Screw Compressor Slide valve auto loading mechanics

plcnovel

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Join Date
Feb 2006
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LHR
Posts
215
There are two solenoids to control a screw compressor slid valve; one is for Load and the other one is for Unload. I would like to control the capacity of the screw compressor using these solenoids. When the suction pressure is above the Auto Load Setpoint the Load Relay is energized. The relay is pulsed on/off according to Load On and Load Off timers. The unit will not auto load if the suction pressure is above the Auto Load Disable Setpoint. Any ideas or suggestions how this can be accomplished in RSlogix5000 platform for Compact Logix controllers? Commenst will be appreciated.

Regards
 

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