Technical data

MKE UL/CSA Commissioning, Operation and Maintenance 15-3
DOK-MOTOR*-MKE*UL/CSA*-PR01-EN-P
Holding brake
The holding brake function must be checked prior to motor installation.
Check procedures are described in following section.
Check holding torque of brake and perform grinding-in sequence if
required.
Procedure:
1. Shut down motor power supply and secure the drive system against
unauthorized operation.
2. When brake is locked check the effective holding torque with a torque
wrench. Refer to brake data sheet for brake data.
3. If the rated holding torque is achieved then the holding brake is ready
for operation.
If the rated holding torque is not achieved then proceed to step 4 for
grinding-in procedures.
4. Initial grinding-in procedure: With brake being locked turn motor
shaft manually for 5 revolutions and check the effective holding
torque again with the torque wrench.
5. If the rated holding torque is achieved then the holding brake is ready
for operation.
If the rated holding torque is not achieved then carry out steps 4. and
5. for one more time.
If the rated holding torque is not achieved after the second grinding-in
then the holding brake is not usable. Contact Rexroth Indramat service.
If the holding brake is used sporadically only (i.e. once in 48 hours or
longer) a rust film could develop on the brake disk surface.
In that case additional maintenance grinding is recommended to avoid a
drop of holding torque below specified values.
Maintenance Grinding
Interval 1x in 48 hours
Motor speed during grinding 100 min
-1
Required grinding revolutions 1
Ambient temperatures -20°C to +50°C
Fig. 15-2: Holding brake, maintenance grinding
Note: Rexroth Indramat drive controllers can be programmed for
automatic execution of maintenance grinding. Refer to drive
controller documentation for details.
Under normal conditions any additional grinding of the brake is not
required. For maintaining the brake operatability under normal conditions
it is sufficient to lock the brake twice (2x) a day by switching off brake
supply voltage.
Prior to initial commissioning
In Operation