Functions
8.15 Brake functions
Control Units CU240S
8-78 Operating Instructions, 11/2006, A5E00766042B AA
8.15.1.2 Motor Holding Brake
Data
P1215
P0346, P1216, P1217, P1080
Parameter range:
r0052 bit 12
Warnings: -
Faults: -
Function chart number: -
Description
For motors which must be secured when powered-down to prevent undesirable movement,
the SINAMICS G120 brake sequence control (enabled through P1215) can be used to
control the motor holding brake.
Before opening the brake, the pulse inhibit must be removed and a current impressed which
keeps the motor in that particular position. In this case, the impressed current is defined by
the min. frequency P1080. A typical value in this case is the rated motor slip r0330. In order
to protect the motor holding brake from continuous damage, the motor may only continue to
move after the brake has been released (brake release times are between 35 ms and
500 ms). This delay must be taken into account in parameter P1216 "Holding brake release
delay" (see figure below).
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