Dc Interface Incl. Pre-Charging For Booksize Cabinet Kit; Important Safety Precautions - Siemens SINAMICS S120 Equipment Manual

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8.20 L37, DC interface incl. pre-charging input circuit for the relevant DC link capacitance
8.20.3

DC interface incl. pre-charging for Booksize Cabinet Kit

8.20.3.1

Important safety precautions

The Motor Module can be serviced after it has been disconnected from the DC busbar via
the DC interface and after the capacitor discharge time has elapsed. However, the following
safety precautions must be observed:
Once the DC busbar and the Motor Module in booksize format have been disconnected by
means of the fuse switch disconnector (-Q7), the following voltages continue to be present
in the adjacent Motor Modules in booksize format in the Cabinet Module:
• Up to 800 V on the DC busbar (protected against accidental contact)
• Line voltage (380 to 480 V 3 AC) via the auxiliary voltage busbar system or 230 V 2 AC
• Up to 230 V AC via the auxiliary voltage busbar system or via direct infeed for SITOP
• 24 V DC via the auxiliary voltage busbar system (electronics power supply)
• On the motor connection (e.g. regenerative voltage due to residual speed)
The cabinet units are operated with high voltages.
All connection work must be carried out when the cabinet is de-energized.
All work on the cabinet must be carried out by trained personnel only.
Work on an open cabinet must be carried out with extreme caution because external supply
voltages may be present. The power and control terminals may be live even when the
motor is not running.
Due to the DC link capacitors, dangerously high voltage levels are still present inside the
cabinet up to five minutes after it has been disconnected. For this reason, the cabinet
should not be opened until a reasonable period of time has elapsed.
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.
● Ensure that no voltage is present at the measuring points provided in the cabinet.
● Check that there is no voltage on the motor connections.
● When working close to the DC busbar in the cabinet, take care to avoid any contact with
● 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.
392
DANGER
downstream of the transformers for the fan supply
and fan supply
WARNING
the DC busbar.
cabinet.
S120 Cabinet Modules Equipment Manual
Manual, (GH5), 10/2008, A5E00427098A