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P0 <br />P01111tion 582-1, Happy Hollow Rd Suite I -B <br />Control, M i Iford, 0H 45 15 0- 1 830 <br />Tel: (51 3) 831-I 165 Fax: 15 13) 965-481-' <br />vSte-ins IncF; ri;ail: fIconsysC at)l.eont <br />www,PoIlut.ic:7;iC(ai)tro ]S}'steni,coiii <br />Electrical Trouble Shooting <br />Trouble Shooting Motor Controls <br />The following table lists the major causes of trouble encountered with motor controls <br />and the suggested remedies. If physical damage or broken parts cause a device to not <br />function properly, this problem is usually obvious and parts can be replaced quickly. <br />However, the cause is generally not so apparent and a thorough inspection is often <br />necessary. By referring to the table when trouble arises, you will be better able to <br />correct the difficulty, and to insure the best service from the controls. Motor controls <br />are inspected and checked in the factory prior to delivery, and are seldom defective <br />when shipped. When inspecting or repairing motor controls BE SURE POWER IS OFF <br />AND KEEP ALERT. Become familiar with the various circuits and operation of the <br />particular controls. Use padlocks, test instruments, etc. <br />Note: The expected mechanical life of a control should be measured in number of <br />operations; not in age of control or length of time installed. <br />------------------------------------------------------------------------------------------------------------- <br />CONTACTS: All stationary & movable contacts & contact springs must be replaced. Be <br />sure switch mechanism operates without binding of magnet structure or movable <br />contacts. If binding occurs replace whole switch. <br />COILS: Coil problems are often result of other difficulties. Once difficulties are <br />corrected it is advisable to replace coil. <br />Trouble <br />Cause <br />Remedy <br />Open Circuit <br />1. Mechanical damage. <br />1. Handle and store carefully. Do not <br />handle coils by the leads. <br />2. Burnt-out coil due to <br />2. Replace coil. <br />over -voltage or defect. <br />Overheated Coil <br />1. Over -voltage or high <br />1. Check application and circuit. <br />ambient temperature. <br />2. Wrong coil <br />2. Check rating (voltage & frequency) <br />if incorrect replace with proper coil. <br />3. Shorted turns caused <br />3. Replace coil. <br />by mechanical <br />damage or corrosion. <br />4. Under voltage, failure <br />4. Correct system voltage. Install new <br />of magnet to seal in. <br />j coil. <br />5. Intermittent duty coil <br />5. Check application. <br />energize too long. <br />