REPAIR & ADJUSTMENTS
4. When the pressure switch shifts at 2900 PSI the cylinder continues to advance at an
18 GPM flow rate and the pressure increases (due to ice compression resistance) to
approx. 3200-3600 PSI. The ice slug moves and extrudes ice through the die until
the end of stroke limit switch (extend) is tripped.
Note: The pressure drops off slightly when the ice slug begins to move.
5. When the cylinder reaches the end of the extend stroke and signals the processor
(end of stroke limit switch), the following happens:
A. Valve #26 shifts to decompression and valve #28 opens to decompress the system
pressure.
B. Valve #20 directional control de-energizes and shifts from extend to the center
position (all ports closed).
C. The cylinder stops its advance travel.
6. Direction control valve #20 energizes and shifts to retract the cylinder. The cylinder
will begin retracting because:
A. Pump #1 shifts to full flow (60 GPM)
B. Pump #2 shifts to full flow (25 GPM)
C. Dump valve #28 closes
D. Valve #26 shifts from decompression to excess flow position.
7. When the cylinder has traveled to a point near the full retracted position it trips a re-
tracted limit switch, and the following happens:
A. Pump #2 shifts to min-volume (18 GPM)
B. Pump #1 shifts to the 450 PSI (unload) setting
C. Valve #28 is energized and dumps partial pump flow to tank
6.7
Summary of Contents for DE89RB- 1000
Page 1: ...CARBON DIOXIDE DRY ICE PELLETIZER OPERATION MAINTENANCE MANUAL ...
Page 2: ...ii ...
Page 4: ...iv ...
Page 6: ...vi ...
Page 7: ...INTRODUCTION SECTION 1 0 1 ...
Page 15: ...CARBON DIOXIDE SAFETY SECTION 2 0 2 ...
Page 18: ......
Page 19: ...INSTALLATION SECTION 3 0 3 ...
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Page 25: ...OPERATION MAINTENANCE SECTION 4 0 4 ...
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Page 49: ...TROUBLE SHOOTING SECTION 5 0 5 ...
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Page 55: ...REPAIR ADJUSTMENTS SECTION 6 0 6 ...
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Page 67: ...APPENDIX SECTION 7 0 7 ...
Page 81: ...NOTES 7 14 APPENDIX ...
Page 82: ...NOTES 7 15 APPENDIX ...
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