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Maintenance tips Siemens NEMA contactors have a robust design and a rugged construction and thus do not require frequent maintenance . Nonetheless the following items can be added to your preventative maintenance program to help further ensure equipment protection and minimum unplanned down time. 1. Routine inspection: Inspection consists of observation for signs of overheating, dirt, loose parts, noise and any other signs of abnormalities. It will help to monitor the state of contactors. 2.Keeping the contactor clean will help eliminate overheating, high voltage leakage and breakdowns. Clean by blowing the dust and dirt away with a low pressure dry air stream. 3.Terminals: Tighten Terminals periodically because a) Connections have a tendency to loosen with time – particularly those of aluminum which is soft material b) Vibration may result in loose connections that will eventually cause problems. Note: Brittle or discolored wire insulation may be an indication of a loose connec...

Troubleshooting Tips for Electrical /Electronic Maintenance This section concentrates on the problems plaguing brand-new systems. In this case, failure modes are generally not of the aging kind, but are related to mistakes in design and assembly caused by human beings. Wiring problems In this case, bad connections are usually due to assembly error, such as connection to the wrong point or poor connector fabrication. Shorted failures are also seen, but usually involve misconnections (conductors inadvertently attached to grounding points) or wires pinched under box covers. Another wiring-related problem seen in new systems is that of electrostatic or electromagnetic interference between different circuits by way of close wiring proximity. This kind of problem is easily created by routing sets of wires too close to each other (especially routing signal cables close to power conductors), and tends to be very difficult to identify and locate with test equipment. Power supply problems Blown...