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The monitor panel also provides warning of out-of-
spec conditions through audible alarm and displayed
alarm messages. All alarmed conditions are retained
in a non-volatile memory until reset. Alarm thresh-
olds are adjustable, to meet individual site needs.
Alarmed conditions include:
• Output overvoltage
• Output undervoltage
• Output voltage THD
• Output overcurrent
• Neutral overcurrent
• Ground overcurrent
• Transformer overtemperature
• Frequency deviation
• Phase sequence error
• Phase loss
• Five customer-specified alarm conditions
For additional application flexibility, the following
alarms can be configured to shut down the Precision
Power Center-output over/under voltage; phase
sequence error; phase loss; ground overcurrent.
Through a two-conductor communications cable, the
system can communicate alarms and monitored condi-
tions to a Liebert SiteScan central monitoring system.
An isolated RS-232 ASCII communication port is pro-
vided for communication to other monitoring systems.
Basic Temperature Monitoring Panel
The Transformer Overtemperature alarm indicator
is a part of the 180°C transformer temperature sens-
ing circuit. This configuration is optional on all units.
Remote Monitoring Systems
SiteScan
SiteScan is an on-line center for monitoring and con-
trolling all support systems in a large data process-
ing installation. SiteScan provides early warning
alarms and total site management data. A software-
based system using a microcomputer as the central
processing center, SiteScan is programmable, menu-
driven, and upgradeable.
Four primary site management programs are built
into SiteScan:
• Alarm functions provide instant warning of
potential problems. A seven level selection of
options for response to each alarm offers total flexi-
bility in designing a custom-tailored alarm system.
• Control functions allow critical setpoints and
sensitivities to be adjusted by remote control for
dynamic, single-point site management. Password
access preserves site security.
• Status functions provide complete information
on all computer support systems, including real-
time status of all monitored parameters and any
alarm conditions.
• History functions offer database management
capabilities. These functions track, store and
graphically display crucial data and trends for site
management activities such as capacity analysis,
growth predictions, and energy management.
SiteScan makes full use of all features of its com-
puter-based central processor, including RS-232
communications and other output ports and
unlimited expansion via multiplexers. For critical
data processing facilities, the SiteScan system
offers total site management capability in a virtu-
ally obsolescence-proof configuration.
9
System Monitoring
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