Sterlco SF1000 Gravimetric Additive Feeder - Manual (Page 26)

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5.6 Trouble shooting
Check the following guide for possible problem causes before contacting service:
Symptom Possible cause Correction actions
Controller does not work
Power cord is damaged or
disconnected -Check cable
-Plug it into the power outlet
Fuse is blown Replace fuse
No weighing or
unreasonable weighing
results
Load cell is not connected Connect load cell to its connector in
the controller
Load cell safety catch is still in
"locked" position (see App. A) Release safety catch to "Unlock"
position (see App. A)
Load cell cable is damaged or not
connected -Check connection to the controller
-Repair or replace if required
The nuts fixing the load cell to the
weighing hopper are loose Refasten the nuts
Adjustment of load cell protection
device has been changed, and the
limiter is no longer centered
(clearance is less than 0.5mm) Readjust the clearance according to
instructions in Appendix A
Static calibration has been changed
for some reason Repeat calibration procedure
according to Appendix B
Load cell is damaged Replace it
No free clearance (there is some
obstacle) between internal and
external hoppers Check for reason and clear it
Controller fault Consult maintenance dept. or ask for
service
Unreasonable reducing
of motor current
percentage (rpm)
Penetration of vacuum from the
main material hopper loader into the
machine's neck.
This vacuum sucks material from
the Sterling SF-1000 hopper and
thus disrupts the control operation - Check sealing of the hopper
loader’s emptying valve
- Release undesired vacuum in the
neck by drilling small holes in neck's
sight glass, or by installing small
discs (spacers) on its screws,
creating a narrow releasing slot.
Significant discrepancy
between desired % value
and actual measured
value
The pulse arriving from the injection
machine is not steady; there are
"dips" which the controller interprets
as more than one pulse.
It can be detected by comparing the
value of accumulative cycles in the
Sterling SF-1000 controller to that of
the IMM controller Try to improve the pulse quality
Too slow convergence to
final desired % Entered screw type parameter does
not match actual screw in use Enter Parameters screen, and
replace screw type, if necessary
"No Fill" Alarm
Air valve does not work Check air supply
Check air valve