332312A - E4-5 Meter-Mix Dispense System, Operation ... - Graco Inc.

Testing ProceduresNOTE: Other modes require the “Screw Rotate Signal”from the injection molding machine to activate the pump.Ratio Test Mode does not require this signal and thepump will ignore most of the fault conditions to allow theuser to test the system. The material outlet valves willremain closed to ensure the entire sample is being dispensedout through the ratio sample valves.7. Open the Pump Bleed Valves located at the top ofthe pump and collect material until the air has exitedthe valves using two waste cups. Close the valveswhen finished.8. Weigh two empty cups and record the weight andmaterial side on the cup for easy access to thisdata.9. Open the ratio sample valves at the same time andcollect all of the material being pumped out for atleast two full pump cycles using the cups weighed inthe previous step.NOTE: The larger the sample taken, the more accuratethe sample will be.10. Close both of the ratio sample valves at the sametime once the sample has been collected.11. Weigh both cups and subtract out their originalweight. This remainder is the weight of material thathas been dispensed.12. Substitute the weights into the following formula toget the ratio in the form of A:B.A:B(Calculated Ratio = B Weight):1A Weight13. Adjust “percent of stroke” on the “Preset” screen asneeded to achieve the desired ratio.14. Repeat steps 7 through 11 to verify the ratio is correct.332312A 37