Chapter 6 Communication 53
Liebert
®
ITA 16kVA And 20kVA UPS User Manual
In emergency conditions, close the REPO switch (prepared by users) 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 of
electronic control tripping function is adopted at the UPS input, the REPO switch can help the switch trip and thus cut
off the UPS input power. The position of the REPO switch is shown in Figure 1-3, and the REPO cable connection is
shown in Figure 6-3.
Figure 6-3 REPO cable connection
The cable connection procedures are as follows:
1. Loosen the ‘+12V’ and ‘EPO_IN’ connection terminals of the REPO port.
2. Insert the two ends of the copper core cables with the insulation leather peeled into the ‘+12V’ and ‘EPO_IN’
connection terminals of the REPO port, and press down the terminals. The REPO cable is complete. Ensure that the
REPO cable is firmly connected to avoid no action or wrong action of the REPO caused by accidental dropping or
infirm contact.
3. For parallel UPSs, when connecting the REPO cable, users should parallel connect ‘+12V’ of the REPO port with
one end of the electronic switch, and parallel connect ‘EPO_IN’ with the other end of the electronic switch. Note the
difference between the port silkscreen ‘+’ and ‘-‘ during connection.
When the REPO switch at the user end closes, the UPS will generate an alarm and cut off the output immediately,
and the UPS will not return to the normal operation state automatically. At this point, you must change the REPO
switch state, and power on the UPS manually.
Note
1. It is recommended to use 0.82mm
2
~ 0.33mm
2
(signal cable of 18AWG ~ 33AWG) copper core cable.
2. If the switch you have configured is of electronic control tripping function, when the REPO signal takes action, you need to close
the switch before restart the UPS.
6.3 Connecting USB Communication Cables
The USB port is located on the rear panel of the UPS, as shown in Figure 1-3.
The USB port can connect the monitoring software.
The methods to connect the communication cable are as follows:
Insert one end of the USB communication cable to the USB port (see Figure 1-3) on the rear panel of the UPS, and
connect the other end to the USB port of the computer.
After the connection, you need to install the USB drive program in the installation disk.
