46 Chapter 6 Communication
Liebert
®
ITA 10kVA UPS User Manual
6.2.3 RS485 Card
The RS485 card should be used together with the Liebert
®
ITA series UPS of Emerson to realize the signal transform
from RS232 to RS485.
For the detailed installation and operation guide of the RS485 card, refer to the relevant user manual.
6.2.4 RS232 Card
The RS232 card should be used together with the Liebert
®
ITA series UPS of Emerson. It only supports RS232
protocol communication, and the maximum length of the communication cable cannot exceed 15 meters.
6.2.5 Dry Contact Card
The dry contact card can provide the remote with four routes of relay switch signal outputs: UPS on Battery, Battery
low, UPS on Bypass or in Standby, UPS Faulty. Each dry contact output provides both normally open and normally
closed ports for user to select. The dry contact card can also receive three routes of switch signal inputs, two of which
control the UPS turn-on and UPS turn-off respectively, the third is reserved.
For the detailed installation and operation guide of the dry contact card, refer to the relevant user manual.
6.2.6 Extended Dry Contact Card
Besides the functions of the UPS contact card, the extended dry contact card can also provide RS232 and RS484
communication functions to support JBUS/MODBUS (RTU) communication protocol, and provide four routes of
analog value acquisition function.
For the detailed installation and operation guide of the extended dry contact card, refer to the relevant user manual.
6.3 Connecting REPO Cable
In case of emergency, close the REPO switch provided by user to shut down the rectifier and inverter, and the UPS is
powered off. In normal condition, the REPO switch cannot cut off the UPS input power. If a switch with electronic
control tripping function is used at the UPS upstream input, the REPO switch can help this switch trip and thus cut off
the UPS input power. The specific position of the REPO port is shown in Figure 1-3, and the REPO cable connection
is shown in Figure 6-2.
REPO switch
REPO port
+
-
Figure 6-2 REPO cable connection
The procedures for connecting the cables are as follows:
1. Use the slotted screwdriver to press down the yellow buckle in the REPO port.
2. Insert the two ends of the copper-core cable with the peeled insulation leather into the REPO port respectively, and
loosen the yellow buckle to finish the connection of the REPO cables. Ensure that the REPO cable is firmly
connected to avoid no action or wrong action due to accidental dropping or wrong contact.
3. For the parallel UPSs, when connecting the REPO cable, user should parallel connect the
‘+’ on the REPO port
with one end of the electronic switch, parallel connect the
‘-’ of the REPO port with the other end of the electronic
switch. Pay attention to the difference between the port silkscreen
‘+’ and ‘-’ during the connection.
When the REPO switch at the user end closes, the UPS will generate an alarm and cut off the output immediately.
The UPS will not return to the normal operation state automatically. At this moment, you must clear the REPO switch
state and start up the UPS manually.
警告
危 险
Note
1. It is recommended to use 0.82mm
2
~ 0.33mm
2
(signal cable of 18AWG ~ 33AWG) copper-core cable.
2. If a switch with electronic control tripping function is configured to user upstream, when the REPO signal takes action, you
need to close the upstream MVB again before restarting the UPS.
