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. In searching for a solution I have found this: The fuses are LPJ-30SP , it was fully functional before the mechanics pulled it. The notes are simply to show my own set-up. Thank you all, that's a good set of tips to start off with. 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. 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. Turbo, Mar 22, 2019 #4. 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. if all phases are available at motor end. I saw it running before buying and after getting home blow fuses. It occurs when a circuit is attempting to draw a greater electrical load than it is intended to carry. The actual source of the trip point of the relay must be located and replaced, if found defective. Power distribution in the building is 3 phase 120v 60hz (4 wire). It is possible that the compressor motor itself is the problem when your air compressor is blowing fuses-breakers. it locked up and fuse tripped. Use a clamp on the meter to check the amps when the motor is running to identify if there is an overload occurring. 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. I know that smell. MCB does not trip when this happens, always there is no sign of bad connections or a short in the cables. 2. Sawdust is a major killer of motor windings. Use a clamp on the meter to check the amps when the motor is running to … Many look similar but actually have very different functions. Locate motor nameplate FLA in the column appropriate for the type of motor and type of protection required. Cause 6: The Wrong Type of Fuse Was Installed. Help with a single phase 2KW motor that's blowing fuses, Re: Help with a single phase 2KW motor that's blowing fuses. An overloaded circuit is the most common reason for a circuit breaker tripping. Check voltage before the secondary fuses. Verify the motor phases have continuity from phase to phase for all combinations using a multimeter from the motor starter. Its on an exhaust fan. Monitor it and if it keeps tripping, call an electrician to check. Compressor motor keeps blowing fuses. The compressor is a 230 volt, 10 Amp 2.2Kw motor. A phase failure is an interruption of a single conductor. 1 Horsepower. It will run for about 30 min in hot weather then … It’s a 5hp GE 1phase/220v compresses motor mounted on an 80gal vertical tank with single stage v-twin pump. I think I'd be inclined to find an old used motor in good shape over a $125 new one. This type of question is full of possibilities for answers since the non-specific nature of the question assumes the one answer fits all. One model of compressor motor start capacitor I have a 1/2 HP motor that can be wired either 120V or 240V single 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. No. 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. I found it with this fuse configuration which makes me wonder if this has been a problem before. In many cases, the drive components may need to be suitably aligned with the motor to avoid any mishaps of this nature. The notes are simply to show my own set-up. Power distribution in the building is 3 phase 120v 60hz (4 wire). It is 2.2KW. If I turn it on it will start to run for about 2 seconds then blows the fuse. 1.) The fuse that has been blowing is a 50A, the other two are both 45A. 3) An electrical possibility is that the motor has an open phase. The motor problem may be that the windings have shorted, the capacitor wires have come loose, or the motor is just plain wearing out. Small to medium sized motors are mostly stator critical – this means that only the stator can be damaged. 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. Yeah that smell is one of the worst smells ever, it permeates everything, handle it and your hands will still smell the next day. If the capacitor has failed the symptom is that the motor won't start. Might be there is phase failure or two phases / or a phase and ground gets entices en-route to motor. It keeps blowing the fuse on the "B" leg in the service disconnect. 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 Overloaded Circuit . Consider this issue if you are experiencing fuses and breakers blowing. 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. You may hear it humming or observe that it's getting hot. Mannyroad Member. I don't know if this makes a difference but this is a late 70's machine with all old stuff. 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. Fortunately those motors are common as can be. Overheating is a primary cause of a failed start capacitor. You didn't say what the horsepower of the motors was, or the status of the convryor's loading. If the capacitor has failed the symptom is that the motor won't start. Check voltage after primary fuses. ... NEC Table 430.248, the full load current for a 2 HP, single phase motor is 24 Amperes. Forty amps of current is a lot and odds are the current surge that popped the fuses far exceeded 40 amps. Phase failure. This is the complicated task of how to diagnose a short circuit that prevents the car from starting. 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. I grab two legs of the 120v and run them through a fuse … Basic construction and working of a DC Generator. The nameplate says 35A min circuit capacity, 50A max over-current protection. Amps: 12.4. It just had bad bearings. It's possible for the contacts to weld themselves and remain closed even if the centrifugal mechanism is still functioning though. 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. It has been blowing a single fuse, single phasing then dropping out on overloads. Fuses come in many shapes, sizes, and configurations. 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. One of the first symptoms of a bad or failing AC blower motor relay is a blown AC blower motor relay circuit fuse. 