Sterling Doll BF3-600 Manuale Utente

Digital Dosing Units

NOTE: Zero input corresponds to zero screw speed and no additive dosing. Maximum input
corresponds to maximum screw speed.

NOTE: If a 0-10kHz frequency input is used, it must be a square wave with an amplitude of
12VDC. The shape of the signal is important, especially above 7,000Hz.

J12-4

J12-3

0-10vdc or 0-20ma

Extruder

output Digital Dosing controller

(diagram of frequency inputs)

Figure 6. Frequency Inputs

5. Make sure the unit is turned OFF before plugging it in. The switch toward the rear of

the controller unit should be in the OFF, or “O” position. Standard operation voltage is

110 or 220 VAC, 50/60 Hz, single-phase power. Special voltages are available, refer to

voltage label on the feeder to determine the correct operating voltage.

3.2 Initial Operation

The control system is factory-programmed. Nevertheless, specific values need to be predefined

or checked prior to operation (basic parameter settings). The input values will be saved and will

still be available if the unit is switched off, or a power failure occurs. Please refer to Appendix

B for these values. Extrusion operations require a “span factor” to be entered into the basic

settings. Please refer to Appendix B.

Prior to putting your new Digital Dosing Additive Feeder on-line:

• You must enter a recipe and calibrate the feeder.