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Maintenance
9.3 Opening the doors
Electric shock if the grounding switch is defective
A grounding switch is a component that has an associated certain probability of failure. This
means that it is possible that the feedback signal regarding the switching state no longer
matches the actual switching state of the grounding switch. This means that if the power unit
door is open, hazardous voltages could still be present at the active parts of the drive.
Touching the device can result in death or serious injury.
● Check the function of the grounding switch before carrying out any other work at the drive.
● Carefully comply with the 5 safety rules (Page 15).
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 clockwise direction.
3. Withdraw the socket wrench.
Figure 9-4
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
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.
140
WARNING
The contacts are closed and the DC-link voltage is grounded.
Make-proof-grounding switch closed
SINAMICS SM150 6SL3845-7NN46-7AA2
Operating Instructions Rev.201910281345 EXAMPLE
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