4
Electrical installation
40
Festo – GDCP-CMMD-AS-HW-EN – 1404NH – English
Please note
If the motor is warm and there is an insufficient supply voltage (outside tolerance val-
ues), the holding brake cannot open fully. Result: premature wearing of the brake.
•
Make sure the nominal voltage tolerances are maintained at the terminals of the
holding brake (
Tab. A.10, logic supply).
•
Observe the maximum output current provided by the motor controller (
Tab. A.10).
In the event of a high power requirement, a relay must be connected between the motor controller
and holding brake.
+24 V
GND
+24 V
GND
2
3
4
4
5
BR+
BR-
1
[X6.1/2]
1
Motor controller
2
Power supply unit
3
Motor (brake)
4
RC element for spark arresting
5
Free-wheeling diode
Fig. 4.3
Connection of a holding brake with high power requirement
High voltages with spark formation are created when inductive direct currents are con-
nected via relays.
Recommendation:
Use an integrated RC interference suppressor, e. g.
–
Company: Evox RIFA
–
RC element: 22 Ω in series with 0.47 μF
–
Designation: PMR205AC6470M022
