
Delay Relay Output Board Option | Hydrastep 2468CB and 2468CD Manual |
3b.3.2.7 ‘Two out of Three’ Relay Alarm System
In the following diagrams (7A & 7B) indicate the electrode channel selected for each relay. A fully functioning system (NO FAULTS) will cause a low level trip at electrode level 2. Using
Case A - Relays normally energised,
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RL 1 | 1 | PL 2 | RL 1 | 1 | PL 2 |
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| 2 |
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| 2 |
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3 | 3 |
| 2 | 3 |
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| 4 |
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| 4 | To alarm |
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| annunciator | ||
| 5 |
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| 5 | or tripping |
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| device | ||
RL 2 | 6 |
| RL 2 | 6 |
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| 7 |
| 2 | 7 |
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1 | 8 |
| 8 |
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RL 3 | 1 |
| Even electrodes |
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| 2 |
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1 | 3 |
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| 4 |
| Alarm off when contacts closed |
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Odd electrodes |
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(RH input board) |
| PL 3 |
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(Switch SW5 is set to EW for
Case B - Relays normally energised,
| (Relays shown in |
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RL 1 | PL 2 | RL 1 |
| PL 2 |
1 | 1 |
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| 2 |
| 2 |
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3 | 3 | 2 | 3 |
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| 4 |
| 4 | To alarm |
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| annunciator | ||
| 5 |
| 5 | or tripping |
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| device | ||
RL 2 | 6 | RL 2 | 6 |
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| 7 | 2 | 7 |
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1 | 8 | 8 |
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| Even electrodes |
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RL 3 |
| (LH input board) |
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1 |
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| 2 |
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1 | 3 |
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| 4 | Alarm off when contacts open |
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Odd electrodes | PL 3 |
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(RH input board) |
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(Switch SW5 is set to EW for
| 24685034 |