single phase motor keeps blowing fuse

Yikes, yeah that's bad. The chap had got it on a 3 phase plug but it is 240V motor. Table Saw keeps blowing 20 amp fuse. An overloaded circuit is the most common reason for a circuit breaker tripping. However, if the motor was running and one of the fuse blows off, the motor will continue running drawing high current, ultimately burning out. 3.) This is known as single phasing. It has been blowing a single fuse, single phasing then dropping out on overloads. They are specific to the particular motor referred to in the title and shown in the photos (250W, 2.9A, 50Hz, 220/240V AC). Page 1 of 3 1 2 3 Next > Mannyroad, Mar 21, 2019 #1. This type of question is full of possibilities for answers since the non-specific nature of the question assumes the one answer fits all. In searching for a solution I have found this: In case of a single or open phase, all the different combinations available must be checked to make sure that all the connections are in order, especially, the red to blue, blue to yellow, and red to yellow phases. The first time it did this it blew the B phase fuse. It is a single phase induction motor, 3kw. Electric motor starting & run capacitor troubleshooting FAQs Questions & Answers about Electric Motor Start-Boost or Run Capacitors Capacitors are electric devices that get an electric motor running at start-up or that help keep a motor running once it has started. The motor then continues running with two phases and can suffer damage. It still might be a fun project, I've never had a motor burn out like that but if I did I'd be tempted to try. A used 220 volt motor should easily pass a 1000 volt megohm meter test if it is any good. Took it apart today and it doesn't look good. I have just bought a wood working thicknesser. I am trying to find out why an air master tiger 14/60 turbo air compressor keeps blowing the 13amp fuse. The compressor is a 230 volt, 10 Amp 2.2Kw motor. I grab two legs of the 120v and run them through a fuse … 2. my guess is the start switch has failed shorted, and that is probably the reason the old motor start cap blew up. Anybody have any … 1.) I grab two legs of the 120v and run them through a fuse … 0 Members and 1 Guest are viewing this topic. Check voltage after the starter. This is the complicated task of how to diagnose a short circuit that prevents the car from starting. The motor will come up to speed, run for a few minutes, pump water then trip the overloads. Small to medium sized motors are mostly stator critical – this means that only the stator can be damaged. Overheating is a primary cause of a failed start capacitor. I have a 1/2 HP motor that can be wired either 120V or 240V single phase. Small to medium sized motors are mostly stator critical – this means that only the stator can be damaged. Check Red to Blue, Blue to Yellow, and Red to Yellow phases. Phase failure. This is the complicated task of how to diagnose a short circuit that prevents the car from starting. This transformer is used to power the brake control module I replaced the one of 3 fuses and it started up fine but then a different fuse blew upon braking. "Why does my Motor keep blowing Fuses and Tripping Breakers? Verify the motor phases have continuity from phase to phase for all combinations using a multimeter from the motor starter. The unit is a 6ton, 240v 3ph. The cause is, for example, blown fuse. Yes there is a motor run one as well, no obvious swelling of that one. Stripped the pump last month, sorted out the bottom end and pump is now good as new. The fuses are LPJ-30SP , it was fully functional before the mechanics pulled it. The main source of power to the motor must be shut off immediately in order to conduct an inquiry to identify the exact reason for the tripping. This Instructable dea… This is known as single phasing. Stripped the pump last month, sorted out the bottom end and pump is now good as new. The nameplate says 35A min circuit capacity, 50A max over-current protection. The motor will come up to speed, run for a few minutes, pump water then trip the overloads. Note that it is NOT standard residential 240v with a neutral. Help with a single phase 2KW motor that's blowing fuses, Re: Help with a single phase 2KW motor that's blowing fuses. It just had bad bearings. I saw it running before buying and after getting home blow fuses. Heres what i have: Baldor Reliance L3510 wired through a distributor to run on single phase 120v 60hz. A damaged or burnt out capacitor may … It occurs when a circuit is attempting to draw a greater electrical load than it is intended to carry. There may be instances of less amount of power or amps that is getting to the motor and yet tripping occurs. Turbo Member. A phase failure is an interruption of a single conductor. It is also beneficial to make sure that the overload relay system is adjusted correctly. The problem is only one winding is burnt, you need to burn the others too so they're all even and you should be good to go. It keeps blowing the fuse on the "B" leg in the service disconnect. 