Chapter 9 Maintenance and Repair
106
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Voltage withstand test can not be arbitrarily implemented, it will reduce the life of
inverter. Insulation test can be made with the 500-volt megger before using, the
insulation resistance shall not be less than 4MΩ.
9-4.Measuring and readings
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If a general instrument is used to measure current,imbalance will exists for the
current at the input terminal. generally, the deviation is not more than 10%, that is
normal. If the deviation exceeds 30%, please inform the original manufacturer to
replace rectifier bridge, or check if the deviation of three-phase input voltage is
above 5V or not.
If a general multi-meter is used to measure three-phase output voltage, the reading
is not accurate due to the interference of carrier frequency and it is only for reference.
