Sterlco SF1000 Gravimetric Additive Feeder - Manual (Page 27)

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Material container is empty Refill it
No command order to air valve Check cable or consult maintenance
dept.
"Overdose" Alarm
Overdose situation (required motor
current is above 100% - its
maximum possible rate) Check process data (product weight
and required MB %). If data O.K.,
consider replacing dosing screw with
a higher range type
"Overdose" Alarm
Underdose situation (required
motor current is below
5.2% - its
minimum possible rate)
Check process data (product weight
and required MB %) and if O.K.,
consider replacing dosing screw with
a lower range type.
Calibration error –
"Offset too low"
Load cell is in "Locked" state Unlock load cell (see App. A)
Load cell is out of order Replace it
Controller is out of order Consult Maintenance dept.
Calibration error – "Gain
too low"
Standard calibration has not been
installed in the hopper, or its value
does not match entered value Check and enter weight or update
value, if required
Load cell is in "Locked" state Unlock load cell (see App. A)
Load cell is out of order Replace it
Motor does not
rotate at first starting, or
during standard
operation
Motor cable is damaged or not
connected - Check its connection to the
controller, or
- Repair or replace it if required
MB % (“D”) is set to “0"
Correct MB % if required
No rotating command from the
controller Consult maintenance dept.
Motor or motor's controller is
defective Consult maintenance dept
The screw is "stuck" by the material Empty hopper, release screw, clean
it and its housing and reinstall it
There is no "Sensor" signal from
the IMM Consult maintenance dept
Sensor Input is analog (voltage)
instead of "dry contact" Install a relay to switch from voltage
to dry contact input
No materials dosing,
despite motor rotating
Material blocked at inner weighing
hopper outlet due to some obstacle Empty hopper and clean it
Material blocked at the outlet of the
inner weighing hopper due to
material bridging Ask for help - there might be
electrostatic charge or material is too
sticky and can't be used with this
feeder
Material blocked at screw's exhaust
tube and doesn't stream out -Try to replace the screw with
another type
-Ask for help
— it might be that the
material is too sticky and can't be
used with this feeder