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Powerware 9335 (80 kVA and120 kVA) Installation and Operation 7-11
164201396 REV. A 071103
inverter within 5 milliseconds. When utility power returns, the UPS will startup in
NORMAL (inverter) mode. Operator intervention is required to reset to ECO mode.
The battery
charger remains active in the “Bypass-Mode”. The “Bypass-Mode” is
recommended only if the loads can tolerate power interruptions of up to 5 ms, the
transfer time from Bypass Mode to ON-LINE Mode.
7.4.3 “MAINTENANCE BYPASS” Mode
The Maintenance Bypass Mode is performed by means of the IA1 BYPASS SWITCH on
the front of the UPS. When the switch is in the “O” (OFF) position, the Bypass Switch is
OPEN. This is the normal operating condition, where the load is supplied by the
inverter, or via the static bypass. When the switch is in the “I” (ON) position, the Bypass
Switch is CLOSED, causing load power to be supplied directly from the utility source.
LED’s green
when shown
shaded,
unless noted
CAUTION:
In order to provide the load with maximum protection, it is always
recommended that the load be supplied by the inverter (ON-LINE Mode).
CAUTION:
Before transferring the load to Maintenance Bypass using the IA1 switch,
always make sure that the UPS cabinet is in the “Bypass-Mode”. Failure to
observe this
p
rocedure can cause e
q
ui
p
ment dama
g
e.
CAUTION:
When the UPS is operated in the Maintenance Bypass mode through the Bypass
Switch IA1, the load will not be protected in the event of a utility supply failure.
It is therefore strongly recommended that the user switch back to ON-LINE
(INVERTER ON) or BYPASS (OFF-LINE MODE) as soon as possible.
LINE 2 BYPASS
BATTERY
(Red)
LINE 1 INV.