General Information
Compressor Load Balancing Duplex chillers with CH530 control will balance the compressor load by giving each compressor the same load command. The load command will be converted to IGV position that will be the same on each compressor.
Balancing compressor load results in the best overall efficiency and with both circuits operating with nearly the same refrigerant pressures.
When both compressors are running the overall chiller load command will be split evenly between the two compressors unless limit control overrides balancing. When transitioning between one compressor operation and two- compressor operation, the load commands will be actively balanced at a rate slow enough to minimize capacity control disturbances
Restart Inhibit
The purpose of restart inhibit feature is to provide short cycling protection for the motor and starter.
The operation of the restart inhibit function is dependent upon two setpoints. The Restart Inhibit Free Starts
Restart Inhibit Free Starts
This setting will allow a number of rapid restarts equal to its value. If the number of free starts is set to “1”, this will allow only one start within the time period set by the Start to Start Time Setting. The next start will be allowed only after the start to start timer has expired. If the number of free starts is programmed to “3”, the control will allow three starts in rapid succession, but thereafter, it would hold off on a compressor start until the Start to Start timer expired.
Restart Inhibit Start to Start Time Setting
This setting defines the shortest chiller cycle period possible after the free starts have been used. If the number of free starts is programmed to “1”, and the Start to Start Time Setting is programmed to 20 minutes, then the compressor will be allowed one start every 20 minutes. The
Clear Restart Inhibit
A Clear Restart Inhibit “button” is provided within Settings; Manual Override on the DynaView display. This provides a way for an operator to allow a compressor start when there is a currently active Restart Inhibit that is prohibiting such a start. The “button” press will have no other function than to remove the restart inhibit if there is one active. It does not change the count of any internal restart inhibit timers or accumulators.
The restart inhibit function, setpoints and clear features exist for each compressor and operate independently of other compressors on that chiller.
During the time the start is inhibited due to the
A “Restart Inhibit Invoked” warning diagnostic will exist when the attempted restart of a compressor is inhibited.
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