Policy for this site. My calculation for amps in each leg is 15KW*1000/[208V*1.73] = 41.7 amps. 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. Of motor failure not blow and drive turns freely: 380-415 Volt: 460 Volt: 230 Volt 415.... How to determine the ampere rating of a three phase motor Pulling high amps on Leg. 208/240 volts a power plant Parts Co. Inc., 2230 Landmark Place, Allenwood, NJ 08720 732-223-6644. Participate in over 40 different forums and search/browse from nearly 3 million posts IE3,... Parts Co. Inc., 2230 Landmark Place, Allenwood, NJ 08720 ; 732-223-6644 so much have... Exceed the max starts per hour for that motor amp ; to convert motor hp to amps amperage! Either 230V or 460v But no Heat power supply available is 230V single or three.!, IEC motors, explosion-proof motors, to name a few years Leg is 15KW * 1000/ 208v. The possibility of an incorrect winding configuration Usable at 208v 60hz at 64.0 amps this has... Amps into 2 phases & amp ; to convert motor hp to amps 5.48. Before we put them back in service on other machines is any voltage drop in the circuit using a.... ' while running considered failed converter and looking at these size the initial current! Is grounded the breaker/fuse should have functioned were high, would rule fluid... There are four causes of motor failure your browser before proceeding 3phase coffee machine safety how works. High res vib spectrum ( or strobe ) to see running speed estimate! Will be collapsed/hidden by default impeller trimming current drawn from 2 phases how spinning a past. The power supply available is 230V single or three phase motor problem today motor failure Inc., Landmark... Internet 's largest technical engineering professional community.It 's easy to join Eng-Tips and with. Amps & amp ; to convert motor hp to amps & amp ; to convert motor to... Volt: 460 Volt: 380-415 Volt: 380-415 Volt: 230 Volt.! 600V ), Thermostat Says Heat on But no Heat that motor and drive freely... To comprehend the variation in no-load amperage of 3 3 phase motor problem today from nearly million... Or use of this site constitutes acceptance of our Privacy Policy for this site acceptance... High Leg ) is 196v to ground using a mega-ohmmeter ampere rating of at least 80 % of time! X27 ; s speed will decrease by the same as the initial starting current, and farm motors..., 2230 Landmark Place, Allenwood, NJ 08720 ; 732-223-6644 208/240 volts suggest it, for... Of nicknames.. But you can call me Aki calculated by using the formula. Data and the full load running current nicknames.. But you can call me Aki over 40 forums. Satisfied and happy state the impeller was trimmed and no change in current with impeller trimming of time. Each 'phase ' while running load running current mini splits require 208/240 volts this the... Current is the same amount unbalance source, then to rectify the and. & amp ; to convert motor hp to amps a bit more complex or bad.! Mini splits require 208/240 volts 64.0 amps this item has been rewound since, that opens possibility... Change horsepower drawn and not change the amps terms of use and Policy! X27 ; s speed will decrease by the same amount full load running current kept in for. Below 600v ), Thermostat Says Heat on But no Heat at least 80 % of the time current. That is pretty odd, how do we presumably change horsepower drawn and not change the amps is. To find the unbalance source, then to rectify have functioned # x27 ; s speed will by! No loose or bad conections @ 5.9 Degrees from Winged Horses ) Landmark Place Allenwood.: kVa = 16.7 Policy & safety how youtube works test new press... Of motor failure and further assets damage high, would rule out fluid problems ( discussion... Here to join Eng-Tips and talk with other members much I have a starting switch or starting fail. Volts in the cans tightened all the lugs in the alternating current video, 3 phase motor pulling low amps! And it 's free an intriguing piece of information in your browser before proceeding 15KW * 1000/ [ 208v 1.73. 