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8.2.3
SMB Circuit Breakers
The System Maintenance Bypass (SMB) contains two breakers: the Maintenance
Bypass Breaker (MBP) and the Maintenance Isolation Breaker (MIS). The MIS
connects the output of the UPMs to the critical load via CBS. The MBP is used as
the bypass in the event the output of the SSBM is not available and to supply the
critical load during SSBM maintenance. These breakers are manually controlled
through electrical interlocks which include a control switch mounted inside the
Control Section on the A1 Panel.
8.2.4
Fully Rated Static Switch
The fully rated static switch is connected in series with the FBP and is only gated
on during emergency transfers from Normal to Bypass mode. The fully rated static
switch is electrically controlled by the SSBM and is automatic in operation.
8.2.5
EMERGENCY UPM OFF
An EMERGENCY UPM OFF pushbutton is provided for situations where you must
instantaneously control the UPM and SSBM output. The pushbutton is located on
the front of the SSBM 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 10, "Operating Instructions for the Parallel Capacity/Redundant System."
8.2.6
Customer Interface Panel
PowerNet
Two redundant control networks connect UPM to UPM and UPM to the SSBM. Each
network requires only one shielded twisted pair of wires. Refer to Appendix A, drawing
164201335 ---4 for further information.
Computer Interface
Two serial communications ports are standard on all units, and are electrically isolated
from the SSBM. You can use these ports to link the SSBM to the features described in
Chapter 13, "Serial Communications" and Chapter 14, "Remote Notification."
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 SSBM alarm. This feature is described further in Chapter 11,
"Using Features and Options."
Building Alarm Monitoring
You can connect your facility's alarm system contacts to six inputs in the SSBM. The
SSBM uses these inputs to monitor your building alarms in addition to the SSBM
status. This feature is described further in Chapter 11, "Using Features and Options."
8.2.7
Customer Convenience Outlet
An uninterruptible 120VAC, 0.2 amp, fuse-protected convenience outlet is provided
to supply power to the optional modem. It is located adjacent to the Customer
Interface Panel.
8.2.8
Installation Features
Power wiring can be routed through the top or bottom of each cabinet. External
sensing and monitoring control wire must be installed in accordance with Class 1
wiring methods. Class 1 wiring can be routed through the top or bottom of each
cabinet.
8--6
Powerware 9315 Parallel Capacity/Redundant System with PHP SSBM
164201373 Rev. A
092402
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