Ups Circuit Breakers; Smart Load Off; Maintenance Bypass Switch; Cold Start Switch - Powerware 9330 Installation & Operation Manual

8.2.2

UPS Circuit Breakers

The UPS can contain as many as 10 circuit breakers, depending on the system
options. The UPS circuit breakers are described in detail in Chapter 10, "UPS
Operating Instructions."
UPS Cabinet
CB1 controls the input to the UPS rectifier, while CB2 controls the battery input to the
UPS inverter. CB1 and CB2 are manually controlled.
Optional Battery Cabinet
A local battery circuit breaker controls the output of each battery cabinet, providing
the ability to service each battery string individually.
Options Cabinet
Bypass and output circuit breakers control the flow of current to the UPS and Power
Distribution Module.
8.2.3

Smart LOAD OFF

A smart LOAD OFF pushbutton is provided for situations where you must quickly
control the UPS output. The pushbutton is located on the front of the UPS for
quick access, but provides a safety feature to prevent inadvertent load dumps. The
LOAD OFF pushbutton is described in detail in Chapter 10, "UPS Operating
Instructions."
8.2.4

Maintenance Bypass Switch

An internal Maintenance Bypass switch is provided to completely isolate the main
power processing unit of the UPS during service. The Maintenance Bypass
Switch is described in detail in Chapter 10, "UPS Operating Instructions."
8.2.5

Cold Start Switch

A Cold Start switch is provided to start the UPS in Battery Mode when no
commercial power is available. The Cold Start Switch is described in detail in
Chapter 9, "UPS Operating Instructions."

UPS Standard Features

8.3
The UPS has many standard features that provide cost-effective and consistently
reliable power protection:
8.3.1

Customer Interface

Computer Interface
One communications port is standard on all units, and is electrically isolated from the
UPS. You can use this port to link the UPS to the features described in Chapter 13,
"Communications".
Building Alarm Monitoring
You can connect your facility's alarm system contacts to four (4) inputs in the UPS.
The UPS uses these inputs to monitor your building alarms in addition to the UPS
status. This feature is described further in Chapter 11, "Using Features and Options."
Powerware 9330 (IBM 9910 20 kVA) Installation and Operation
164201491 REV. B 013004
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