Siemens SINAMICS S120 Combi Equipment Manual page 176

DC link components
7.2 Braking Module Booksize
Rapid discharge
Furthermore, the Braking Module can used with a braking resistor to quickly discharge the
DC link capacitors The DC link is discharged in a controlled manner via the braking resistor
once the infeed unit has been switched off and the line-up has been disconnected from the
line supply (e.g. via the main switch or line contactor). The function can be activated via a
digital input on the braking module. A quick discharge makes sense, for example, when
maintenance tasks are to be performed at the S120 Combi and/or motor installation
(reduction of the discharge time).
Danger to life when live parts are touched after rapid discharge
After rapid discharge or if discharge is interrupted, a hazardous voltage can still remain.
Death or serious injury can result when live parts are touched.
• Check that it really is in a no-voltage condition, from phase conductor to phase
NOTICE
Material damage during fast discharge due to overvoltages
Existing voltages can damage the rapid discharge system.
• Fully disconnect the drive system for rapid discharge from the line supply.
• The motors must be at a standstill.
Monitoring functions
● Automatic detection of braking resistors and braking power monitoring
● I
● Temperature monitoring of the Braking Module
● Short circuit and overload detection
● Ground fault detection
176
WARNING
conductor and phase conductor to protective conductor.
t monitoring of the braking resistors
2
SINAMICS S120 Combi
Manual, (GH9), 07/2016, 6SL3097-4AV00-0BP5