REXROTH EcoDrive Cs - Page 166

8-44 Motors Rexroth EcoDrive Cs Drives
DOK-ECODR3-DKC**.3-CS*-PR02-EN-P
Battery
Motors with absolute encoders need a battery to back-up the encoder
signals. The battery is set into the drive controller (Exception: Rexroth
Cartesian Motion Systems (CMS)).
The drive controller observes voltage of battery and gives just in time a
warning “F248 Low battery voltage".
The service life of the battery depends on the ratio of switch-ON-duration
to switch-OFF-duration:
OFF
ON
t
t
I =
t
ON
: duration, the drive controller is switched on
t
OFF:
duration, the drive controller is switched off
I: ON/OFF ratio
Fig. 8-53: ON/OFF ratio
Service life of battery (Q = 1800 mAh)
0
2
4
6
8
10
12
14
16
18
20
012345678910
I (ON/OFF ratio)
Service life in years
Standby-
operation
Fig. 8-54: Service life of battery
Thus, the longer the drive controller is switched on, the longer is the
service life of the battery.
Absolute encoders
Warning message
Service life
Courtesy of CMA/Flodyne/Hydradyne ▪ Motion Control ▪ Hydraulic ▪ Pneumatic ▪ Electrical ▪ Mechanical ▪ (800) 426-5480 ▪ www.cmafh.com