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A scrap yard had a metal compactor that is fed by a large metal shredding machine driven by a 1500 HP electric motor.  The compactor had a 3-bank series manifold with DO5 directional valves incorporating A & B meter-out flow controls.  Circuit reliefs were used on all the A & B lines to protect the vane pumps and reduce energy consumption.  Only one circuit at a time would be engaged during operation and each function would operate at a different pressure.  The PLC program was checked and verified that all the interlocks would only let one function operate at a time.  The lowest relief valve was set at 600 psi while the highest relieved...

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