Technical data

16-12 Notes Application MHD Sychronous motors
DOK-MOTOR*-MHD********-PR05-EN-P
Before start-up and during operation specifications the brake function
must be tested with the “brake command” function. By applying a small
amount of motor torque, the brake is tested for slippage. Additional
information and specifications of this function may be found in the
ECODRIVE firmware functional descriptions.
Selecting Holding Brakes
Brakes are either electrically clamping or electrically releasing. Due to
functional differences, different brakes should be used for main spindle
and servo-axles. Observe the safety requirements during the plant
design.
t
U
n
[V]
0
24
t
1
t
2
AH_brake_diagr.fh10
t
1:
Connection time
t
2:
Disconnection time
Fig. 16-18: Holding brake diagram
Servo Applications
The electrically releasing holding brake is used to hold the axis at a
standstill and when the “controller enable” signal is off. When the supply
voltage fails, the electrically releasing brake will automatically close.
⇒ Do not use the holding brake as an operational brake for moving
axles.
⇒ For hanging axles, switch off the “controller enable” signal only after
the mechanism has stopped and is clamped by the holding brake.
If the brake is engaged repeatedly on a drive in motion or the rated brake
torque is exceeded, premature brake wear can occur.
The electrically clamping holding brake is inappropriate for servo
applications because clamping in a de-energized clamping state is not
possible.
Functional test
Electrically releasing holding
brake