Filter
Top Products
Delay Relay Output Board Option Hydrastep 2468CB and 2468CD Manual
3b-8 24685034
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-energise the 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)
(Switch SW6 set for fault signal operation)
Alarm off when contacts closed
Even fault relay
(LH input board)
RL 1
1
4
3
2
To alarm annunciator
RL 1
1
4
3
2
PL 2 PL 2
Odd fault relay
(RH input board)
Alarm off when contacts open
Even fault relay
(LH input board)
RL 1
1
4
3
2
To alarm annunciator
RL 1
1
4
3
2
PL 2 PL 2
Odd fault relay
(RH input board)
Note: Systems with a local display have an opto-isolated system fault available from the
display board.