Insulation Monitoring; Commissioning - Siemens SINAMICS DCM Compact User Manual

3.2.6

Insulation monitoring

In ungrounded low-voltage networks, an insulation monitor is used to monitor the insulation
resistance to ground. This measures the current flowing across an established series
resistor. For this purpose, a measuring voltage is injected into the network against the PE
conductor. If the value falls below an adjustable threshold value for the insulation resistance,
an alarm is output.
Since the network on the DC voltage side is galvanically connected via the parallel
connection of the two partial converters, only one insulation monitor can be used to monitor
the network and DC voltage side for ground faults.
Table 3- 1
Rated network voltage
Up to 690 V
Up to 1000 V
Up to 1300 V
3.3

Commissioning

In principle, all converters should be commissioned as described in the Commissioning
chapter of the SINAMICS DCM DC Converter operating instructions.
The settings in chapter Specifying the operating mode (Page 22) and chapter Additional
parameter settings (Page 23) should be made
commissioning (Page 24)).
To make the settings, use
● BOP20 operator panel
● AOP30 operator panel: Parameter list
● STARTER commissioning tool: Expert list.
12-pulse applications
Compact User Manual, 09/2015, A5E34871844H
Possible devices for insulation monitoring:
Type
MR627
IRDH 275/IRDH375
MR627 with MZ611
IRDH 275/IRDH375 with AGH 150W-4
IRDH 275/IRDH375 with AGH 204S-4
12-pulse parallel connection
Manufacturer
AREVA T&D/ALSTOM
BENDER
AREVA T&D/ALSTOM
BENDER
BENDER
before
commissioning (chapter Carrying out
3.3 Commissioning
21