Siemens SINAMICS S120 Function Manual page 441

Acknowledgment of faults
When the Braking Module issues a fault message at binector input p3866, an attempt is made
to acknowledge the fault using signal r3861 at terminal X21.1 Booksize or X21.3 Chassis every
10 ms. Alarm A06900 is output simultaneously.
Fast DC link discharge (Booksize)
It is only possible to quickly discharge the DC link via the Braking Module External for the
Booksize format. It is activated via binector input p3863 and started after the line contactor
opens and the adjustable delay time (p3862) has expired. The fast discharge is completed
when the line contactor contact closes.
Note
A fast DC link discharge requires the use of a line contactor with feedback signal (p0860) that
is controlled via r0863.1.
Overview of important parameters (see SINAMICS S120/S150 List Manual)
● r0108.26
● p3860
● r3861.0...7
● p3862
● p3863
● p3864.0...7
● p3865[0...7]
● p3866[0...7]
Drive functions
Function Manual, 06/2019, 6SL3097-5AB00-0BP2
Drive object function module;
Braking Module External
Braking Module number of modules connected in parallel
BO: Braking Module inhibit/acknowledgment
Braking module, DC link fast discharge delay time
BI: Braking Module, activate DC link fast discharge
BO: Braking Module DC link fast discharge
BI: Braking Module prealarm I2t shutdown
BI: Braking Module fault
Function modules
9.4 Braking Module external
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