Braking Module Booksize Compact; Description - Siemens SINAMICS S120 System Manual

7.2

Braking Module Booksize Compact

7.2.1

Description

The Braking Module Booksize Compact is always used together with a braking resistor. It has the
following tasks:
• Controlled stop of the drives in the event of a power failure
(e.g. emergency retraction or EMERGENCY OFF Category 1).
• Limit the DC link voltage for brief generator operation, e.g. if the energy recovery capability
of the Line Module is deactivated or is not adequately dimensioned.
The Braking Module includes the necessary power electronics and control. When the module is
in operation, the power which is fed back into the DC link is dissipated via an external braking
resistor.
The Braking Module can be operated on 200 V or 400 V line supply systems; the 4-pin DIP switch
on the top of the module is used to select which one applies in each case. The factory setting is
400 V.
When spacers (6SL3462-1CC00-0AA0) are used, the Braking Module Booksize Compact can be
integrated into a drive line-up in booksize format with internal air cooling.
External braking resistors
Braking resistors can be operated with and without thermostatic switch at the Braking Module
Booksize Compact. The DIP switch sets the type of braking resistor being used in each case. The
factory setting is "braking resistor with a thermostatic switch".
The cable length between the Braking Module and the braking resistor is limited to 10 m.
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).
Electric shock when live parts are touched after a rapid discharge
On completion of quick discharge, a voltage of 30 V is still present at the DC link. If the fast
discharge is interrupted before it has been completed, then this voltage can 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.
High Frequency Drive
System Manual, 10/2020, 6SL3097-5AH10-0BP0
WARNING
Braking Modules
7.2 Braking Module Booksize Compact
105