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Chapter 4: Operation 39 of 60
is that the extruder speed will be slowly adjusted as the output of the extruder drops
over time due to the screen pack becoming clogged.
NOTE: The GH System can be started using your older speed pots by first placing the
system into “Monitor Mode”. After you receive a “Steady Process” in “Monitor Mode”
you can then transfer to “Step 1” mentioned above. Starting the system in “Monitor
Mode” takes longer and requires a double stabilization step.
NOTE: You can always go from any mode to “Stop Mode”
NOTE: You can always go from “Weight Mode” to “RPM Mode”
NOTE: You cannot go from “RPM Mode” back to “Monitor Mode” because the GH
does not know where the speed pots are set at. This is a safety and can be bypassed only
by placing consulting the factory for details.
4-3 GH-F Gravimetric Feeder Operation Procedures
The system will automatically start loading the hopper after the operator has first placed the
GH-F feeder in either “RPM Mode” and enters in a target RPM for the feeder or “Weight
Mode” and the system observes an extruder RPM measured by the extruder tracking
proximity switch that is mounted on the rear of the extruder. It is important to note that you
cannot write the extruder RPM measurement through communications on a GH-F feeding
system. You must mount the extruder proximity switch that is shipped with the unit.
Operator Displays
Figure 33c: Typical Operator Screen for GH Full Control system
Follow these steps to run the line:
1. Place the Feeder into either “RPM Mode” (no extruder tracking) or “Weight Mode”
(extruder tracking, start extruder first)
2. If in RPM MODE enter in a target RPM for the feeder and the feeder will run at that
RPM regardless of the extruder. This is useful for feeder calibration the first time
you run the system with a new auger size.
3. If in WEIGHT MODE enter in a desired % and let the system track the extruder
RPM. You should not consider you are making good product until you see the
“STEADY PROCESS” flag.
4. If in WEIGHT MODE the system will automatically stop once the extruder stops.