An electrical circuit breaker is a switching device that can be operated automatically or manually for controlling and protecting the electrical power system, and the electrical devices connected to it. Can a bad start capacitor be the culprit? This is a rough diagram of how it is setup. GM. 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 following schedule, which covers both ac and dc motors, is based on average conditions insofar as operational use and cleanliness are concerned. A forum community dedicated to professional electricians, contractors, and apprentices for residential and commercial work. Clean out magnetic dirt that may be clinging to poles. 8. Check brushes and replace any that are more than half worn. It is a power press of sorts. 14. 5. Over the years the protective devices have been selected according to the applicable code requirements with only minimal nuisance tripping. This implies that the three line voltages are also equal; a situation that rarely exists in practice. 7. Well a fuse is not ideal method of overcurrent protection in three phases motors, the obvious reason is they are expendable and if you have Nuisance trips can be just that a nuisance. ? So there is a piece of equipment that routinely blows fuses. What’s the Difference Between AC and DC Electric Shocks? i have a 3 phase 480v fan motor that keeps blowing fuses. 6. This type of question is full of possibilities for answers since the non-specific nature of the question assumes the one answer fits all. VerticalScope Inc., 111 Peter, Suite 901, Toronto, Ontario, M5V 2H1, Canada. Faults, in general, occur … In the case of HVAC blowers and compressors, this additional heat ends up in either the refrigerant or the air which must then be removed, further decreasing efficiency. 6. Follow the steps below to check for the most common problems for three-phase motors. (Where dust and dirty conditions are extremely severe, open motors may require a certain amount of cleaning every day.). Examine the starter switch, fuses, and other controls; tighten loose connections. It always blows Fuse A. Small to medium sized motors are mostly stator critical – this means that only the stator can be damaged. When a 3-phase motor expirience phase failure, what a mess… (photo credit: mawdsleysber.co.uk) Equipment manufacturers’ specifications and procedures should be consulted and followed. A small variation in voltage of, say, 2 per cent can cause a current variation of about 10 to 15 per cent. Periodic inspections prevent serious damage to machinery by locating potential trouble areas. For example, if the main fuse is rated at 100A, with 10 feeders … ), 2) the percentage of the day the motor operates, 3) the nature of the service, and 4) the motor’s environment. Systematic and periodic inspections of motors are necessary to ensure best operating results. Sulphur Hexaflouride (SF6) Circuit Breakers. how to calculate cable size for electrical works, How to calculate KVAR for capacitor bank design, How to calculate short circuit current for transformer. I have a 3 phase motor that phases and blows fuses. A little back ground, the drive motor is a Baldor Super E industrial motor running 230v 3 phase 15hp 60 hz. Turn on the motor. This is a commercial setting. Examine the starter switch, fuses, and other controls; tighten loose connections. Record the peak amperage. Well water pump diagnostic FAQs set#4: water pump blows fuse or trips circuit breaker. One of the first symptoms of a bad or failing AC blower motor relay is a blown AC blower motor relay circuit fuse. The correct answer requires a specific condition and circumstance. 10. This motor is driving a Quincy 390 2 stage reciprocating compressor, the compressor is in great running order. Any imbalance can cause a problem. If the voltage is good, go to Step 2. However, it may be required to continually check on the future voltage that is being supplied to the motor. Since one of the phases is now disconnected, current through other two phases will … If the breaker trips when the motor starts, the peak draw is the problem. This article series answers frequently-asked questions about how to diagnose problems with the water pump bring well water to a building or boosting water pressure at a building. The cause is, for example, blown fuse. Check clearance between shaft and journal boxes of sleeve bearing motors to pre vent operation with worn bearings. There are two ways to get all three fuses "at once". Going to start looking for problem Monday but did have time to do some voltage checks before closing for weekend. Most electrical equipment requires planned inspection and maintenance to keep it in proper working condition. How Alternator is working? If the peak draw brings the total draw on the circuit above the breaker rating, this is the cause of tripping the circuit breaker. Hi gerty, the machine has been running with that fuse until it started to blow it at motor startup. That´s how I discarded a motor issue. I replaced the motor cause an electrican checked the unit and power up to unit and said it was good. 5. I've checked for a short and there is not any continuity between the line in and motor case. Single phasing can occur as a result of a fuse blowing or a protective device opening on one phase of the motor. See that the motor is brought up to speed in normal time. If your air conditioning system is blowing fuses or causing your home’s electrical system to short out, contact the team at … 3 Phase Voltage Imbalance Voltage imbalance is a motor killer. The monitoring relay is used for continuous monitoring of fuses against blowing out or inadvertent removals and may cause incorrect tripping. When one phase of a three-phase system is lost, a phase loss occurs. The motor then continues running with two phases and can suffer damage. The other is that there was enough leakage to ground from all three phases that each fuse saw and cleared the fault independently around the same time. I think, (name plate is hard to read,) it's an 8 or 10 hp motor. Other possibilities include feeder or step-down transformer fuses blowing. Motors are usually protected by both fuses (or circuit breakers) and by heater coils in a magnetic starter. Examine connections of commutator and armature coils. and cant figure out why the motor is 1.5 hp 1160 rpm 480 motor with three 6 1/4 amp fuses and i megged all wires and everything is good anyone have any ideas?? A three-phase electric motor operating under ideal conditions will draw three equal phase currents. 1. If the fan begins to overheat it can often result in a repeated breaker trip until the motor has been serviced. They also reveal faulty operating conditions, such as misapplication or poor drive engineering. Your email address will not be published. Same fuse, same spot everytime. Check grease in ball or roller bearings. In a good preventive maintenance program with detailed checks, the person in charge should have a record card on file for every motor in the plant. Ground Fault. 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