Siemens SINAMICS SM150, Operating And Installation Instructions

Page: 160 / 218

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.
The door of the closed-loop control cabinet is not electromechanically interlocked. For this
reason, it can also be opened during operation.
9.3.1 Opening the power unit doors for maintenance work
Opening the doors of the power unit
The doors can only be opened under the following conditions:
● The DC-link voltage is below a threshold value of 60 V.
● The circuit-breaker is open.
● The make-proof grounding switch is closed. The make-proof grounding switch is enabled
by the software.
● With synchronous motors, the field contactor must return the external enable signal at the
input with the status "OFF".
Maintenance
9.3 Opening the doors
SINAMICS SM150 6SL3845-7NN46-7AA0
160
Operating Instructions 04/2017