Braking Module Booksize Compact; Description - Siemens Sinamics S120 Manual

DC link components

8.3 Braking Module Booksize Compact

8.3 Braking Module Booksize Compact
8.3.1

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 periods of generator operation, for example, if the
regenerative feedback 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 with or without a thermostatic switch can be used with the Braking Module
Booksize Compact (List of braking resistors that can be connected (Page 532)). 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).
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.
528
Booksize Power Units
Manual, (GH2), 04/2014, 6SL3097-4AC00-0BP6