Holding Brake - REXROTH EcoDrive Cs Project Planning Manual

Rexroth EcoDrive Cs Drives

Holding Brake

DOK-ECODR3-DKC**.3-CS*-PR02-EN-P
Optional. Required for holding the servo axis when the machine is in the
de-energized state.
Hazardous movements! Persons endangered by
falling or descending axes!
⇒ The serially delivered motor holding brake does not
suffice to ensure overall personal protection!
DANGER
Ensure personal protection by superordinate failsafe
⇒
measures:
Block off the hazardous range by means of a safety
⇒
fence or a safety screen.
⇒ Additionally secure vertical axes to prevent them from
falling or descending after having switched off the
motor, for instance as follows:
– lock the vertical axis mechanically,
– provide an external braking / collecting / clamping
device, or
– ensure proper weight compensation of the axis.
Operating Principle
The holding brake is operated according to the "electrically releasing"
principle. In the de-energized state, a magnetic force acts upon the brake
armature disk. This causes the brake to close and to hold the axis.
By applying 24 V , the permanent magnetic field is compensated by the
DC
electrically generated magnetic field: the brake opens.
U n [V]
t : Connection time (100 W: 25 ms; 200/400 W: 50 ms; 750 W: 60 ms)
1
t : Disconnection time (100 W: 25 ms; 200/400 W: 50 ms; 750 W: 60 ms)
2
Fig. 8-40: Holding brake diagram
The holding brake is activated by the drive controller. This ensures the
proper on and off order in all of the operating states.
Note: A premature wear and tear of the holding brake is possible!
The holding brake wears after approx. 3000 motor revolutions
in closed state. For that reason, do not use the holding brake
as a system brake to stop a moving axis! This is permitted for
EMERGENCY STOP situations only.
t t
1 2
24
0
t
brake_diagr.fh7
8-29
Motors