Rockwell Automation 8520 9/Series CNC Integration Maintenance Manual Documentation Set - Manual (Page 792)

Section 15B
Replacement Procedures
15B-36
To replace the Hand Pulse Generator and Interface Board
1. Turn OFF all power to the control.
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 and
locked.
2. Disconnect the cable running from the operator panel power supply to
the HPG interface board.
3. Disconnect the fiber optic cables.
4. Remove the screw holding the handle on the HPG interface board
then remove the handle.
5. Disconnect the cable running from the HPG to the HPG interface
board.
6. Remove the 3 nuts on the HPG mounting studs that hold the HPG to
the cabinet or front panel.
Important: The HPG interface board is mounted behind the front panel
using 2 of the 3 nuts that secure the HPG to the front panel. When the nuts
holding the HPG to the front panel are removed, the HPG interface will
come off.
7. If the HPG or HPG interface board is defective, replace it with a new
HPG.
8. Match the setting of the switch assembly on the new HPG interface
board to that of the one being replaced as shown below.
9. Put the HPG back onto the cabinet or front panel.
10. Place the HPG interface board onto two of the mounting studs of the
HPG.
11. Tighten the 3 nuts.
15B.21
Replacing the Hand Pulse
Generator and Interface
Board