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8-44
Motors
Absolute encoders
Warning message
Service life
20
18
16
14
12
10
8
6
4
2
0
0
1
Standby-
operation
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:
t
:
duration, the drive controller is switched on
ON
t
duration, the drive controller is switched off
OFF:
I:
ON/OFF ratio
Fig. 8-53:
ON/OFF ratio
Service life of battery (Q = 1800 mAh)
2
3
4
I (ON/OFF ratio)
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.
Rexroth EcoDrive Cs Drives
t
I =
ON
t
OFF
5
6
7
8
DOK-ECODR3-DKC**.3-CS*-PR02-EN-P
9
10
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