HP PowerTrust A3589A, Manual

Page: 223 / 257

Appendix D D-5
Field Replaceable Units
Removal and Replacement Procedures
5. Disconnect the Battery Box cable from the Electronics Unit.
6. Remove the bezel assembly and the four Torx screws that secure the Electronics Unit to
the rack.
7. Slide the old Electronics Unit out of the rack. This will disconnect it from the Service
Bypass Unit.
WARNING The Electronics Unit weighs about 68 kg (150 lbs). Two people are
required to remove and replace it.
8. Check that the Output On/Output Off switch on the replacement unit is set to
Output Off
.
9. Check that the UPS/BATTERY switch on the replacement unit is set to
DISABLE
.
10.With the help of another person, slide the replacement Electronics Unit back into the
rack.
11.Carefully push the Electronics Unit until it connects completely with the Service
Bypass Unit.
12.Reattach the four Torx screws that secure the Electronics Unit to the rack.
13.At the back of the replacement Electronics Unit, unscrew the thumbscrews on either
side of the Battery Precharge Shorting Plate and remove it. You may have to use a
screwdriver to loosen the screw at the center of each captive thumbscrew.
14.Connect the battery cable to the connector on the Electronics Unit.
15.Check the Battery Precharge Failure LED (see
15
in Figure 1-3).
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.
16.Orient the plate so that the notch is positioned over the Battery Box cable connector,
then reattach the plate making sure that the prongs on the plate are pressed firmly into
the clips in the Electronics Unit. See Figure 3-9.
You may need to rock the plate back and forth as you push it in.
CAUTION Operating the UPS without the Battery Precharge Shorting Plate is not
supported and may result in loss of UPS AC output.
17.Tighten the thumbscrews on either side of the Battery Precharge Shorting Plate.
18.Switch the UPS/BATTERY switch to
ENABLE
. Wait for the green Enable LED to come on.
The UPS will beep continuously. You can silence the beeping by pressing the Silence
Alarm/Test switch on the control panel.
19.Switch the Output On/Output Off switch to
Output On
.
The Caution LED should flash for about five seconds then go out.
20.When the Caution LED stops flashing, go to step 21.