Wiring and Connections - Main Board

4.2.3Setting the Digital Output Jumpers

Each digital output has an associated jumper to define its operation when power is interrupted and there is no battery backup to the board. This puts the Universal Monitor in a fail-safe mode and ensures proper functioning when the board has no power or battery backup.

The Universal Monitor comes from the factory with all digital output jumpers in the OFF position (nor- mally open). The jumper setting for each digital output can be changed to ON (normally closed). The settings are shown in Table 8.

Table 8

Digital output jumper settings

 

 

 

Output status

Setting

(power loss & no battery backup)

OFF

Normally open

 

 

ON

Normally closed

 

 

To change the output jumper setting:

1.Find the respective black output jumper on the circuit board, as shown above.

2.Decide whether your configuration requires the jumper to be OFF or ON.

3.Set the jumper as needed:

Set the jumper to OFF by placing the black jumper on the middle and top pins.

Set the jumper to ON by placing the black jumper on the middle and bottom pins.

Digital output jumpers

ON OFF

PFM2

ON OFF

PFM5

REV

TB3:

RELAY OUTPUTS

(BOTTOM)

(TOP)

8 4

7 3

6 2

5 1

(BOTTOM)

(TOP)

8 4

7 3

6 2

4.3Connecting Analog Inputs

The analog input connector blocks are at the bottom center of the Universal Monitor printed circuit board. The blocks are two-part assemblies to permit easier connections. To determine the proper wire size, see Table 7 - Wiring specifications - main board.

To connect an input:

1.Turn OFF electrical power to the Universal Monitor.

2.If necessary, remove a conduit knockout to permit wire entry into the Universal Monitor enclosure.

3.Bring the wire(s) into the Universal Monitor enclosure through a conduit knockout or access slot.

4.Loosen the appropriate screw and slip the stripped end of the wire into the terminal block.

5.Tighten the screw until it holds the wire snugly.

Analog inputs

Analog ground

1-2 TOP

3-4

0: COMMS

(TOP) + + +

 

422

 

 

 

 

 

 

 

AG

TB9: ANALOG

(BOTTOM)

+

 

 

+

 

+

 

 

 

 

GROUND

22

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Liebert Universal Monitor Connecting Analog Inputs, Setting the Digital Output Jumpers, Digital output jumper settings