Operator`s manual

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Powerware Plus 18 Operator'sManual(LTM-1336B)8
AC
INPUT
TO UPS
SURGE
SUPRESSION
EMI/RFI
FILTERS
FRONT
PANEL
BATTERY
RECTIFIER
INVERTER
BYPASS LINE
BATTERY CABINETS
AC OUTPUT
TO LOAD
TERMINAL BOARD
FOR REPO
REMOTE BATTERY
CONNECTION
BYPASS
PLUS
BATTERY
BATTERY
EMERGENCY
POWER
OFF
ST SHUNT TRIP
F FREQUENCY METER
A AM METER
V VOLT METER
VA VOLTĆAMP METER
W WATT METER
T TEMPERATURE
LEGEND
Figure 2. UPS Block Diagram
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. During
this mode, 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.
The Normal indicator lights during normal system operation. 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.