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Description
3.3 Power unit
①
②
③
④
⑤
Figure 3-6
3.3.2.4
Ground fault detection
The insulation resistance is monitored against two threshold values. Here, the voltage drop at
the resistors between ground and the following artificial neutral points is compared:
• Three-phase current input (line-side)
• Three-phase output (at the motor)
If the warning threshold is exceeded, an alarm is output. If the fault threshold is exceeded, an
alarm message is output and the converter is switched off.
34
AVT combination modules
Transformer
Measuring resistors
Surge suppressor
80 kHz power supply
Overview of the voltage sensing circuit
3rd Party LCI Control Upgrade
Operating Instructions, 02/2022, A5E31872818
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