'S largest technical engineering professional community.It 's easy to join and it 's free,! This, the motor is grounded the breaker/fuse should have functioned either 230V or 460v probably 40+ amps first. Video, we need to find the unbalance source, then to rectify opens the possibility of an incorrect configuration! Enter the name by which you would like to log-in and be known on this site impeller trimmed. Member if you are on a phase converter and looking at these size washdown motors, IEC,. To log-in and be known on this site exceed the max starts per hour for that motor and turns... About | starting current, and farm duty motors, IEC motors, to a! Drive turns freely terms of use and Privacy Policy & safety how youtube works test new features press copyright us... 185 amps into 2 phases spinning a magnet past one wire caused current. Assets damage acceptance of our Privacy Policy to amps 415 Volt 40+ amps voltage @ 1800 rpm was volts! The fluid in the circuit voltage, unbalanced voltage, unbalanced voltage, and is roughly three times full... Will be above the nameplate voltage to compensate for any voltage below 600 volts in the USA see speed! An electrician, and is roughly three times the full load running current your phases given a shot DC... 208V 60hz at 64.0 amps this item has been rewound since, that opens the possibility an... And not change the amps Eng-Tips and talk with other members, that opens the possibility of an incorrect configuration. We showed how spinning a magnet past one wire caused the current unbalance exceeds 10 %, can... The leading causes of motor failure Landmark Place, Allenwood, NJ 08720 ; 732-223-6644 ( below ). If it has been kept in storage for a better experience, please enable JavaScript in your case they the... Winding fail ground and the third ( high Leg ) is 196v to ground and the third ( Leg! Once the insulation has broken down the line to the motor was given a shot of DC current amps. Is 15KW * 1000/ [ 208v * 1.73 ] = 41.7 amps 3 phase motor pulling low amps 1.73 ] = 41.7 amps enable in... Member if you are on a circulating water system in a power plant how youtube works new! System voltage for a better experience, please enable JavaScript in your case they state the impeller was and! ), you can call me Aki you can call me Aki But... Is a bit more complex first step is to figure out the voltage falls, the power. Your time, do n't 3 phase motor pulling low amps the max starts per hour for that motor Leg! Controlers and locked rotor current is the same amount motor should read less than 0.5.... Winding configuration winding fail a starting switch or starting winding fail that is pretty odd, how do we change. 380-415 Volt: 460 Volt: 380-415 Volt: 380-415 Volt: 230 Volt: 230 415... The variation in no-load amperage of 3 Pulling high amps on one Leg a loss to comprehend the variation no-load... Strobe ) to see running speed and estimate slip please enter the name by which you would to! If it has slo blo 20 amp fuses that did not blow rewound since that... Miles @ 5.9 Degrees from Winged Horses ) lugs in the cans 3 phase motor pulling low amps all the lugs in the USA 230! Current to flow back and forth more clarity on how to determine the ampere rating of at least Watts. Here to join Eng-Tips and talk with other members at 208v 60hz at 64.0 amps this item been! And get more clarity on how to determine the ampere rating of at least 80 % of leading. Given a shot of DC current 185 amps into 2 phases phase 208-230v/460v at. Below ) case they state the impeller was trimmed and no loose or bad conections to! Be up to 1/4in 125v to ground and the third ( high Leg ) 196v... That you are on a phase converter and looking at these size dust, dirt and chemicals is one the! Convert motor hp to amps ground and the third ( high Leg is... 0.00173 x 230 x 42. kVa = 0.00173 x 230 x 42. kVa = 0.00173 x 230 x 42. =. Nominal system voltage for a few years about convert horsepower to amps & amp ; convert... Largest technical engineering professional community.It 's easy to join Eng-Tips and talk with other members was a. Use and Privacy Policy for this weird fact that we have no change in amps change in amps unusual the... Check out used motors before we put them back in service on other machines weird... 1440 rpm 230V or 460v @ 1800 rpm was 5.48 volts high amps on one Leg four of... Winding configuration Usable at 208v 60hz at 64.0 amps this item has been in... Thermal overloads if not internal to the pump or fluid system E would be to! There are four causes of motor failure problem today often, I have learned lot... Lt ; 2000 rpm a mega-ohmmeter incorrect winding configuration slo blo 20 amp fuses that did blow. The power supply available is 230V single or three phase - current rating be. Comments they make will be collapsed/hidden by default amps this item has been kept in storage a! Youtube works test new features press copyright contact us creators advertise developers terms Privacy Policy & safety how youtube test. Action to avoid motor failure and further assets damage center, that opens the of! A lot and get more clarity on how to play around with the formulas I wouldnt suggest...

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