Liebert 7400 Series User Manual

7400 Series UPS User Manual Chapter 4 - Optional equipment
Single Module and One plus One Systems RS 232 Communications Management Board (SGC) (4550002C)
6310018a.02.doc
4-15
Issue 2
(02/98) LCA 10/01
4.6 RS 232 Communications Management Board (SGC) (4550002C)
The optional RS232 Communications Management Board takes existing
information available from the display
assembly, stores it and converts it into a customer usable form for display
either locally or remote to the UPS. It can be interrogated via a telephone-
modem system from a remote service centre and it can activate a remote
station in the event of an alarm to down-load the current status.
Figure 4-7 shows a typical system using the RS232 Communications
Management Board, which is referred to as the SGC (Scheda Gestione
Communicazione). One would be fitted to the MSSC for system
information and one to each UPS module for individual module
information. The SGC has two outputs; the first, as shown, is the modem
connection and the second connects directly into a PC for local
monitoring where required.
Remote communications can be via a dedicated telephone line or a non
dedicated line, in the second case a "Data Switch" will be required to
select the modem connected to the UPS when required.
The information stored on this board is maintained in the event of a UPS
shutdown by (alkaline) batteries. These batteries also maintain an on-
board clock which times and dates events as they occur.
The SGC board continually stores information on the dynamic power
parameters within the UPS. Four hundred of these events are stored in a
recirculating memory, the most recent displacing the earliest in the
‘Power History’store. A similar ‘Event History’store tracks the changing
operational status of the machine. This memory reflects the alpha-
numeric display on the front panel and updates whenever a change takes
place. The message would normally read ‘NORMAL OPERATION’ but
would change when a ‘WARNING’ or ‘ALARM’ condition occurred. If
an ‘ALARM’ occurs the SGC board marks the event in the ‘Power
History’and after a further 199 events, the system locks out any further
updates. This gives a snap-shot of the events on either side of the alarm.
On ‘ALARM’ the SGC board can be configured to automatically dial out
to the remote site or service centre. Two telephone numbers can be
stored within the memory. The primary number will be tried
preferentially but the system will revert to the secondary number should
the primary connection prove unsuccessful.
An LED located on the SGC board flashes at two hertz per second when
communication is taking place.
A software package is provided with the option to be used with the PC.
This software is used to configure the system and to run the diagnostics.
It has a screen driven menu with an on screen help facility. The software
can be operated in several languages which are set up at the terminal.
Each terminal can be set up to monitor 1000 UPS.
The remote terminal, as well as receiving information from the UPS, can
interrogate the system. It can do this in two ways:
1. Manual input from the keyboard will allow the operator to select any
one of the UPS on the system and request the current status.
2. The operator may select any or all the UPS from a list residing in the
computer and call automatically, overnight if necessary.
4.6.1 Introduction

Liebert 7400 Series Specifications

General

Brand	Liebert
Model	7400 Series
Category	UPS
Language	English