10Hp equates to 7500 watts. Sawdust is a major killer of motor windings. The exact voltage that is being supplied to the motor must be checked on a regular basis, including the possibility of loose contacts that can result in tripping or blown fuses. Locate motor nameplate FLA in the column appropriate for the type of motor and type of protection required. MCB does not trip when this happens, always there is no sign of bad connections or a short in the cables. Wiring Up a Brooke Crompton Single-phase Lathe Motor (Myford Lathe): Here are a few notes about wiring up my small lathe motor. A bad motor capacitor may cause starting problems or could shut off the motor while running. The notes are simply to show my own set-up. ... NEC Table 430.248, the full load current for a 2 HP, single phase motor is 24 Amperes. You may hear it humming or observe that it's getting hot. You didn't say what the horsepower of the motors was, or the status of the convryor's loading. They can be rewound but I'm not sure if anyone does that anymore. This troubleshooting guide can also be applied to other types of three phase induction motors: Woodworking machinery has high speed cutter heads, usually driven from a 2 pole motor with a belt on a 2:1 increase in speed to give the cutter head a speed in the order of 5600 rev min. I think I'd be inclined to find an old used motor in good shape over a $125 new one. If I turn it on it will start to run for about 2 seconds then blows the fuse. Measuring 480 on the line and load side of a blown fuse would be normal, because you're measuring one phase on the line side of the blown fuse and the other phase (through the windings of the motor) on the load side. Overloaded Circuit . Generally, this is set at 110% of the total power capacity of the motor. Sounds like the fan motor is dragging badly and needs to be replaced. Over 3 phases that will be 2500 watts per phase and assuming Uo to be 230V the current will be 11A per phase. 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. Pump is recently new as is control switch/head bleed valve. It just had bad bearings. Open circuit and Short circuit Test on transformer, It is possible that there is a mechanical overload on the motor that may cause repeated tripping and even damage to the. If the capacitor has failed the symptom is that the motor won't start. It is 2.2KW. Electric motor starting & run capacitor troubleshooting FAQs Questions & Answers about Electric Motor Start-Boost or Run Capacitors Capacitors are electric devices that get an electric motor running at start-up or that help keep a motor running once it has started. Messages: 3,656 Location: Fermanagh, Northern Ireland. If your air compressor is running overly long, perhaps air is blowing back out of the intake valve instead of down into the tank, then the motor will heat up and that could lead to a blown fuse or breaker. Re: Help with a single phase 2KW motor that's blowing fuses « Reply #13 on: February 07, 2017, 05:14:06 am » I think I'd be inclined to find an old used motor in good shape over a $125 new one. Looks like the start switch failed and burned out the winding. If the capacitor is fine, and the only way to check is to do a capacitance check, and if it is not within 5% of marked value, and it will do an insulation resistance check pass ( 20M with 500VDC applied and no nasty crackling noises from the unit), and the start switch is fine ( a 40W incandescent lamp across the start cap) and opening as the motor runs up to speed then the only other likely fault is a shorted winding. Mannyroad Member. Turbo, Mar 22, 2019 #4. It holds moisture and the moisture leeches chemicals out of the sawdust that attacks the insulation. There are three wires coming out of the enclosure: 2 black and 1 green. Discussion Starter • #1 • Feb 7, 2015. Calculations say the FLA is 2.255. In many cases, the drive components may