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Changing The Way Surplus Motors Are Sold.
Pre-Certified Electrically OK
Our Pre-Certified Electrically-OK Surplus is visually inspected for damaged frames or welded footings (previous welds, cracks, etc.), punch marks from previous repairs.
If the motor is ball bearings, the motor shaft is turned to see if it rotates and turns freely. The motor windings IR is checked to ground, with a minimum acceptance reading of 3 megohms for 230 or 460-volt. and 25 megohms for 2300 and 4160volt motors. This testing is performed at 1000v. D.C. for 460-volt motors and 5000 volts D.C. for 2300 and 4160-volt motors.
**NOTE** Windings are washed and baked when necessary.
Motor will be completely disassembled and visually inspected for broken or missing parts, as well as any visual defects in the stator iron or rotor. We take extra steps to ensure your receiving a good winding by performing a surge test on the stator windings. The rotor will be inspected for loose, open or bent rotor bars and any signs of defective end rings. Then an open rotor (single phase) test as well a growler test is performed on rotor.
Prior to reassembly of the motor the stator core is “core loss” tested. This will ensure no hot spots or damaged iron/core. After all electrical tests are performed and recorded, the unit will be reassembled and prepared for shipment.
All testing is documented and provided to customer for approval prior to shipment. The motor name plate and critical mounting dimensions are confirmed to match as quoted or per customers’ purchase order. See Pre-Certified Electrically OK Inspection Form here.