OPERATION & MAINTENANCE
4.3
4. Turn the MAN/AUTO switch to the AUTO (automatic) position.
5. If the pelletizer has two cylinders, place the A/B/A&B switch to the desired se-
lection, either A or B for single cylinder operation, or A&B for dual cylinder op-
eration.
6. Push the START button to begin operation.
7. Periodically monitor the compression cylinder pressure by observing the gauge(s)
at the front of the extruder. The compression cylinder pressure should be ap-
proximately 35 - 40 psig (2.4 - 2.8 bar) during the injection cycle. If the pressure
is outside of this range, see Section 5 - TROUBLE- SHOOTING.
Note: High Capacity machines have a five-cycle start procedure to facilitate starting
the machine. After a plug has formed, both injection valves will open at the be-
ginning of the injection cycle. The valves should be adjusted so the pressure is
30-35 psi (2-2.4 bar) at the beginning of the injection cycle. The pressure should
slowly climb to 40 psi (2.8 bar), which will cause the lower valve to close. The
pressure in the chamber should drop to around 20 psi (1.3 bar) and should peak
at about 40 psi (2.8 bar) at the end of the cycle.
8. Periodically monitor the hydraulic pressure by observing the gauge at the hydrau-
lic valve manifold. The hydraulic pressure should spike at the relief setting as
dry ice begins to exit the extrusion die. See Table 1.2 on page 1.7 for the hydrau-
lic pressure relief setting of each model. If the hydraulic pressure sustains the re-
lief setting pressure for more than 5 seconds, see Section 5 - TROUBLESHOOT-
ING.
WARNING
WARNING: IF THE METERING VALVE IS SET TOO
HIGH, THE INJECTION VALVE WILL CYCLE ON AND
OFF. PROLONGED CYCLING WILL SIGNIFICANTLY
REDUCE THE LIFE OF THE VALVE.
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