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Electrical Inspection & Testing Forum
I.R Test on an Isolated Motor on a live working Industrial Machine
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<blockquote data-quote="Marvo" data-source="post: 416180" data-attributes="member: 20838"><p>You won't cause damage to the controls if the motor is isolated locally and you IR test it. Connect the 3x lives together in the motor termination box and IR test between them and the frame of the motor. Earthed metalwork will by definition remain at 0V wrt earth or ground.</p><p></p><p>If the chassis of the motor is earthed ie the CPC is still connected then people in the area cannot get shocks from faults or testing voltages.</p><p></p><p>The thermistors are in physical contact with the windings but they're not in the path of the running current so test as I mentioned above and don't apply IR test voltages to any thermistor wiring in the terminal box.</p><p></p><p>If there is running machinery or live voltages in the vicinity of where you're working do a quick method statement for your proposed work then a risk assessment. Just be aware of the additional risks and manage them appropriately.</p></blockquote><p></p>
[QUOTE="Marvo, post: 416180, member: 20838"] You won't cause damage to the controls if the motor is isolated locally and you IR test it. Connect the 3x lives together in the motor termination box and IR test between them and the frame of the motor. Earthed metalwork will by definition remain at 0V wrt earth or ground. If the chassis of the motor is earthed ie the CPC is still connected then people in the area cannot get shocks from faults or testing voltages. The thermistors are in physical contact with the windings but they're not in the path of the running current so test as I mentioned above and don't apply IR test voltages to any thermistor wiring in the terminal box. If there is running machinery or live voltages in the vicinity of where you're working do a quick method statement for your proposed work then a risk assessment. Just be aware of the additional risks and manage them appropriately. [/QUOTE]
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