Maintenance
92
Powerware
®
9170
+
UPS User’s Guide S Rev B www.powerware.com
For more information on preventive maintenance checks, contact your
service representative.
Storage Temperature
Store the Powerware 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 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
You must press the red button beside the switch before turning the
Powerware MBB bypass switch. 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 p anel display.
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