Battery Maintenance
18
7.0
B
ATTERY
M
AINTENANCE
7.1
Battery Charging, Storage
The batteries are valve-regulated, nonspillable, lead acid and must be kept charged to retain their
design life. The Liebert PSI continuously charges the batteries when connected to the mains supply,
even while the UPS is switched Off.
If the Liebert PSI will be stored for an extended period, Emerson recommends connecting the UPS to
input power for at least 8 hours every four to six months to keep the batteries charged.
7.2
Internal Battery Replacement Procedure
NOTICE
This UPS is equipped with internal batteries that the user can replace without shutting down
the UPS or connected loads (hot swappable). Caution must be exercised when replacing the
batteries because the load is unprotected from power fluctuations and power failures.
To replace the batteries:
1. Remove the two screws on the left side of the front bezel.
2. Pull the front bezel off the UPS.
3. Remove the screw on the battery connector holder.
4. Remove the two screws on the battery bracket.
5. Disconnect the two slotted, red/gray and black battery connectors.
6. Grasp the battery pack assembly by the handle and pull it out of the front of the UPS.
7. Unpack the new battery assembly, taking care not to destroy the packing.
8. Compare the new and old battery assemblies to make sure they are the same. If so, proceed with
replacement. If they are different, STOP and contact your local dealer, local Emerson
representative or Channel Support Applications.
9. Slide the new battery pack into the UPS.
10. Reattach the battery bracket with the two screws.
11. Reconnect the slotted, red/gray and black battery connectors.
12. Reinsert the screw on the battery connector holder.
13. Reattach the front bezel.
Figure 15 Battery replacement
Load Level
Battery Level
Load Level
Battery Level
Step 1
Step 2
Step 3
Step 4
Load L
evel
Batter
y Leve
l
Load Level
Battery Level
Load Level
Battery Level
Step 1