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. A bad motor capacitor may cause starting problems or could shut off the motor while running. The cause is, for example, blown fuse. my guess is the start switch has failed shorted, and that is probably the reason the old motor start cap blew up. Yikes, yeah that's bad. The 3 phase motor will not start and the the motor will burnt out due to flow of high locked rotor (short circuit) current. This is known as single phasing. Check Red to Blue, Blue to Yellow, and Red to Yellow phases. Use a clamp on the meter to check the amps when the motor is running to … Stripped the pump last month, sorted out the bottom end and pump is now good as new. It occurs when a circuit is attempting to draw a greater electrical load than it is intended to carry. This is called single phasing of 3phase induction motor. It is a Central Machinery table Saw, with a 2 hp motor wired for 110vl? The only worse smell I recall was a burning out selenium rectifier. 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. 10Hp equates to 7500 watts. These capacitors will occasionally fail, causing a compressor to fail to start. Calculations say the FLA is 2.255. There are three wires coming out of the enclosure: 2 black and 1 green. 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. 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. 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. "Why does my Motor keep blowing Fuses and Tripping Breakers? 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. Blown fuses. The first time it did this it blew the B phase fuse. Discussion Starter • #1 • Feb 7, 2015. Check voltage after the starter. Wiring Up a Brooke Crompton Single-phase Lathe Motor (Myford Lathe): Here are a few notes about wiring up my small lathe motor. The motor will come up to speed, run for a few minutes, pump water then trip the 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). Messages: 3,656 Location: Fermanagh, Northern Ireland. When I was a kid there was an old fashioned hardware store run by a family friend. Phase failure. Page 1 of 3 1 2 3 Next > Mannyroad, Mar 21, 2019 #1. It is also beneficial to make sure that the overload relay system is adjusted correctly. The electrical wiring to the motor must be verified to ensure that all the connections are made in accordance with the requirements. Verify the motor phases have continuity from phase to phase for all combinations using a multimeter from the motor starter. Heres what i have: Baldor Reliance L3510 wired through a distributor to run on single phase 120v 60hz. This is the complicated task of how to diagnose a short circuit that prevents the car from starting. Motor capacitors store electrical energy for the motor to use. The cause is, for example, blown fuse. Pump is recently new as is control switch/head bleed valve. 2. Jump to Latest Follow ... After the normal checks I determined a fuse supplying power to a transformer in the unit was blown. The fuses are LPJ-30SP , it was fully functional before the mechanics pulled it. Note that it is NOT standard residential 240v with a neutral. An overloaded circuit is the most common reason for a circuit breaker tripping. The unit is a 6ton, 240v 3ph. The motor will come up to speed, run for a few minutes, pump water then trip the overloads. it locked up and fuse tripped. It holds moisture and the moisture leeches chemicals out of the sawdust that attacks the insulation. 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 you replace it, you might consider a totally enclosed fan cooled motor. After 3yrs no problems , one of the capacitors blew, motor would not start. 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. A phase failure is an interruption of a single conductor. Amps: 12.4. Turbo Member. The chap had got it on a 3 phase plug but it is 240V motor. The motor is a 1.5 -2.0 HP Single phase 240 volt domestic electric motor . You can buy the capacitors on ebay a lot cheaper than from Clarke! 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. A used 220 volt motor should easily pass a 1000 volt megohm meter test if it is any good. Table Saw keeps blowing 20 amp fuse. Check Red to Blue, Blue to Yellow, and Red to Yellow phases. A friend of mine got a cheap 2HP motor a few years ago and it was crap, the thing ran hot and hummed loudly, he ended up finding a motor from the 1970s that didn't look as nice but it sure runs a lot nicer. 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. 1 Horsepower. Stripped the pump last month, sorted out the bottom end and pump is now good as new. 3) An electrical possibility is that the motor has an open phase. Took it apart today and it doesn't look good. The motor is a 1.5 -2.0 HP Single phase 240 volt domestic electric motor . Over 3 phases that will be 2500 watts per phase and assuming Uo to be 230V the current will be 11A per phase. 3.) 3 Posts . A Free & Open Forum For Electronics Enthusiasts & Professionals, Login with username, password and session length. Sounds like the fan motor is dragging badly and needs to be replaced. A damaged or burnt out capacitor may … This Instructable dea… 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. If I take off the drive belt then motor runs fine but when placed back on blows the fuse. Small to medium sized motors are mostly stator critical – this means that only the stator can be damaged. 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. 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. Yes there is a motor run one as well, no obvious swelling of that one. In the UK, where standard single phase is 240 v Motor is a twin capacitor type, 200MFD start cap, 30 MFD run capacitor. Generally, this is set at 110% of the total power capacity of the motor. The correct answer requires a specific condition and circumstance. I have just bought a wood working thicknesser. The motor then continues running with two phases and can suffer damage. It is a single phase induction motor, 3kw. You may hear it humming or observe that it's getting hot. Many single-phase compressors require a start capacitor to assist in starting the motor. 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.
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