Siemens SINAMICS S120 Manual page 500

DC link components
8.3 Braking Module Booksize Compact
Rapid discharge
Furthermore, the Braking Module Booksize Compact can be used with a braking resistor to
quickly discharge the DC link. 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 Motor Module and/or motor
installation (reduction of the discharge time).
NOTICE
Damage to the Motor Module or connected motors for a fast discharge
For a fast discharge, the Motor Module or the connected motors can be damaged.
• For a rapid discharge, fully disconnect the drive system from the line supply.
• The motors must be at a standstill.
Danger to life when live parts are touched after rapid discharge
On completion of quick discharge, a voltage of 30 V is still present at the DC link. If quick
discharge is canceled before it has been completed, this voltage can still be more than
60 V. Touching live components can result in death or severe injury.
• Check the DC link to ensure that it is in a no voltage state before starting any work.
Cooling methods
The Braking Module Booksize Compact can be operated with the following cooling methods:
● Internal air cooling
● Cold plate cooling
The required cooling method is set using the DIP switch The factory setting is "internal air
cooling".
Internal fan
When the Braking Module is being used with internal air cooling, the internal fan starts up
immediately and is subsequently controlled by the temperature.
If the DIP switch is set to cold plate cooling by mistake, the fan will still start up when a
certain temperature threshold is reached, in order to prevent the Braking Module shutting
down due to overtemperature. If this threshold is exceeded, an alarm is issued via the digital
output "Prewarning". This ensures that an emergency stop can be performed if necessary.
500
WARNING
Booksize Power Units
Manual, (GH2), 07/2016, 6SL3097-4AC00-0BP8