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DOK-MOTOR*-MSK*EXGIIK3-PR09-EN-P
Synchronous Servomotors MSK For Potentially Explosive Areas
4.3
Holding brake
Control holding brake
Event of fault
In normal operation, use the optional holding brake only when at a standstill
and when performing the drive-internal brake check. In these cases, only low
temperatures (T < 100 °C) exist and no sparks are generated because critical
sliding of the brake linings does not occur.
The voltage supply of the holding brake is to be designed such that the volt‐
age available at the motor for bleeding the holding brake is sufficient even in
the most unfavorable case during installation and operation (see also Rexroth
IndraDrive Drive Systems DOK-INDRV*-SYSTEM*****-PRxx-EN-P, Chapter
"Specification of control voltage")
The voltage supply of the holding brake has to be designed so as to guaran‐
tee that a voltage of 24 V ±10% is available at the motor in order to safely
operate (release and apply) the holding brake.
The voltage arriving at the motor is influenced by cable length and
the properties, e.g. conductor resistance.
If a fault occurs during operation, causing a voltage deviation, this fault must
be detected and eliminated immediately. The failure can be identified, for ex‐
ample, using a monitoring device for undervoltage.
Only in an event of fault, i.e. in the case of a fault in the system, may the
brake be activated when the motor is turning, e.g. in order to prevent a dan‐
gerous lowering of vertical axes. In this case, sparks may be generated in the
brake and increased temperatures may occur within the motor. When a fault
occurs, the operator must eliminate it immediately.
Bosch Rexroth AG
Explosion protection for MSK motors
27/175
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