01AUG 1005GB Cat.20 / Tab. 05.91 / Page 05.04
State of Operation
The state of operation is indicated by the 3 light emitting diodes (LEDs) (Fig. 4, 1.1, 1.2, and
1.3) and the filter differential pressure is indicated in plain text.
LED 1.1 (ON): is illuminated if the unit is operational.
LED 1.2 (> ∆p MIN) is illuminated if the differential pressure is higher than ∆p MIN.
LED 1.3 (>∆p MAX) is illuminated if the differential pressure is higher than ∆p MAX.
LED 1.1 + 1.2 + 1.3 flashes: Alarm – ∆p MAX is exceeded.
Alarm - caused by other reasons: is only indicated by the terminals A1, A2 and A3 (Fig. 5,
3.2).
∆p-text field: The differential pressure is displayed in plain text.
Test operation
Go to the parameter “test operation” and select one of the following testmodes:
In Test mode 0
The test operation is de-activated.
In Test mode 1
Testing the valves. The valves are tested one by one and are displayed in the text field.
In Test mode 2
The state of operation is displayed in the text field.
In Test mode 3
For technical purposes. The value for the AD-converter is displayed.
In Test mode 4-7
The LED’s and the relays are tested and displayed.
∆p -Mode
The ∆p -MIN and ∆p -MAX limits control the filter cleaning.
Setting of ∆p –MODE. See “ Displaying and setting parameters” – parameter no. 19.
If the cleaning procedure controlled by the differential pressure is de-activated, the following
text is displayed “Delta-P Mode OFF”.
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