Important Safety Precautions - Siemens SINAMICS S120 Manual

8.32.3.1

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:
Hazardous electrical voltage
Once the DC busbar and the Motor Module have been disconnected using the DC interface
(-Q7), the following voltages may be present in the Cabinet Module:
 Up to 1200 V on the DC busbar (protected against accidental contact)
 Line voltage (380 to 480 V 3 ph. AC or 500 to 690 V 3 ph. AC) via the auxiliary power
 Up to 230 V AC on the optional mounting locations
 24 V DC on the auxiliary power supply system (electronics power supply)
 On motor connection -X2 (e.g. regenerative voltage due to residual speed)
Hazardous electrical voltage
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 5 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.
Cabinet Modules
Manual, 03/2013, A5E03263538A
8.32 L37, DC interface incl. pre-charging input circuit for the relevant DC link capacitance
DANGER
supply system or 230 V 2 ph. AC downstream of the transformers for the fan supply
WARNING
– 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.
Options
489