Emerson 2468CB, 2468CD manual 3c-12

Opto-isolated Output Board Option Hydrastep 2468CB & 2468CD Manual

3c.3.2.5 ‘Two out of Four’ Opto-output Alarm System

In the following diagrams (5A & 5B)  indicate the electrode channel selected for each opto-output. A fully functioning system (NO FAULTS) will perform a low level trip at electrode level 3. For a high level trip, using electrode channels 11, 12, 9 and 10 respectively and switch SW5 set for W, a healthy system would trip at level 10.

Case A - Opto-output circuit normally open circuit, short circuit one pair to trip

PL 2

TR2	3	1
		2
		3
Opto-output 1		4
TR4	1	5
		6

	7
Opto-output 2	8
Odd Electrodes
(RH Input Board)

TR2 4

Opto-output 1

TR4 2

Opto-output 2

Even Electrodes (LH Input Board)

PL 2

1	Note:	External power must
		be applied as shown.
2		See specification for
		power requirements
3
4		+ VE
5		To alarm
		annunciator
		or tripping
6		device
7		- VE
8

(Switch SW5 is set to S for low level alarms and set to W for high level alarms)

Case B - Opto-output circuit normally short circuit, open circuit one in each pair to trip

PL 2

TR2	3	1
		2
		3
Opto-output 1		4
TR4	1	5
		6

	7
Opto-output 2	8
Odd Electrodes
(RH Input Board)

TR2 4

Opto-output 1

TR4 2

Opto-output 2

Even Electrodes (LH Input Board)

PL 2

Note: External power must

1be applied as shown. See specification for

2power requirements

3
4	+ VE
5	To alarm
	annunciator
	or tripping
6	device
7	- VE
8

(Switch SW5 is set to W for low level alarms and set to S for high level alarms)

3c-12 24685034