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Further going in recently during a shut down, the operation run the DC ELOP. then after some time it got burnt completely with reasons unknown. so we have instantly isolated the circuitry and checked for the resistance and meggered the motor, which is showing body we have disconnected and placed a spare motor. but then again the replaced motor also after running for few min, we saw smoke coming from the motor so again the same we meggered and all. my question is
1.what would be possible reasons for the motor failure.
and to mention the second motor what we have replaced sent for overhauling where the tested the motor on test bench it was running fine. the same when we connected got burnt again. we have disconnected the terminals and checked for the incoming supply, ie field and armature. it was 220v dc. no abnormality noticed.
2. why is it twin speed motor (My interpretation on seeing the name plate) s2-15 min on high speed may be to reduce the load on the batteries and also when machine trips all the instantaneous oil pressure will be high and later it may get reduced.
3. for changing the direction is it like either the field windings or armature windings is sufficient or both should be changed.
Apologies of the length of the msg. I just want to be clear.
1.what would be possible reasons for the motor failure.
and to mention the second motor what we have replaced sent for overhauling where the tested the motor on test bench it was running fine. the same when we connected got burnt again. we have disconnected the terminals and checked for the incoming supply, ie field and armature. it was 220v dc. no abnormality noticed.
2. why is it twin speed motor (My interpretation on seeing the name plate) s2-15 min on high speed may be to reduce the load on the batteries and also when machine trips all the instantaneous oil pressure will be high and later it may get reduced.
3. for changing the direction is it like either the field windings or armature windings is sufficient or both should be changed.
Apologies of the length of the msg. I just want to be clear.