Exide powerware plus - Page 21

3 UPS Operations
Powerware
®
Plus 12 Operator's Manual (164200090 Rev E)  16
Normal Mode
In Normal mode, incoming AC commercial power is filtered to reduce spikes and noise.
A portion of the utility power is automatically redirected to charge the battery, and the
battery charge condition is monitored. If the utility AC fails or falls out of specified limits,
the UPS automatically goes to OnĆBattery mode. The UPS automatically returns to
Normal mode when the utility power returns to within specified limits.
If Automatic Bypass is enabled and the utility goes out of specified limits, the Normal
indicator flashes and Bypass is not available.
On-Battery Mode
In OnĆBattery mode, the battery system provides DC power that is converted to
conditioned AC by the UPS. Depending upon the battery capacity, the system operates
in the OnĆBattery mode until the battery is fully drained. Output power is then no longer
available to the load. If incoming power returns within specified parameters, the UPS
automatically returns to Normal mode.
When the utility fails and the unit transfers to OnĆBattery mode, the Normal indicator
goes off, the Battery indicator illuminates, and the alarm sounds. Press the Horn
Silence button to turn off the alarm. The Battery indicator flashes and the alarm sounds
again when the battery is almost discharged. When the battery reserves are depleted,
the Battery indicator goes off and the UPS no longer provides power.
Overload Mode
The Overload indicator illuminates when the system goes into an overload condition
due to one of the following conditions: overload current is between 106% to 124% of
rating for 10 minutes, 125% to 149% for 30 seconds, or greater than 150% of the output
current rating for 10 cycles. The alarm sounds. Push the Horn Silence button to turn off
the alarm. If the Bypass feature is disabled or not available, the unit shuts down. If
Bypass is enabled, the unit transfers to Bypass mode in an overload condition.
Bypass Mode
In the Bypass mode, the UPS transfers the critical load directly to the filtered utility
power, provided the bypass source is available. The transfer occurs due to one of the
following conditions:
 Load current is between 106% to 124% of the rating for 10 minutes, 125% to 149%
for 30 seconds, or greater than 150% for 10 cycles. (The UPS attempts three
restarts.)
 UPS internal temperature exceeds safe operating range. (The UPS does not
attempt a restart.)
 UPS output falls out of the specified voltage limits. (The UPS does not attempt a
restart.)
 Output real power exceeds specified limits. (The UPS does not attempt a restart.)
 Load current inrush (surge) exceeds peak current capability. (The UPS
continuously tries to restart.)
When the unit is in Normal mode and automatically transfers to Bypass due to a load
current overload condition, the UPS attempts to return to Normal mode. If three
autoĆstart attempts fail (due to a load current) within a 10Ćminute period, the UPS
remains on Bypass. When the unit transfers to Bypass due to an overtemp, realĆpower
overload, or inverter failure, the UPS remains on Bypass and does not attempt a restart.
When a surge current causes the unit to transfer to Bypass, the UPS continuously tries
to restart.