need to be suitably aligned with the motor to avoid any mishaps of this nature. Verify the motor phases have continuity from phase to phase for all combinations using a multimeter from the motor starter. It is a Central Machinery table Saw, with a 2 hp motor wired for 110vl? Check voltage after primary fuses. Use a clamp on the meter to check the amps when the motor is running to identify if there is an overload occurring. Fuses come in many shapes, sizes, and configurations. if all phases are available at motor end. I can smell it from here so yeah that needs replacing! I have a Welch Vacuum Pump which contains an Emerson 8917A motor (0.5 HP, single phase, 120V, 4.6 amps). It has been blowing a single fuse, single phasing then dropping out on overloads. The start capacitor (161-193 uF, 125V) failed (black goo everywhere, motor would hum but not turnover) and I replaced it and then it failed again (brown goo everywhere) after about 1 week of use. It will run for about 30 min in hot weather then … This is a sure sign that there is a defect in the motor. You may hear it humming or observe that it's getting hot. If the capacitor has failed the symptom is that the motor won't start. Blowing a 40 amp fuse (and continually causing it to blow) will create more problems at some point. If you replace it, you might consider a totally enclosed fan cooled motor. The notes are simply to show my own set-up. Cause 6: The Wrong Type of Fuse Was Installed. It occurs when a circuit is attempting to draw a greater electrical load than it is intended to carry. Fortunately those motors are common as can be. If the blower motor relay develops any sort of problem that hinders its ability to properly limit and distribute power, it may cause the blower motor fuse to blow. The correct answer requires a specific condition and circumstance. Troubleshooting Treadmill Motor Control Board - Fuse & Mosfet keeps blowing (RESOLVED) Technical Repair: 77: Jan 20, 2017: W: Motor control circuit is blowing mosfet driver (tc4429) Analog & Mixed-Signal Design: 12: Apr 22, 2016: Z: Treadmill motor control board keeps blowing fuse: Technical Repair: 19: Apr 4, 2016 Motor capacitors store electrical energy for the motor to use. It’s a 5hp GE 1phase/220v compresses motor mounted on an 80gal vertical tank with single stage v-twin pump. Heres what i have: Baldor Reliance L3510 wired through a distributor to run on single phase 120v 60hz. One model of compressor motor start capacitor Yeah that smell is one of the worst smells ever, it permeates everything, handle it and your hands will still smell the next day. Amps: 12.4. 1 Horsepower. Power distribution in the building is 3 phase 120v 60hz (4 wire). When I was a kid there was an old fashioned hardware store run by a family friend. The first time it did this it blew the B phase fuse. In the UK, where standard single phase is 240 v Motor is a twin capacitor type, 200MFD start cap, 30 MFD run capacitor. If the start cap has died, and it still is tripping the mains then either the motor run cap has died ( very likely in these, as they tend to use a cheap one there) and you need a new one. A Free & Open Forum For Electronics Enthusiasts & Professionals, Login with username, password and session length. 474V everywhere checking phase to phase. In case of a single or open phase, all the different combinations available must be checked to make sure that all the connections are in order, especially, the red to blue, blue to yellow, and red to yellow phases. The fuse that has been blowing is a 50A, the other two are both 45A. 1 Horsepower. The motor is a 1.5 -2.0 HP Single phase 240 volt domestic electric motor . The higher the capacitance of the capacitor the more energy it can store. The actual source of the trip point of the relay must be located and replaced, if found defective. Based on Motor Actual Full Load Currents 6 Better protection is achieved when fuse ratings are based on motor actual FLA obtained from motor nameplates. Check Red to Blue, Blue to Yellow, and Red to Yellow phases. Jump to Latest Follow ... After the normal checks I determined a fuse supplying power to a transformer in the unit was blown. A phase failure is an interruption of a single conductor. Measure the load current - might be it is over shooting because of issues with bearings, loss of phase supply or may be any other issue - sat RTS. 3 Posts . Check voltage before the starter. They are specific to the particular motor referred to in the title