Maintenance Bypass" Mode - Powerware 9320 Installation And Operation Manual

inverter within 5 milliseconds. 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.
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).

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:
Before transferring the load to Maintenance Bypass using the IA1 switch,
always make sure that each module in the UPS cabinet is in the "Bypass-Mode".
Failure to observe this procedure can cause equipment damage.
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.
Powerware 9320 (10 kVA and 20 kVA) Installation and Operation
164201416 REV. A 071103
LINE 2
BATTERY
LINE 1
BYPASS
(Red)
INV.
LED indication
can be different,
depending upon
the status of the
UPS and LED
condition before
turning IA1 to
the closed
position
7-11