In this article explain how to identify in case that the motor on warp knitting or warping machines were defect or suspected to defect.
Electrical maintenance personnel have for years been limited to troubleshooting with no more than a multitester and a megger. This unfortunately does not provide enough information to allow most electricians to feel totally confident in determining the problem on the warp knitting machines or warping machines if an electrical problem exists or not.
Sometimes I heard on the many client when some warp knitting machine or warping machines stop due some problem which not yet knows, whether the machine stop cause of electric problem or the mechanical side,the mechanic technician said,"it must be an electrical problem !",and other electrician said,"its must be a motor",whatever this motor of main drives or the other motor on the EBA system for the beams drive.
This has been an on-going battle and, up to recently,
Vibration shows a two times line frequency (2FL) spike and that must mean it’s electrical. Right?... Wrong!!!! There are so many variables producing a 2FL today that removing a motor from service for an electrical repair due only to a high 2FL is a mistake. Possibly an expensive one. The best thing you could hope for is that the repair facility will call back asking "what do you want done?" to this perfectly good motor.
"RESISTANCE to ground or megger testing is all we need." I find this statement hard to believe. How many times as an electrician have we been nervous restarting a tripped motor after verifying with our trusty megger that, "The motor is fine." The fact is, numerous reasons can exist which causes a motor to trip that will not be seen by a megger, such as a turn to turn short. Breakdown in the insulation between individual turns of a winding can occur inside a stator slot or at the end turn and be completely isolated from ground. Phase to phase shorts can occur the same way. If these faults are left unattended, they can result in rapid deterioration of the winding, potentially ending in a complete motor replacement. Restarting of a motor that has tripped should be considered only after these faults have been factored out.If not can be lead to damage the others parts behind the motor i.e : the inverter!
