About How to convert a screw compressor to remote control
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6 FAQs about [How to convert a screw compressor to remote control]
How do you control a compressor?
Two-position local/remote switch at each compressor, or controller set for “remote” control. Remote start and load, and feedback for standby, running, and alarmed. These can either be with relay dry contacts or with bits on the communications network. Verify that remote load and start work prior to going into full auto.
Does a screw compressor have a VFD?
The OEM delivered a fixed-speed compressor and installed a separate VFD to control it in the field. Most manufacturers of screw compressors now offer new packaged VFD compressors, designed with the drive integrated into the compressor’s controls. Air-end, motor, lubrication, cooling, and speed-range are optimized for VFD operation.
What rpm should a rotary screw compressor run at?
Typically, oil-flooded rotary screw compressors can be run down to 900 rpm at 100 psig, often lower. Oil-free compressors are more sensitive to speed reduction, because of temperature increase with slip at lower speeds.
Do I need a contractor to install a compressor?
Adequate technical support is available. There is an electrical contractor who can act as an integrator, preferably with a controls programmer/engineer on staff, and a compressor engineer available to properly design and commission the system. Some customers have the in-house resources to implement this type of project. Most do not.
How do I integrate a VFD compressor into a multiple compressor system?
To properly integrate a VFD compressor into a multiple compressor system, the VFD compressor must have a “turn-down” (min-max speed flow range) of more than any of the fixed speed compressors in the system. That allows the VFD compressor to operate as the “fixed trim”, or the unit that is always meeting the varying load.
How do you know if a rotary screw compressor is retrofitted?
The retrofitted compressor must have a known speed range. This is easier to determine if the air-end on the unit is packaged in a VFD, gear or belt-drive package that has a known male rotor speed range. Typically, oil-flooded rotary screw compressors can be run down to 900 rpm at 100 psig, often lower.