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Digital Dosing Units
21
4. Electrical connection to process machine:
• Injection Molding: Connect the cycle/run slave cable (thin two-conductor
cable) to a set of DRY (NO VOLTAGE) contacts that CLOSE for the duration
of screw recovery. See Figure 5, electrical diagram.
J12-3
J12-2
Relay contact
Injection molding Digital Dosing controller
Machine
(Electrical diagram of connections)
Figure 5. Electrical Diagram
• Extrusion - Constant: Wire the cycle/run slave cable (thin two- conductor cable) to
a set of DRY (NO VOLTAGE) contacts that CLOSE when the screw rotates. See
Figure 5 for electrical diagram.
• Extrusion - Proportional: Wire the cycle/run slave cable to the extruder signal
output that is proportional to the extruder speed. The signal output can be one of
the following: 0-10 VDC or 0-20 mA. Please refer to the labels on the cycle/run
slave cable for the correct input to avoid damaging the controller. Digital Dosing
Additive Feeder should be configured from the factory for each specific input.
See Figure 6 for analog inputs.
NOTE: Voltage from Extruder needs to be isolated. Consult factory for other signal
requirements. External signal converter may be required.
NOTE: Zero input corresponds to zero screw speed and no additive dosing.
Maximum input corresponds to maximum screw speed.
NOTE: If a 0-10 kHz frequency input is used, it must be a square wave width and
an amplitude of 12 VDC. The shape of the signal is important, especially
above 7,000 Hz.