Ground Fault Detection - Siemens SINAMICS GL150 Operating Instructions Manual

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Figure 3-10
3.3.3.5

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.
SINAMICS GL150 6SL38555UN113KA0Z
Operating Instructions Rev.201910281450 EXAMPLE
AVT combination modules
Transformer
Measuring resistors
Surge suppressor
80 kHz power supply
Overview of the voltage sensing circuit
Description
3.3 Power unit
43