User guide

TrueFeed manual

7.6 Material pre-calibration

The TrueFeed can be started in two ways:

1) Without

pre-calibration of material.

After pressing the “START” button the TrueFeed starts feeding at a speed that is based on default curves

which are pre-programmed within the control. After start-up, the unit continues with self-calibrating to

setpoint.

2) With

pre-calibration of material (OFF-LINE).

After pressing the “START” button the TrueFeed starts feeding at a speed that is based on material

calibrations made by the user that are stored within the control. After start-up, the unit continues with fine-

tuning to setpoint.

What is the function of a material Pre-calibration?

With a pre-calibration it is possible to calibrate the unit before production begins, reducing the time for the

TrueFeed to be within tolerance. The TrueFeed is a gravimetric/loss-in-weight feeder. When starting up the

feeder for a new production run, there is no direct information available about the loss in weight. Starting the

unit at a speed that is already near to the setpoint will achieve quicker regulation. The correct RPM at the start

of the feeder can be determined automatically with a pre-calibration.

The pre-calibration can performed in two (2) ways:

1) Unit with the optional slide frame: 2) Unit without optional slide mechanism:

Slide the frame with unit backwards till the “click” Remove the feeder and place it on the frame as shown

• It is important that during calibration, the feeder is mounted fixed, horizontally and vibration free.

• Before starting a pre-material calibration, ensure that the hopper is filled with material.

• Ensure that the load cell cable is connected to the TrueFeed control.

Following parameters will be stored with the Material calibration, depending on the CONFIGURATIONS:

• CONFIGURATIONS parameters: Cylinder type : Type of dispensing cylinder or feed screw

Material Type : Normal or micro-granules

• PRODUCTION parameters: Shotwth. : Shot weight

color% : Color amount (%)

dos. time : *Feeding time (sec)

Ext. cap. : Extruder capacity (kg/h)

• CALIBRATION parameters: Material name : Name of calibrated material

* Screw recovery time for an injection molding machine.