Liebert Autochangeover Controllers AC4 사용자 설명서

One of four output jumpers. Each digital output has a 

jumper to set the fail-safe position of the output point when 

power fails. The OFF position makes the contact Normally 

Open (factory default). The ON position makes the contact 

Normally Closed.
Note: The jumper position has no effect on the contact 

when the AC4 has power.

Each of the four input connections is a two-state point: ON/

OFF (energized/de-energized).
An example of a field digital input is a Liebert 

Environmental unit’s common alarm relay output.

Each input has an LED to indicate its status: ON/OFF 

(energized/de-energized).

Connection for laptop or video terminal. Used for 

configuration and monitoring using the Service Terminal 

Interface. Requires a null modem cable for connectivity 

(P/N 201258P1).

DIP switch used for resetting password to default.

Connection for the LCD on the enclosure door.

N/A

Adjustment contrast for the LCD on the enclosure door.

N/A

Power connection for the controller. Requires 24VAC.