User guide

TrueFeed manual
16
CONFIGURATIONS: Control mode
(GRAVI) Gravimetric mode or (RPM) Rotating mode
• Gravimetric mode (GRAVI) is set as default and functions on the basis of loss-in-weight principle.
The output is measured and regulated continuously by controlling the motor speed.
• Volumetric mode (RPM) can be used if no automatic feedback of the weight is required.
The weighing will not function in this mode and the automatic hopper loader function will not operate.
CONFIGURATIONS: Prod. mode
Production mode
Type of processing machine the TrueFeed is mounted upon. (EXT) extruder or (INJ) injection molding
CONFIGURATIONS: Input mode
Type of input signal. Relay, Timer or Tachometer
Timer mode is the standard setting for Injection molding.
CONFIGURATIONS: Input filter
The setting “input filter” becomes visible when Relay Input mode is selected in INJ mode.
In Relay Input mode the length of feeding time is measured automatically from the incoming
input signal. The Input Filter calculates the average feeding time of the set number of shots (3-32)
The calculated average time is used as consistent feeding time. The default Input Filter setting is 3.

Input mode is not visible in RPM Production mode. (Timer mode is used automatically)
 For INJ mode in Timer mode, the start pulse should be a minimum of 0.2 seconds.
For INJ mode in Relay mode, the start signal should be as long as the feeding time.
If INJ mode in Relay mode is selected, the TrueFeed will follow the machine relay time. The control will filter
out small changes so that the regulation is not affected. Large changes will be followed.
The TrueFeed display will show the actual machine relay time.
Input (start) signal
The TrueFeed needs an input signal from the production machine in order to function properly.
Three different types of input signals can be used to control the TrueFeed. See Appendix B for more
information.
1.) A potential free relay contact.
Use the white wire (14) and brown wire (15) for the potential free contact.
2.) A relay signal 24 Volt DC*.
In case of a powered relay signal connect the white wire (14) to the +24 VDC and the yellow wire (12)
to the 0 VDC.
* Note potential contact
Guaranteed OFF: 0-8VDC
Guaranteed ON: 18-30VDC
3.) A tachometer signal up to 30 Volt DC.
This is used when the TrueFeed needs to be connected to an extruder that has a tachometer generator
that produces a voltage linear to the extruder speed. When using a tachometer generator signal, make
a connection between the white wire terminal (14) and brown wire terminal (15), it will function as a start
signal. Connect the positive VDC (green) wire from the tachometer to terminal (13) and the negative
(yellow) wire to terminal (12).
EXT INJ
timer x x
relay x x x
tachometer x x
GRAVI RPM GRAVI RPM