Power electronics have limited life and can show changes in performance and deterioration of performance after years of use in usual conditions. To help prevent these problems, it is important to do preventive maintenance and regular inspection, and replace parts on the drive.
Drives contain different types of power electronics, for example power transistors, semiconductors, capacitors, resistors, fans, and relays. The electronics in the drive are necessary for correct motor control.
Follow the inspection lists in this chapter as a part of a regular maintenance program.
Note:
Examine the drive one time each year at a minimum.
The operating conditions, environmental conditions, and use conditions will have an effect on the examination frequency for connected equipment.
Examine the drive more frequently if you use the drive in bad conditions or in these conditions:
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High ambient temperatures
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Frequent starting and stopping
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Changes in the AC power supply or load
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Too much vibration or shock loading
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Dust, metal dust, salt, sulfuric acid, or chlorine atmospheres
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Unsatisfactory storage conditions.