- Eaton UPS User's Guide

MAINTENANCE

Eaton 9170

UPS (3–18 kVA) User's Guide S 164201393 Rev E www.eaton.com/powerquality

Storage Temperature

Store the Eaton 9170+ battery modules (in the UPS or external 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 Eaton 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

Press the red button beside the switch before turning the Eaton MBB

bypass switch. This button:

S Sends an electrical signal to the UPS to switch to the internal Bypass

mode (if it is not already operating in that mode).

S 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.

Return the UPS to Auto mode by selecting that mode on the front panel display.

See “Bypass Switch Operation” on page 23 for additional information.

Battery Replacement

The Eaton 9170+ hot‐swappable feature lets you replace the battery

modules without disconnecting the load or damaging the batteries.

NOTE The Eaton 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. The UPS may indicate an alarm with no batteries

present.

To replace battery modules in pairs:

1. Remove the front covers from the battery modules to replace.

The covers have spring latches on the left and right sides that hold

them in place.

2. Grasp the battery module handle and press down on the latch

release.