SECTION IV
Maintenance
Page 4.10
BP+2.9X
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4.6 Battery Maintenance (continued)
4.6.5
Battery Replacement
1. Perform Maintenance Shutdown procedure (Paragraph 4.6.2).
2. Disconnect the desired battery tray, unbolt it from its slide and slide it out
onto a lift hand truck.
CAUTION
The battery tray weighs as much as
200 lbs (91 kg). Use lift hand truck to remove it.
3. Disconnect battery and remove it from the tray. Note battery polarity.
4. Mount new battery in tray, clean the posts and cable lugs and connect
cables, observing polarity (see Figure 4-1 or 4-2 on next page).
5. Torque cable connector bolts to battery manufacturer's specifications.
6. Using a digital voltmeter which can be read to 0.01 vdc, check voltage
across the poles of the new battery. Voltage should be at least 12.40 vdc.
7. Apply a generous amount of grease (Dow Corning silicone grease or equal)
to the battery posts and connectors.
8. Push battery tray back to its original position. When the tray is fully back,
replace the two bolts that fasten it to the slide.
9. Reconnect the battery tray cables.
4.6.6 Reactivating the Battery Pack
1. After all battery trays and their batteries are in place and reconnected,
close the battery pack doors.
2. Verify UPS rectifier DC link voltage is at proper value (234VDC for 10-
3OkVA; 39OVDC for 37.5-300kVA).
3. Close the DC Disconnect switch
only if link voltage is correct.
