Liebert Universal Monitor user manual Connecting Digital Inputs and Digital Outputs

Wiring and Connections - Main Board

4.2Connecting Digital Inputs and Digital Outputs

The digital inputs and digital outputs are found on the lower right side of the Universal Monitor’s printed wiring assembly board. There are two terminal blocks for the inputs—one green, the other black. There are two terminal blocks for the outputs—one green, the other black.

To determine the proper wire size, see Table 7 - Wiring specifications - main board.

NOTE

Each terminal block is a removable, two-part assembly to permit easier connection of more than one input at a time. If making multiple connections, grasp the upper portion of a block and pull firmly to the right until the assembly pulls apart.

After making the connections, push the removed piece back into the portion attached to the printed wiring assembly until the terminal block pieces lock together.

4.2.1 Connecting Digital Inputs

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	ON OFF	PFM2
	enclosure through a conduit knockout or
		ON OFF	PFM5
	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.

4.2.2 Connecting Digital Outputs

To connect an output:

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.

REV

ASS

TB3:
RELAY					OUTPUT TERMINAL BLOCKS -
					Note numbering of outputs
			8		begins at the bottom and
					proceeds up; numbering
3			7		keys are shown at right
2			6
1			5			Numbering keys
		(BOTTOM)
	(TOP)
				8
	4
				7
	3
				6
	2
				5
	1				INPUT TERMINAL BLOCKS -
INPUTS
					Note numbering of inputs
					begins at the bottom and

proceeds up; numbering keys are shown at right

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.

! CAUTION

To reduce the risk of fire or electric shock, do not interconnect the outputs of different Class 2 circuits.

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