Vertiv Liebert XDC, Руководство пользователя

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Vertiv ™ | Liebert® XDC | User Manual 34
• Communication cables
CAN communication is used between the Vertiv™ Liebert® XDC unit and the cooling terminal, and the user needs to connect
the cables on site. The communication cables are from the CANH/CANL terminal of the unit and further connected in series
with the CANH/CANL on each terminal block of the terminal.
RS485 communication is used between the Liebert XDC unit and the condenser, and the user needs to connect the cables
on site, lead the cables from the host RSA/RSB terminal, and then connect in series with the J11 terminal of the condenser.
The connection of the communication cable should a series connection, as shown in
Figure 3-4 .
Figure 3-4 Control Cable Connection
Note: The communication cable must be a shielded twisted pair, away from strong interference sources, and ensure that
both ends of the shielding layer are grounded.
Note: The communication cables and power cables must be routed separately.
• Remote shutdown
Figure 3-3 shows the terminals 37# and 38# that can be connected to the remote shutdown switch. The terminals have been
short-circuited in the factory. When a remote shutdown is required, remove the short-circuit cables.
Note: When the 37# and 38# terminals are disconnected, the unit will shut down.
• Self-defined alarm terminal
Terminals 50#, 51#, 55# can be connected to 3 kinds of sensor inputs, and terminal 24# is a common terminal. It can also be
defined as a fire sensor, etc. After the external alarm signal is connected to the self-defined terminal, the corresponding self-
defined alarm content needs to be set in the Liebert PACC controller. Refer to the Liebert PACC self-defined alarm setting in
Appendix II .
When the contact is disconnected and there is no external alarm, the self-defined terminal input state is On. When the
contact is closed, after an external alarm occurs, the self-defined terminal input is in a short-circuit state, the air conditioning
system will sound an alarm, and the Liebert PACC controller LCD display will display the corresponding alarm content.
A smoke alarm switch can be connected between the 50# and 24# terminals.
Remote alarm can be connected between 37# and 38# terminals.
• External general alarm terminals
The external general alarm can be connected to the 75# and 76# terminals, and its output is used to trigger the external
alarm devices, such as alarm lights. When a major alarm occurs, the contact is closed. This can be used to send out remote
alarms, signal to the building management system or automatically dial the paging system. The user needs to provide the
power supply of the external public alarm system circuit.
For other terminal definitions, refer
Appendix I Liebert XDC Circuit Diagram .