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10.2.2
UPS Circuit Breakers
The UPS can contain as many as four circuit breakers, the UPM Input Breaker
(CB1), the UPS Output Breaker (CB3), the System Bypass Breaker (CB4), and the
Backfeed Protection Breaker (FBP).
CB1 controls the input to the UPS rectifier, while CB3 controls the output of the
UPS inverter. CB1 is optional and may be either motor operated or manual
controlled.
CB4 and the FBP are used in single module applications and are contained in the
Module Bypass section of the UPS. CB4 is used as the bypass supply in the event
the output of the UPS is not available and to supply the critical load during
maintenance. The FBP is used to prevent power feedback to the UPS input supply
when the UPS is operating in the battery mode. These breakers are electrically
controlled by the UPS and are automatic in operation.
Multi-module systems replace the Module Bypass section of the UPS with a
System Bypass Module (SBM). Refer to the applicable SBM Installation and
Operation manual referenced in the Introduction of this manual for SBM circuit
Breakers.
In addition, a remote mounted external battery disconnect is used to connect the
battery string to the UPS. This disconnect is manually operated.
10.2.3
EMERGENCY UPM OFF
An EMERGENCY UPM OFF pushbutton is provided for situations where you must
instantaneously control the UPS output. The pushbutton is located on the front of
the UPS for quick access and is covered with a clear plastic shield to prevent
inadvertent operation. The shield must be raised before pressing the pushbutton.
The EMERGENCY UPM OFF pushbutton is described in detail in Chapter 12,
"UPS Operating Instructions."
10.2.4
Customer Interface
Computer Interface
Two serial communications ports are standard on all units, and are electrically isolated
from the UPS. You can use these ports to link the UPS to the features described in
Chapter 15, "Serial Communications" and Chapter 16, "Remote Notification."
Building Alarm Monitoring
You can connect your facility's alarm system contacts to four 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 13, "Using Features and Options."
Summary Alarm Contacts
Alarm contacts are provided for connection to equipment at your facility, such as a
light, an audible alarm, or a computer terminal. The equipment you connect to these
contacts alerts you to an UPS alarm. This feature is described further in Chapter 13,
"Using Features and Options."
10.2.5
Automatic Battery Charge Current Limit
A preset limit restricts battery charging current to protect batteries from damage
due to high current charging. Charging at high currents can overheat and damage
batteries.
Powerware 9315 (500 kVA- -750 kVA) Installation and Operation
164201244 REV. D 030101
10--3
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