Siemens SINAMICS GM150, Operating And Installation Instructions, Page: 198 / 258

9.2.2 Grounding using a make-proof grounding switch
The drive is equipped with a make-proof grounding switch (in compliance with the requirements
of IEC61800-5-1, Section 4.2.13).
You can close the make-proof grounding switch when the doors are closed and only at a
voltage below 60 V. If the auxiliary voltage fails completely, the make-proof grounding switch
cannot be closed. It is not permissible that you open the doors before the make-proof grounding
switch is closed.
WARNING
DC-link short-circuit
A DC-link short-circuit can occur if grounding under voltage. This can cause injury and
material damage.
Remove the socket wrench before switching on. This activates the interlocking.
To close the make-proof grounding switch, proceed as follows:
1. Take the socket wrench found in the tool set.
2. Turn the socket wrench in the counterclockwise direction.
The contacts are closed and the DC-link voltage is grounded.
Figure 9-3 Make-proof-grounding switch closed
9.3 Opening the doors
The drive is equipped with a door interlocking system. Depending on the design, this is an
electromechanical door interlocking system or optionally a safety locking system.
Maintenance
9.3 Opening the doors
SINAMICS GM150 6SL3815-2LN41-4AA2
198
Operating Instructions 04/2017