and shown in the photos (250W, 2.9A, 50Hz, 220/240V AC). The motor then continues running with two phases and can suffer damage. This is called single phasing of 3phase induction motor. Wiring Up a Brooke Crompton Single-phase Lathe Motor (Myford Lathe): Here are a few notes about wiring up my small lathe motor. I don't know if this makes a difference but this is a late 70's machine with all old stuff. Consider this issue if you are experiencing fuses and breakers blowing. If I take off the drive belt then motor runs fine but when placed back on blows the fuse. hello, i have a single phase electric motor blowing fuses, its a 240 volt 2.2kw motor and every time i plug it in it blows the fuse 13 amp any ideas as to why thanks These capacitors will occasionally fail, causing a compressor to fail to start. Amps: 12.4. The only worse smell I recall was a burning out selenium rectifier. You can buy the capacitors on ebay a lot cheaper than from Clarke! Note that it is NOT standard residential 240v with a neutral. The fuses are LPJ-30SP , it was fully functional before the mechanics pulled it. Use a clamp on the meter to check the amps when the motor is running to … 3phase motor blowing fuses. Phase failure. I went to troubleshoot a motor that is blowing fuses on one leg of a 3 phase motor, its fed from a 1 phase to 3 phase converter(no nameplate on the converter) the line side breaker is 100A, Im assuming its a 3 phase delta with a high leg, L1 119v(the problem one), L2 119v, L3 221v, L1 to L2 234v, L2 to L3 249v, L1 to L3 251v. I am having an issue with one of my compressors drive motor consistently blowing fuses. Blown fuses. By using an extension cord you may be starving the motor of sufficient power, the motor overheats, and a blown fuse or breaker may result. Check voltage before the secondary fuses. it locked up and fuse tripped. Overloaded Circuit . The 3 phase motor will not start and the the motor will burnt out due to flow of high locked rotor (short circuit) current. It's possible for the contacts to weld themselves and remain closed even if the centrifugal mechanism is still functioning though. I know that smell. In case of a single or open phase, all the different combinations available must be checked to make sure that all the connections are in order, especially, the red to blue, blue to yellow, and red to yellow phases. There are small lies, big lies and then there is what is on the screen of your oscilloscope. I'd definitely suspect the start switch, usually you can hear a distinct click as it re-engages while the motor is spinning down to a stop. Use a clamp on the meter to check the amps when the motor is running to … This Instructable dea… Basic construction and working of a DC Generator. And it appears the motor starter is just a motor starter. There are three wires coming out of the enclosure: 2 black and 1 green. I found it with this fuse configuration which makes me wonder if this has been a problem before. An overloaded circuit is the most common reason for a circuit breaker tripping. The motor problem may be that the windings have shorted, the capacitor wires have come loose, or the motor is just plain wearing out. After 3yrs no problems , one of the capacitors blew, motor would not start. 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. Maybe not all the cheap new ones are that bad though. The cause is, for example, blown fuse. Many look similar but actually have very different functions. Power distribution in the building is 3 phase 120v 60hz (4 wire). 3) An electrical possibility is that the motor has an open phase. Many single-phase compressors require a start capacitor to assist in starting the motor. Basic construction and working of a dc generator, Construction and working of an AC generator or alternator, Working principle and types of an Induction motor, Difference between synchronous motor and induction motor, Basic construction and working of transformers. The motor is a 1.5 -2.0 HP Single phase 240 volt domestic electric motor . Monitor it and if it keeps tripping, call an electrician to check. No. Its on an exhaust fan. Might be there is phase failure or two phases / or a phase and ground gets entices en-route to motor. In the UK, where standard single phase is 240 v Motor is a twin capacitor type, 200MFD start cap, 30 MFD run capacitor. Thank you all, that's a good set of tips to start off with. It is possible that the compressor motor itself is the problem when your air compressor is blowing fuses-breakers. They had a guy in back who rewound electric motors of all types, stuff was a lot more expensive back then and it was worth doing. To a transformer in the column appropriate for the type of fuse was Installed used 220 motor. 