Siemens SINAMICS S120 Equipment Manual page 385

For this reason, you must take the following safety precautions when carrying out work on
the Cabinet Module after the DC interface has been switched off:
● Observe the "five safety rules" for all electrical work:
● Only commission qualified specialists to carry out the work.
● Verify that the equipment is de-energized at the measuring points provided in the cabinet
● Check that there is no voltage on the motor connections.
● You must avoid coming into contact with the DC busbar when replacing a power block.
● When replacing components, make sure that no screws or small parts fall into the
● Remove the fan fuse and fuse for the 24 V DC power supply.
NOTICE
You must observe the applicable legal regulations when carrying out all work.
The following figures show the location of the voltage source once disconnected from the DC
busbar and the associated measuring points to verify isolation from the supply in the Cabinet
Module.
S120 Cabinet Modules Equipment Manual
Manual, (GH5), 10/2008, A5E00427098A
8.20 L37, DC interface incl. pre-charging input circuit for the relevant DC link capacitance
– Disconnect from power supply.
– Protect against reconnection.
– Make sure that the equipment is de-energized.
– Ground and short-circuit.
– Cover or enclose adjacent components that are still live.
(see figures below).
cabinet.
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