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Field Replacement Units
To replace a faulty unit, order from the field replacement units (FRUs) listed in Field replacement units for WEB-645-AX.. An FRU
consists of only the WEB-645-AX circuit board, without connector plugs.
FRU parts can be ordered from stock, but the replaced circuit board (removed from the WEB-645-AX) must be returned to your
vendor for credit.
NOTE: Before ordering an FRU, it is strongly recommended that you contact your normal technical support resource to
eliminate the possibility of a software issue or mis-configuration problem.
NOTE: Be sure to contact your vendor for a return authorization (RA) number (see "Returning a Defective Unit," page
16) before shipping an item for return credit or repair. To allow proper licensing of the replacement unit, please
have information ready about the existing unit, including its serial number, model number, and license informa-
tion, when placing the order.
Part Number
WEB-RB-645-AX
Circuit board, WEB-645-AX or WEB-645I-AX, WEBs AX (configurable also for WEBs R2).
Replacing the WEB-645-AX circuit board
CAUTION
Be aware of small surface-mounted components on the circuit board near each mounting point!
— Use a 1/4" (6mm) thin-walled socket, not a nut driver, to carefully loosen or tighten the nuts that secure the controller's circuit
board to the 7 mounting studs. A nut driver can cause board damage to adjacent components, while a socket (if used
carefully) typically does not.
— Retain and reuse metal spacers on all mounting studs (between the board's back and enclosure).
— Before handling circuit boards, discharge any accumulated static by touching the metal surface of the controller. For details,
see "Static Discharge Precautions," page 3.
To replace the controller's circuit board with an FRU circuit board in the field, proceed as follows:
NOTE: The software that runs on the controller expects the terminal positions to be the same to collect data from or to
control the attached devices.
Replacing an FRU circuit board.
1. Using the appropriate WEBs software tool, back up the station database to your PC.
2. Open the cover of the unit.
3. Turn off building power to the unit. The unit should power down automatically.
4. Unplug the 6-position power connector from the board.
5. Note positions of all communications connectors going to the circuit board.
If necessary, label connectors to avoid mis-connection later (after circuit board is replaced).
6. Unplug all Ethernet, LON, and serial connectors from the circuit board.
7. Using a 1/4" socket (see previous Replacing the WEB-645-AX circuit board), carefully remove and retain the seven 1/4"
nuts securing the circuit board. Be mindful of small surface-mount components located near board mounting points.
8. Remove the circuit board.
Make sure that metal spacers (behind the board) remain on the seven mounting studs.
9. Replace the FRU circuit board on the mounting studs and spacers, carefully securing with the seven 1/4" nuts. Again, be
mindful of small surface-mount components located near board mounting points.
10. Reconnect any Ethernet, LON, and serial connectors.
11. Turn on building power to the unit.
12. Plug the 6-position power connector in and verify normal operation.
13. Using WEBs-AX Workbench to make a platform connection, re-commission the WEB-645-AX, including the following:
a. Install the correct WEBs release and set the date and time.
b. Install the new license file.
c. Restore the station database and start the station.
Table 6. Field replacement units for WEB-645-AX.
WEB-645, CP-645 NETWORK CONTROLLER
Description
15
62-0432—01
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