Rockwell Automation 8520 9/Series CNC Integration Maintenance Manual Documentation Set - Manual (Page 667)

Section 13A
Connecting 8520 Digital Drive Systems
13A-33
The turns counter register of an absolute encoder can be reset to zero at
system start up or if the absolute encoder’s battery backup has failed.
Resetting an Absolute Encoder on the 9/230
At the control:
1. Move the axis that the absolute encoder is configured for in AMP to
the desired zero coordinate position for that axis.
2. Turn OFF the control and the main ac power switch.
ATTENTION: Never adjust the control unless the main AC
disconnect switch is open (off) and locked.
3. Disconnect the battery that supplies battery backup to the absolute
encoder being reset.
4. Determine whether it is easier to disconnect and access connectors at
the servomotor or at the control.
If accessing connectors at the 8500 digital servo motor:
a. Remove the cable that is connected to the absolute encoder to be
reset.
b. At the encoder, use a jumper to short pin R to pin S of the
absolute encoder for at least 2 minutes.
A
B
C
D
E
F G
H
J
L
M
N
P
R S
T
K
13A.9.3
Resetting Absolute
Encoders on an 8500 Digital
Servo Motor