Rockwell Automation 8520 9/Series CNC Integration Maintenance Manual Documentation Set - Manual (Page 802)

Section 15B
Replacement Procedures
15B-46
Important: The use of a ground strap is recommended to prevent static
discharge to any of the sensitive electronic components on the servo
amplifier logic board(s).
2. Disconnect all cables that are connected to the servo module.
Important: For digital systems, the control must be “homed” after
replacing the servo module. If the servo motors incorporate an absolute
encoder, the absolute axis position will be lost. The absolute encoder must
be reset after the servo module is replaced. Refer to page 13A-33 for
absolute encoder reset procedures.
3. Remove the 4 mounting screws that hold the board rack with the
servo module to be replaced, in the component enclosure. Slide the
board rack out of the component enclosure board slot.
4. Remove the 6 mounting screws, shown in Figure 15B.10, which hold
the servo module to the board rack.
5. Remove the servo module being replaced and install the new servo
module.
6. Replace and tighten the 6 mounting screws.
7. Slide the board rack into the the board slot of the component
enclosure then replace and tighten the 4 mounting screws.
8. Replace all cables that were disconnected.
9. Turn ON power to the control.
To replace an analog servo amplifier, first read all documentation prepared
by the analog servo amplifier’s manufacturer, then:
1. Turn OFF all power to the control and the servo amplifier.
ATTENTION: To guard against electrical shock hazards, never
make connections or disconnections at the ac distribution
network unless the main ac disconnect switch is open (off) and
locked.
2. Carefully disconnect and mark all cables that are connected to the
servo amplifier.
15B.30
Replacing an Analog Servo
Amplifier