16-4 Startup, Operation, and Maintenance Synchronous Motors MKD
19.05.2004 Version7.0 DOK-MOTOR*-MKD*******-PR07-EN-P
Changing the battery
Drive control systems of Rexroth observe voltage of battery safely and
give just in time a warning “change battery”.
Changing the battery should be made, when machine is under load. This
is necessary to avoid an overrun in the motor encoder (switch off control
voltage can cause loss of absolute values).
Following tools and spare parts are needed:
• Screw driver Torx according to Fig. 16-2
• Needle-nosed pliers
• Torque spanner with setting range 1.3-6.8 Nm.
• New, assembled battery for
MKD025. -041, -071. Ord. No. R911277133
MKD090, -112 Ord. No. R911281394
housing-screw thread Screw driver size Starting torque
MKD025, -041 M3 Torx T 10 1.4 Nm
MKD071, -090, -112: M4 Torx T 20 3.0 Nm
Fig. 16-2: Overview housing-screws
DANGER
Danger to life by electric voltage!
To change the battery you must work when machine is
under load. Therefore:
⇒ Any work required on the electric system may only
be carried out by skilled electricians.
⇒ Switch off power supply at the drive control systems
and save against re-start!
DANGER
Hazardous movements!
Danger to life, mayhem or material damage!
⇒ Switch off power supply at the drive control systems
and save against re-start!
⇒ Change battery on drive control systems only when
control voltage is inserted. Is the control voltage
switched off when the battery is removed, the
absolute value is lost and when the machine will be
switched on, a failing movement could be possible.
1. Loosen housing screws (1) with a torx-screw driver (appropriate size
see Fig. 16-2).
2. Dismount housing lid.
3. Take off the connector of the battery (2).
4. Lossen screws (3) of the battery`s screw terminal and remove the
battery.
Change battery when machine is
under load
Change battery
Remove the battery
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