Chapter 8 Maintenance and repair
68
Voltage
AC 380V
Inverter
R
S
T
Figure 8- 1 380V Drive equipment charging circuit example
8-5.Measuring and readings
※ 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.
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