Sterlco SF1000 Gravimetric Additive Feeder - Manual (Page 22)

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If the process conditions require a very low speed,
below the motor's low limit, an Under-Speed alarm
screen will be displayed, warning that the motor has
reached its minimum speed (2.5%) and the actual
flow is over the desired flow.
Check the entered process data (product weight and
required % MB
) and consider replacing the dosing screw with the “higher-range” type.
 Press to return to Main screen
4.7 .3 “Calibration failure” Alarms
Calibration alarms might be displayed if the "IC" (Internal Count) value is too low, either
during Offset calibration or Gain calibration. Cause could be: either an un-released load cell
(see appendix A), or damaged or unconnected load cell, or wrong selection or definition of
the standard weight during gain calibration, or defective controller. In order to proceed with
the calibration procedure, it should be repeated from the beginning.
If the calibration procedure has failed during the
Offset calibration (IC- Internal Counting value is less
then 200), following alarm is displayed:
If the calibration procedure has failed during the Gain
calibration (IC- Internal Counting value is less then
the entered Standard Weight), following alarm is
displayed:
4.7.4 Feed Deviation Alarm
When the change in the measured weight of the SF-1000 hopper between 2 successive
shots is irregular - more then twice the set point (the
desired MB shot), but not less then 10 gr., the
controller will disregard this change in his control
calculation, and will issue a Feed Deviation alarm
Notes:
1. The alarm will be announced only during Gravimetric mode (the deviation is irrelevant
during Volumetric mode).
2. The deviated batch will not be taken in account in the control process, but it will be
added to the accumulative measurement and display.
3. Unlike other alarms, this alarm
doesn’t activate the Alarm Output, as well as regard to
the Alarm sign at the left screen corner.