Emerson 2468CB, 2468CD manual 3a-8

Relay Output Board Option Hydrastep 2468CB and 2468CD Manual

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

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

3a.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 (see Figure 3a.1 on page 3a-6). When configured as the system fault relay, the normal state of the relay is energised, a fault state will de-energise the relay. See the next section for contact output details.

3a.3.1.5 System Fault Output

Relay 1 on each relay board can be configured to be used as 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 relay boards (one on each input board) to create a system fault output.

		(Relays shown in de-energised state)
RL 1		PL 2	PL 2	RL 1
	1			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.

3a-8 24685034