Connecting Input And Output Cables; Connecting Communication Cable - Emerson GXT-RT series User Manual

Liebert GXTRT Series
1-3 kVA UPS
Note
The external battery cable delivered with the long back-up time power module is 1.8m long. If
users need a longer one, please consult the distributor. There is a limit to the length of the
external battery cable to ensure normal operation of the UPS.

2.5.2 Connecting Input And Output Cables

Warning
1. The max output current of each load output shall not exceed the current marked by
screenprint at the output sockets and output terminal block, the total output power shall not
exceed 0.7kW for 1kVA UPS, 1.4kW for 2kVA UPS, and 2.1kW for 3kVA UPS.
2. Make sure that the input plug and load plug match the power module's input socket and
output socket respectively.
3. Non-professionals shall not make cable connection to the output terminal block at the rear
panel of the 3kVA power module; when connecting load cable to the output terminal block,
make sure that the neutral line and live line are not reversed connected.
Connect the input cable between the user's mains socket and the input socket of the power
module, and insert the load plug into the output socket of the power module.

2.5.3 Connecting Communication Cable

DB9 communication port
Where users need to use the single UPS monitoring software delivered with the power module
to monitor the UPS, in communication cable connection, just locate the RS232 cable delivered
with the power module, and insert the two cable plugs respectively into the RS232 port of the
computer and the DB9 port at the rear panel of the power module.
The DB9 port can be used for dry contact communication as well as RS232 serial
communication. Its pin assignment is shown in Figure 2-9, the pin description appears from
Table 2-3, and its dry contact port principle is shown in Figure 2-10.
Table 2-3 DB9 port's pin description
Pin
Low Battery (output dry
1, 7
contact)
2 UPS RxD (RS232 standard)
3 UPS TxD (RS232 standard)
Remote Inverter Off in Battery
4, 5
Mode
5 Common GND
6 NC
8, 9 On Battery (output dry contact)
Page 16
Figure 2-9 DB9 port's pin assignment
Description
1. Pin1, Pin7 dry contact output: open
when the battery voltage is normal,
shorted when the battery voltage is low.
2. Pin9, Pin8 dry contact output: open
when the UPS is not on battery, shorted
when the UPS is on battery.
3. Pin4, Pin5 dry contact input: in Battery
mode, when at high level (5~12Vdc, for
more than 20s), the UPS is turned off;
when open or at low level input, the UPS
maintains the original state.
9/2005
Installation and User Manual
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Emerson Network Power