Maintenance

Storage Temperature

Store the Powerware 9170 battery modules (in the unit or battery cabinet) at ￿20 to +40°C (￿4 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 ￿40 to +60°C (￿40 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 hot￿swappable 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 7￿ (17 cm) to the secondary stop on top of the module.

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Powerware® 9170 User's Guide ￿ LTM-1344 B Uncontrolled Copy