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1. Mechanical binding......................
Failure to pick up.
Failure to drop out magnet-operated device ...........
OVERLOAD RELAYS: Magnet-operated instantaneous-type, high trip or low trip.....
2.Gum or dirt on magnet faces...........
3.Worn bearings.........................
4.Nonmagnetic gap in magnetic circuit destroyed ...................................
5.Contact tip welded.....................
6.Voltage not removed...................
7.Not enough mechanical load on magnet, improper adjustment.....................
1. Wrong coil............................
Install coil with correct rating.
Test coil and replace if found defective. Clean parts with suitable solvent. See manufacturer's instruction sheet. Refer to manufacturer.
Change fluid and open vent slightly, or regulate temperature. Clean parts with suitable solvent. Replace and adjust. Replace.
Magnet-operated inverse-time type, slow type...............
Shorted turns (on high trip).............
Mechanical binding; dirt, corrosion, etc..
Assembled wrong.......................
Wrong calibration......................
Fluid too viscous, vent too small, or temperature too low...........................
2.Mechanical binding; dirt corrosion, etc. .
3.Worn parts.............................
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