Rockwell Automation 8520 9/Series CNC Integration Maintenance Manual Documentation Set - Manual (Page 668)

Section 13A
Connecting 8520 Digital Drive Systems
13A-34
If accessing connectors at the control:
a. Disconnect the absolute encoder signal cable from the servo
connector on the control (J1, J2, or J3).
b. At the cable, use a jumper to short pin 16 to pin 34 (which
connect to pins S and R of the absolute encoder) for at least 2
minutes.
15 1
44 31
30 16
After shorting the pins together for the required time:
1. Make sure the control is OFF.
2. Reconnect the encoder cable to the control.
3. Make sure the battery that supplies battery backup to the absolute
encoders is good and reconnect it.
ATTENTION: Battery power must be supplied to the absolute
encoders prior to turning the control “ON”. Power turn-on
without first connecting the absolute encoder battery may result
in a “Servo AMP Error.” The control remains in E-STOP and
E-STOP reset is ignored. To recover from this condition, follow
the procedure for resetting absolute encoders.
4. Leave the motor connected to the backup battery through the
feedback cable for at least 1 second before turning the control ON.
The axis is then ready to be homed.