Theoryof Operation 15
2.2 Detailed ComponentDescriptions

2.2.1 Controls

Hardware

TheSeries 600T UPS Operator Interface Display System is designedto provide all of the information that is
requiredfor the operation of each UPS cabinet (the System Control Cabinet and each module). The following is
alist of the hardware features:
1. Thecontrol logic performs automatic operations with minimaloperator interface. The limited number of
manualcontrols are easy-to-use.
2. EachSeries 600T UPS cabinet is equipped withan easy-to-read 640 x 200 pixel liquid crystaldisplay (LCD)
screen.It presents information in a way that is easy to understand at an eye-level frontpanel location.
3. Thedisplay is controlled by a dedicated microprocessor with a non-volatile(EPROM) program and a
battery-backed event memor y.
4. TheSeries 600T System Control Cabinet (SCC) has communication ports (terminalboard connections) for:
a. Transmissionof present status information to remote terminals via residentauto-dial communications
programand an external modem. This port also responds to inquiries of the UPS system status and
historyfrom the remote terminal.
b. ReportingUPS system status and history information in response to inquiriesfrom a local terminal (no
modemrequired).
c. Reporting toa local monitor the information requestedfrom the local terminal.
d. Reportinginformation to a Liebert SiteScan central monitoring system.
e. Relayingselected alarm messages to a LiebertRemote Monitor Panel and to a separateterminal board
for customer use.
f. Relaying performance and status informationto your network monitoring system via SNMP interface.

Firmware

TheOperator Interface Display System software enables the operatorto monitor the UPS system status, to con-
trolthe power flow through the UPS, to monitor all of the meter readings,to execute the start-up, shutdown, and
theload transfer procedures, to access the event history files, and to make adjustments to the programmable
parameters.The following is a list of the firmware features:
1. Themenu-driven software prompts the operator for input.
2. Step-by-stepinstructions assist the operator during start-up,shutdown, and load transfer procedures. This
helpsto eliminate operator errors.
3. Graphics-basedmimic diagrams illustrate circuit breakerstatus and the power flow through the UPS system.
4. ThePresent Status screen reports information about the system’s present status. The History Status screen
chroniclesthe events leading up to and immediately after a fault. The Event Historyscreen lists all of the
alarmmessages that have been logged over a period of time.
5. TheBattery Cycle Monitor records information on up to 132 batterydischarge events. Information includes
date,time, length of discharge, highest current demand,lowest battery voltage, and cumulative battery amp
hoursdischarged.
Refer to 3.0 - Operation for a description of thec ontrolsand indicators located on the Operator Control Panel.

2.2.2 Rectifier/Charger

TheUPS module rectifier/charger consists of an input circuitbreaker, optional input isolation transformer,AC
currentlimiting circuit, battery equalizecharge circuit, DC filter,battery charge current limiting circuit,and
bridgerectifiers.

Operation

Therectifier/charger converts the AC input power to DC power.This conversion is accomplished by 3-phase
bridgerectifiers using SCRs. All phases are individuallyfused. Reflected input current THD is less than 7% at
NOTE
Allexternal communication devices are optional equipment.
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