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Deadband (DB Control) adjustment

The deadband control adjusts the point at which a tripped alarm

resets. This point will be above the setpoint for a low type alarm or

below for a high type. The procedure for adjusting the DB control is as

follows:

1. Adjust the SET control as above.

2. S

et source B to 4 mA.

3. Set the deadband to maximum by turning the DB control fully

clockwise.

. Trigger the alarm by setting source A to 20 mA (for a high type

alarm) or 4 mA (for a low type alarm).

Set source A to give the differential current at which the alarm

should reset.

Decrease the deadband (turn control anticlockwise) until the LED

extinguishes.

7. C

heck that the setpoint and deadband are set correctly.

Internal settings (Alarm type and coil energisation)

To change the alarm type or coil energisation:

1. Remove the left hand side plate.

2. S

et the links according to the diagram (right).

3. Replace the side plate.

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