
Delay Relay Output Board Option | Hydrastep 2468CB and 2468CD Manual |
3b.3.2.5 ‘Two out of Four’ Relay Alarm System
In the following diagrams (5A & 5B) indicate the electrode channel selected for each relay. 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 ES, a healthy system would trip at level 10.
Case A - Relays normally energised,
(Relays shown in
RL 1
3
RL 2
1
Odd electrodes (RH input board)
PL 2
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
RL 1
4
RL 2
2
Even electrodes (LH input board)
1 | PL 2 |
| |
2 |
|
3 |
|
4 | To alarm |
annunciator | |
5 | or tripping |
device |
6
7
8
Alarm off when contacts open
(Switch SW5 is set to EW for
Case B - Relays normally energised,
| (Relays shown in |
| ||
RL 1 | PL 2 | RL 1 | PL 2 | |
1 | 1 | |||
|
| |||
| 2 |
| 2 | |
3 | 3 | 4 | 3 | |
| 4 |
| 4 | |
| 5 |
| 5 | |
RL 2 | 6 | RL 2 | 6 | |
|
| |||
1 | 7 | 2 | 7 | |
8 | 8 | |||
|
| |||
Odd electrodes |
| Even electrodes |
| |
(RH input board) |
| (LH input board) |
|
Alarm off when contacts open
(Switch SW5 is set to EW for
To alarm
annunciator
or tripping
device
| 24685034 |