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Digital Dosing Units
33
Alarms
Several alarm options are available for the Digital Dosing feeder. The standard unit comes with
a flashing alarm symbol
on the faceplate. Options include both audible horns and flashing
lights. An optional no voltage alarm relay can be connected to the user’s central alarm system.
Level Probes
To adjust the level probes:
1. Turn the controller ON.
2. Fill the dosing station until the level sensor is one-third covered.
3. Remove the small plastic screw (M3) on the back of the level sensor (see Figure
7).
LED Yellow (Station)
on: Station Filled
off: Station Emptied
LED Green (Level Probe)
on: Power Supply Available
off: Power Supply Not Available
Trim-pot with
Plastic Screw M3
Cable
Blind Lid
Protective Screw
npn: Normally Closed
pnp: Normally Open
10
npn: Normally Open
pnp: Normally Closed
Level Probe
Figure 7. Level Sensor Screw
4. Turn the trim-pot until the yellow control lamp just switches off.
NOTE: Turning the trim-pot to the left decreases the switching sensitivity; turning it to the
right increases the switching sensitivity.
5. Fill the dosing station until the level probe is two-thirds covered. The yellow
control lamp should now switch on again. If not, repeat Step 4.
6. Reinstall the plastic screw (M3).
NOTE: The sliding switch under the cover must be set on “0”.