3 UPS Operations
Powerware
®
Plus 12 Operator's Manual (164200090 Rev E) 18
When the unit is in Normal mode and automatically transfers to Bypass mode due to an
overload condition, the UPS attempts to return to Normal mode. After output
realĆpower overload failure or any other abnormal condition, return to Normal mode
must be done manually (system startup). The UPS remains in Bypass mode if three
autoĆstart attempts fail within a 10Ćminute period.
Maintenance Bypass
The Maintenance Bypass switch is located under the top cover of the UPS (see
Figure 10 on page 37). When activated, this switch allows for onsite servicing of the
UPS. Be sure that the output breaker is turned on(I).
This equipment is always electrically live. Users must remove utility power
by external means.
Failure to follow instructions results in load power interruption.
When operating in Maintenance Bypass, your equipment is not protected
from power outages.
To transfer the load to Maintenance Bypass:
. Hold the UPS Off button until the Normal indicator goes off and the Bypass
indicator illuminates.
. Wait until the Bypass indicator is the only indicator lit on the front panel.
. Turn the Maintenance Bypass switch from off to on.
. Open (O) the input breaker and battery breaker.
To transfer the load back to the UPS:
. Close(I)theinput breaker and battery breaker.
. Wait until the Bypass indicator is the only indicator lit on the front panel.
. Turn the Maintenance Bypass switch from on to off.
. Press the UPS On button and wait until the Normal indicator illuminates
indicating that the UPS is operating in Normal mode.
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