Emerson 2468CD Manual do Utilizador descarregar pdf (Página 81)

Hydrastep 2468CB and 2468CD Manual Relay Output Board Option

24685034 3a-13

In the following diagrams (6A & 6B)

 indicate the electrode channel selected for

each relay. A fully functioning system (NO FAULTS) will perform a low level trip at electrode

level 2. For a high level trip, using electrode channels 9,10, 11 and 12 respectively and

switch SW5 set for ES, a healthy system would trip at level 11.

Case A - Relays normally energised, de-energise one in each pair to trip

(Relays shown in de-energised state)

(Switch SW5 is set to EW for low-level alarms and set to ES for high-level alarms)

To alarm

annunciator

or tripping

device

RL 1

RL 2

RL 1

PL 2

Odd electrodes

(RH input board)

Even electrodes

(LH input board)

Alarm off when contacts closed

Case B - Relays normally de-energised, energise one in each pair to trip

(Relays shown in de-energised state)

(Switch SW5 is set to EW for low-level alarms and set to ES for high-level alarms)

To alarm

annunciator

or tripping

device

RL 1

RL 2

RL 1

PL 2

Odd electrodes

(RH input board)

Even electrodes

(LH input board)

Alarm off when contacts open

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Emerson 2468CD Manual do Utilizador Página 81