Siemens MICROMASTER 440 Operating Instructions Manual page 134

3 Functions
The motor holding brake is either closed using OFF1 / OFF3 or OFF2. For OFF1 /
OFF3, when the minimum frequency P1080 is reached, the motor is operated at
this frequency until the brake has been applied (closing times of brakes lie between
15 ms and 300 ms). The actual time is specified using parameter P1217 "Holding
time after ramp down" (refer to Fig. 3-49). If, on the other hand, an OFF2 command
has been output, then independent of the drive state, the status signal r0052 bit 12
"Motor holding brake active" is reset. This means that the brake immediately closes
after OFF2 (refer to Fig. 3-50).
ON / OFF2:
OFF1/OFF3
Motor excitation
r0056 Bit04
Fig. 3-50
The mechanical brake is controlled using the status signal r0052 bit 12 "Motor
holding brake active" of the brake control. This signal can be output as follows:
Via digital outputs
The status signal is output via the digital output. In this case, the internal
MICROMASTER relay (if the specification is sufficient) or also an external
contactor or relay can be used to control the brake.
Via status signal using the serial interface (USS or PROFIBUS)
The master must process the status signal. The signal must be connected to
the digital output of the master to which the contactor / relay for the motor
holding brake is connected.
134
OFF2
Inactive
Active
ON
finished
P0346
f
fmin
(P1080)
P1216
r0052.C
1
0
Motor holding brake after OFF2
MICROMASTER 440 Operating Instructions
6SE6400-5AW00-0BP0
Issue 10/03
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