Omega CN3440 Electrical Installation, Access to Terminals Fig, Setting Input Selector Links .2A

4 ELECTRICAL INSTALLATION

Warning. Before making any connections, ensure that the power supply, any high voltage-operated control circuits and high common mode voltages are switched off.

Note.

•Always route signal leads and power cables separately, preferably in earthed metal conduit.

•It is strongly recommended that screened cable is used for signal inputs and relay connections. Connect the screen to the ground stud.

Information. Use cable appropriate for the load currents. The terminals accept cables up 12AWG (2.5mm2).

4.1Access to Terminals – Fig. 4.1

For access to terminals – refer to Fig. 4.1, steps 1 to 3.

4.2 Setting	the	Input
Selector Links – Fig. 4.2A

Plug-in links on the microprocessor p.c.b. are positioned according to the type of Process Variable Input, Remote Set Point Input and Valve Position Feedback Inputs used.

Remove the instrument front panel – see Fig. 4.1, steps 1 to 6.

Referring to Fig. 4.2A, set the link positions for the input type required.

4.3 Setting	the	Isolated
Output Link – Fig. 4.2B

Aplug-in link (PL7) on the microprocessor p.c.b. is positioned according to the isolated output required, either a current proportioning control output (programmable

in range 0 to 20mA) or a 12V logic output (minimum load 400Ω). Referring to Fig. 4.2B

– steps 1 and 2, set the link for the output type required.

To use a 12V logic output, the control type must be set to Time Proportioning Control – see Fig. 3.1 of the Programming Guide.

	6Remove front	5Remove cap
		and screw
	panel
1slide
down
2Pull out	4Remove front
slightly…		panel screws
2	3 Slacken captive screws and
…and
slide off	remove protection cover
Fig. 4.1 Access to Terminals and Processor Board
6