1. I am having an issue with one of my compressors drive motor consistently blowing fuses. EVERY SIX MONTHS . 5. See that oil rings turn with shaft. 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?? However, it may be required to continually check on the future voltage that is being supplied to the motor. When too many appliances or light fixtures are operating at the same time, the internal sensing mechanism in the circuit breaker heats up, and the breaker "trips," usually by means of … A little back ground, the drive motor is a Baldor Super E industrial motor running 230v 3 phase 15hp 60 hz. I have a 3 phase press machine that operates a 230v motor. ? It occurs when a circuit is attempting to draw a greater electrical load than it is intended to carry. A phase failure is an interruption of a single conductor. 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. The open is usually caused by a blown fuse, an open contactor, a broken power line or bad connections. See that exposed shaft is free of oil and grease from bearings. Examine the starter switch, fuses, and other controls; tighten loose connections. In a three phase motor, which are most commonly used for commercial purposes, the amount of power drawn by a motor must be equal from all the phases. The cause is, for example, blown fuse. When a three phase motor looses one of the phase supply voltage then it is called Single Phasing.Single Phasing a case when any one phase out of the three phases fails. This motor is driving a Quincy 390 2 stage reciprocating compressor, the compressor is in great running order. If the main fuse is blown, DO NOT apply power to the motor until you have replaced defective fuses and checked for any ground faults in the motor and its wiring. Small to medium sized motors are mostly stator critical – this means that only the stator can be damaged. Winding single-phased (delta-connected) A single-phased winding failure is the result of an open in one phase of the power supply to the motor. 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. 3. Since one of the phases is now disconnected, current through other two phases will increase to produce the desired torque. i have a 3 phase 480v fan motor that keeps blowing fuses. Phase failure. I replaced the motor cause an electrican checked the unit and power up to unit and said it was good. Three phase motors will not start on single phase current. See that the motor is brought up to speed in normal time. 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. 6. Indicated by blown fuses. 4. Overloaded Circuit . With individual fuses on each phase, it is just three, single phases (120deg from each other in order), so when L1s sinusoid is swinging negative, L2 is still in the positive. An overloaded circuit is the most common reason for a circuit breaker tripping. Any imbalance can cause … Well water pump diagnostic FAQs set#4: water pump blows fuse or trips circuit breaker. The motor then continues running with two phases and can suffer damage. A short between the two multiplies the current flowing BACK through the fuse of L1. 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