Vertiv | Liebert PEX4 | User Manual 51
Installation
No. Description No. Description
1 Customized alarm terminal/ water under oor
sensor
4 RS-485 interface
2 37/38 are short connection remove this short
wire at remote shutdown
5 CANH/CANL terminal
3 External general alarm
Figure 2-32 Enlarged View of Terminal Block
Before connecting the control line, it is mandatory to perform the corresponding anti-static measures.
2.8.4. Connecting Water-Under-Floor Sensor
Each unit is equipped with a water-under-oor sensor. Connect one end of the sensor to terminal 51# and the
other end to the common terminal 24#. The number of the sensors in parallel connection are not limited, but
each unit has only one water-under-oor alarm.
2.8.5. Remote Shutdown
As shown in Figure 2-32, 37# and 38# terminals can connect to remote shutdown switch, and they have been
shorted in the factory and the shorting cable must be removed if the terminals are to be connected to the
remote shutdown switch.
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