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1.
At this point, the AC power cord should still be unplugged.
2.
Pull down the circuit breaker handle on the AC input box (see Figure
5-1).
3.
At the control panel, make sure the pushbutton switch is in the off po-
sition.
The circuit breaker on the power supply controls power to the system. For
normal operation, the circuit breaker handle must be in the on or up posi-
tion. To shut the circuit breaker off, push the handle down.
For safety, current overload and over-temperature cause the circuit
breaker to trip to the off position, removing all power from the system.
WARNING:
The circuit breaker on the power supply controls power
to the system. In a battery backed-up system, if you unplug
the system and leave the pushbutton switch in the on posi-
tion, power is still present. Be sure circuit breakers on the
power supplies are in the off position when working on the
system. In systems with redundant power, the circuit
breaker on the power strip controls AC input but does not
control DC output in a battery backed-up system.
Powering Up the System 5-3
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