Operation
3.1.1.2 Battery Circuit Breaker
The battery circuit breaker on the front panel must be ON before the UPS can
charge the batteries or receive battery back-up power. It opens and closes the
circuit between the battery unit and the UPS. If the ac input circuit breaker is
OFF or tripped and the battery circuit breaker on the front panel is ON, the UPS
will drain the batteries until the batteries reach a predetermined low-voltage
level. When the battery reaches that level, the UPS will shut down and the load
will be dropped.
WARNING
The UPS is connected to charged batteries and contains HIGH
VOLTAGES. When the battery circuit breaker on the front panel
is ON, the receptacles on the back of the unit (see Figure 3–2)
can deliver an electrical shock. This condition can occur even
when the UPS is disconnected from an ac power source and the
ac input circuit breaker is OFF. These high voltages can injure or
kill personnel and damage equipment.
WARNING
When the battery circuit breaker on the front panel is tripped
or turned OFF, but the ac input circuit breaker is ON, the UPS
output receptacles still have HIGH VOLTAGES present. These
high voltages can injure or kill personnel and damage equipment.
CAUTION
To avoid discharging the batteries, DO NOT leave the battery
circuit breaker on the front panel ON when the ac input circuit
breaker is OFF.
NOTE
If the battery circuit breaker on the front panel is turned OFF,
the UPS will go into Bypass mode. If the load is to be shut down
completely, turn OFF the battery circuit breaker on the front
panel AND the ac input circuit breaker.
Operation 3–3
