Siemens MICROMASTER 420 - Manual (Page 119)

Issue 07/04 3 Functions
MICROMASTER 420 Operating Instructions
6SE6400-5AA00-0BP0 119
3.13 Motor holding brake (MHB)
Parameter range: P1215
P0346, P1216, P1217, P1080
r0052 bit 12
Warnings -
Faults -
Function chart number: -
For drives which must be secured when powered-down to prevent them
undesirably moving, the MICROMASTER brake sequence control (enabled via
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 drive 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 lie between 35 ms and 500 ms). This delay must be
taken into account in parameter P1216 "Holding brake release delay" (refer to Fig.
3-48).
0 t
fmin
(P1080)
P1217 P1216
OFF1/OFF3
ON
t
ON / OFF1/OFF3:
1
r0052.C
t
f
Point 2 Point 1
t
P0346
Motor excitation
finished
r0056 Bit04
Fig. 3-48 Motor holding brake after ON / OFF1