SINAMICS S120 Combi
Manual, Edition 07/2012, 6SL3097-4AV00-0BP3
139
DC link components
8
8.1 Braking Module Booksize
8.1.1 Description
The Braking Module is used together with a braking resistor to
● be able to stop the S120 Combi and expansion axes in a controlled fashion when the
power fails (e.g. emergency retraction or EMERGENCY OFF Category 1).
● limit the DC link voltage for brief generator operation, if e.g. the energy recovery function
is deactivated or is not adequately dimensioned.
The Braking Module includes the necessary power electronics and control. When the
Braking Module is in operation, the power which is fed back into the DC link is dissipated via
an external braking resistor.
External braking resistors
On the Braking Module, braking resistors can be operated without thermostatic switches
6SN1113-1AA00-0DA0 (P
N
= 0.3 kW) and 6SL3100-1BE31-0AA0 (P
N
= 1.5 kW).
The cable length between the Braking Module and the braking resistor is limited to a
maximum of 10 m.
A shielded connection cable (3 m, 3 x 1.5 mm
2
) is supplied with braking resistor 6SN1113-
1AA00-0DA0.
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).
CAUTION
The drive system must be completely disconnected from the line supply in order for rapid
discharge to take place. The motors must be at a standstill.
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