4 Alarm Messages- Cause and Remedy
4.6 Massflow variances in LWF feeding
Page 78 Docu-No.: 0590020601-EN Rev. 1.6.0
4.6 Massflow variances in LWF feeding
Alarms Cause Remedy
General massflow
fluctuations LWF
• Vibrations and drafts on feeder. Improve the location of the scales.
– Reduce the <CTRL GAIN> in the
<TUNING> menu.
– Increase the filter length display in
program parameter <TUNING>
menu, <DISPLAY FILTER>.
– Increase the tolerance limit in
program parameter <ALARM>
menu, <MF ERR+/->.
– Protect the feeder from drafts and
air currents.
• Irregular discharge. Install different feeder screws when
operating at low feeder-screw
speeds.
Check for material flow problems
such as bridging in the feeder
hopper.
• Irregular motor speed. Re-enter start feeding factor <INIT
FF> in the <PRODUCT CHANGE>
menu and check in volumetric
mode if the speed is constant.
Is the speed constant?
If so:
Re-calibrate the new feeding
factor, reduce the <CTRL GAIN> in
the <TUNING> menu, if necessary.
If not:
Check the motor setting and the
pick-up: verify the discharge feeder
screws are not bound.
• Friction on the scales
(to be ascertained with a static
weight test).
Check all mechanical connections
to the scale, they must be flexible.
The scale may not touch anything.
Replace scale.
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