2 HP motor wired for 110vl: 2 black and 1 Guest are viewing topic. The most common reason for a few minutes, pump water then trip overloads. Are experiencing fuses and Breakers blowing but i 'm not sure if anyone does anymore. A 230 volt, 10 amp 2.2Kw motor a few minutes, pump water trip. The normal checks i determined a fuse supplying power to a transformer in the when... On the screen of your oscilloscope to a transformer in single phase motor keeps blowing fuse morning when it 's for... ’ s a 5hp GE 1phase/220v compresses motor mounted on an 80gal vertical tank with single stage v-twin pump the! Motor keep blowing fuses to avoid any mishaps of this nature makes a but! Prevents the car from starting a bad motor capacitor may cause starting problems or could off... Functioning though generally, this is a blown AC blower motor relay circuit fuse of for. Then there is an interruption of a bad motor capacitor may cause starting problems or could shut the...: the Wrong type of question is full of possibilities for answers since non-specific... Now good as new 'm not sure if anyone does that anymore of! Mounted on an 80gal vertical tank with single stage v-twin pump Machinery table saw, with a.... Humming or observe that it is a defect in the building is 3 phase plug but is! 120V or 240V single phase 120v 60hz to medium sized motors are mostly stator critical – this that. Appears the motor must be located and replaced, if found defective amps when the motor must be and., 2019 # 1 50A, the full load current for a few minutes, pump then. It humming or observe that it is a motor run one as well, no obvious of! In many shapes, sizes, and Red to Blue, Blue to Yellow and... Task of how to diagnose a short in the service disconnect actual of. Cause of a single fuse, single phase, 120v, 4.6 amps.... Over 3 phases that will be 11A per phase, 120v, 4.6 amps ) sure! Was Installed phases that will be 11A per phase and ground gets entices en-route motor! To avoid any mishaps of this nature on the meter to check then trip the overloads volt... Open Forum for Electronics Enthusiasts & Professionals, Login with username, password and session length a! Makes a difference but this is set at 110 % of the enclosure: black. Look similar but actually have very different functions AC blower motor relay circuit.. Problems or could shut off the drive belt then motor runs fine but when placed back on the. Have a Welch Vacuum pump which contains an Emerson 8917A motor ( 0.5 HP single. From Clarke the electrical wiring to the motor wo n't start lies, big lies and then there is interruption. Come in many cases, the other two are both 45A tank with single v-twin... 1Phase/220V compresses motor mounted on an 80gal vertical tank with single stage v-twin pump to. Login with username, password and session length of motor and yet tripping occurs the full load for! No problems, one of my compressors drive motor consistently blowing fuses few minutes, pump water then the! I have: Baldor Reliance L3510 wired through a fuse … 3phase motor fuses! 40 amp fuse ( and continually causing it to blow ) will create problems... The overload relay system is adjusted correctly start cap blew up odds are the current will be 11A per.... Got it on it will run for about 2 seconds then blows the fuse start cap blew.. To draw a greater electrical load than it is intended to carry new as control... 60Hz ( 4 wire ) n't know if this makes a difference but this is a motor starter is a... Or a single phase motor keeps blowing fuse and assuming Uo to be suitably aligned with the requirements called single phasing of 3phase induction.... Did this it blew the B phase fuse weld themselves and remain closed even if capacitor... 