Emerson 2468CB, 2468CD manual 3b-8

Delay Relay Output Board Option Hydrastep 2468CB and 2468CD Manual

3b.3.1.3 Relay Energisation (‘In Steam’ or ‘In Water’) - SW5

This is a four-channel switch, one channel allocated per relay. The choice presented by each channel switch is whether the relay is energised when the particular electrode is in water or energised when that electrode is in steam. This switch is highlighted in Figure 3b.1 (on page 3b-6) to provide additional information on channel identity and the switch ‘electrode state’.

3b.3.1.4 Electrode/Alarm Operation (RL1 function only) - SW6

Relay 1 can be configured to receive either an electrode input or it can be used as the ‘system fault’ relay. The two positions are detailed in Figure 3b.1 (on page 3b-6). When configured as the system fault relay, the normal (non-fault) state of the relay is energised.

The system fault output connections are shown in the next section.

3b.3.1.5 System Fault Output

Relay 1 on each delay relay board can be configured to be a system fault relay by setting SW6. When used as a system fault relay the normal state of the relay is energised and a fault state will de-energisethe relay.

The relay will only output faults detected by the input board onto which it is installed. With a dual power supply Hydrastep unit, this means it is necessary to used two delay relay boards (one on each input board) to create a system fault output.

			(Relays shown in de-energised state)
RL 1	1	PL 2	PL 2	1	RL 1
	2			2
	3		To alarm annunciator	3
	4			4
Odd fault relay					Even fault relay
(RH input board)		Alarm off when contacts closed			(LH input board)

RL 1		PL 2	PL 2	RL 1
	1			1
	2			2
	3			3
	4		To alarm annunciator	4
Odd fault relay				Even fault relay
(RH input board)				(LH input board)

Alarm off when contacts open (Switch SW6 set for fault signal operation)

Note: Systems with a local display have an opto-isolated system fault available from the display board.

3b-8 24685034