Powerware 9170+ - Manual (Page 78)

Maintenance
74 Powerware ® 9170 User's Guide S LTM-1344 B Uncontrolled Copy
Storage Temperature
Store the Powerware 9170 battery modules (in the unit or battery
cabinet) at ć20 to +40°C (ć4 to +104°F). Batteries will have a longer
shelf life if they are kept below +25°C (+77°F). The Powerware 9170
UPS or battery cabinet without batteries may be stored at ć40 to +60°C
(ć40 to +140°F).
External Bypass Switch (Make-Before-Break Only) Operation
Before turning the Powerware MBB bypass switch, you must press the
red button located next to the handle. This button serves two purposes.
It sends an electrical signal to the UPS to switch to the internal Bypass
mode (if it is not already operating in that mode). The button also
operates a mechanical interlock, to prevent the switch from being
turned without first signaling the UPS.
NOTE When the red button is released, the UPS remains in its internal Bypass mode
and must be manually returned to the Auto mode by selecting that mode on the front
panel display.
Battery Replacement
The Powerware 9170 hotĆswappable feature allows you to replace the
battery modules easily without disconnecting the load or damaging the
batteries.
NOTE The Powerware 9170 UPS will operate with uncharged (or no) batteries, but
will have limited (or no) battery backup capability. Backup protection requires at least
three battery strings for every four power modules.
Use the following procedure to replace battery modules in pairs.
1. Remove the front panel bezel(s) covering the battery modules
you need to replace. Label the original module with masking
tape or some other identifier.
2. Grasp the battery module handle and press down on the latch
release.
3. Pull the module out approximately 7I (17 cm) to the secondary
stop on top of the module.