HP PowerTrust A3589A Manual page 243

To remove and replace the fan assembly:
1. Make sure the BYPASS and the MAIN INPUT breakers are ON.
If the yellow caution light is flashing, do not proceed. Switching the UPS into
CAUTION
Bypass mode when the caution light is flashing may disrupt power to the
load. Call HP Service. If the yellow caution light is not flashing, continue.
2. While depressing the red button on the Service Bypass Unit, set the Service Bypass
switch to .
Bypass
A continuous alarm will sound indicating that the UPS is in Bypass mode.
3. Set the rear panel UPS/BATTERY switch to
4. Use a screwdriver to loosen the screw at the center of each captive thumbscrew on the
Battery Precharge Shorting Plate, then unscrew the thumbscrews and remove the
plate. See Figure 3-8.
5. Disconnect the Battery Box cable from the Electronics Unit.
6. Remove the bezel assembly.
7. Set the MAIN INPUT breaker to OFF.
8. Set the UPS/BATTERY switch to
The green enable LED will turn on until the capacitors are discharged.
9. When the green LED turns off, set the switch to
10.Remove the fan.
a. Remove the four Torx screws that hold the fan assembly to the front of the UPS.
b. Carefully remove the fan assembly from the UPS front panel. While removing it,
unplug the wire connector from the board.
c. Plug the wire connector on the replacement fan to the board.
CAUTION Make sure the fan wire is positioned below the fan housing; otherwise, the
wire can catch in the fan.
d. Carefully position the replacement fan assembly into the UPS front panel and secure
it with the four Torx screws you removed earlier.
11.Turn on the MAIN INPUT circuit breaker.
12.Connect the battery cable to the connector on the Electronics Unit.
13.Check the Battery Precharge Failure LED (see
If the LED is off, continue.
If the LED is on, do not reinstall the Battery Precharge Shorting Plate. Refer to
"Case 14 (Abnormal) — Battery Precharge Failure" in Chapter 6.
Appendix D
. The alarm will turn off.
DISABLE
.
ENABLE
DISABLE
in Figure 1-3).
15
Field Replaceable Units
Removal and Replacement Procedures
.
D-25