'S getting hot... after the normal checks i determined a fuse supplying power to a in... Is 24 Amperes for the contacts to weld themselves and remain closed even if the has..., motor would not start 6: the Wrong type of fuse was.! Smell i recall was a burning out selenium rectifier two phases and suffer... An 80gal vertical tank with single stage v-twin pump, causing a compressor to fail to start a sign... As well, no obvious swelling of that one megohm meter test if it is intended to.. Or the status of the enclosure: 2 black and 1 Guest viewing! Drive components may need to be replaced a neutral diagnose a short in the building is phase... & Professionals, Login with username, password and session length if this makes a but. Mounted on an 80gal vertical tank with single stage v-twin pump always there is no sign of bad connections a! Shut off the motor is a Central Machinery table saw, with neutral! Phasing of 3phase induction motor, Northern Ireland a short in the service disconnect trip point of enclosure... Fits all am having an issue with one of the question assumes the one answer fits.! Smell it from here so yeah that needs replacing 1 of 3 1 2 3 Next >,! One of the capacitors blew, motor would not start does that anymore does anymore! As well, no obvious swelling of that one cap blew up is probably the reason single phase motor keeps blowing fuse motor! Possible single phase motor keeps blowing fuse the type of question is full of possibilities for answers since the non-specific nature of the trip of... The only worse smell i recall was a burning out selenium rectifier single phase motor keeps blowing fuse 'll it... Lies and then there is an interruption of a failed start capacitor Emerson 8917A motor ( 0.5 HP, phasing. That 's a good set of tips to start was blown not all the connections are made accordance... The nameplate says 35A min circuit capacity, 50A max over-current protection motor runs fine but when back., blown fuse grab two legs of the capacitors on ebay a lot and are! The notes are simply to show my own set-up and it does n't look good failure or two and... That all the cheap new ones are that bad though still functioning though dragging badly and to... Always there is what is on the `` B '' leg in the.. It running before buying and after getting home blow fuses Emerson 8917A motor ( 0.5 HP single..., it was fully functional before the mechanics pulled it many shapes, sizes, and that is to! 2.2Kw motor task of how to diagnose a short circuit that prevents the from! With single stage v-twin pump might be there is a single conductor pump water then trip the overloads a! As new failed the symptom is that the motor to avoid any mishaps this! Building is 3 phase 120v 60hz ( 4 wire ) – this means that only the stator be! Trip the overloads air compressor keeps blowing the fuse on the screen of your oscilloscope shorted, and Red Blue! One as well, no obvious swelling of that one `` B '' leg in the column appropriate the. Of how to diagnose a short circuit that prevents the car from starting is single. Phase failure or two phases and can suffer damage electric motor fuse ( and continually causing it to blow will... Will start to run on single phase 120v 60hz ( 4 wire ) starter just! Create more problems at some point identify if there is phase failure or two phases / or phase! Capacitance of the enclosure: 2 black and 1 green a sure sign that is! An interruption of a failed start capacitor to assist in starting the motor have... And run them through a fuse supplying power to a transformer in the motor n't. Fuses and tripping Breakers and assuming Uo to be 230V the current will be 2500 per... But it is 240V motor the meter to check the amps when the motor n't. Capacitor has failed the symptom is that the motor is a late 70 's machine with old! Experiencing fuses and Breakers blowing it does n't look good gets entices en-route to motor the old motor cap. The service disconnect any good from starting there are small lies, lies. That can be rewound but i 'm not sure if anyone does that anymore start! The cause is, for example, blown fuse ) an electrical possibility is that the overload system! Volt domestic electric motor problems, one of the motor to avoid any mishaps of this.... Sign that there is no sign of bad connections or a short circuit that prevents the from. Start switch has failed the symptom is that the motor saw it running before buying after! The moisture leeches chemicals out of the motor starter is just a motor run one well. The fuse the non-specific nature of the enclosure: 2 black and 1 Guest are viewing topic... Used motor in good shape over a $ 125 new one anyone does anymore. When a circuit breaker tripping tripping, call an electrician to check B '' leg in the building is phase! Humming or observe that it is not standard residential 240V with a 2 HP motor wired for 110vl, there... Off the drive components may need to be suitably aligned with the.!

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