ELGi EG 11, Operation And Maintenance Manual

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What is the significance of AO scale setting in the controller?
The AO scaling is referring to 1V corresponds to min speed and 5V corresponds to max speed, based on this scaling range
and Analogue input reference VFD calculates the required speed/frequency at which the compressor motor need to run. The
AO scaling values in the controller settings and in the drive parameter 614,615 need to be same.
What is the significance of Max speed and min speed settings in the controller?
This gives limitation on Max/Min speed for selected compressor model and this limitation will change between compressor
models. This setting must not exceed the AO scaling range.
What is the significance of optimum speed setting in the controller?
If the compressor needs to operate in fixed speed the optimum speed to be enabled in the operator setting, In the case of
optimum speed enabled the compressor will run at optimum speed during load and run at unload speed during unload. This
facility is available to give the flexibility to the customer if the compressed air circuit have more than one VFD machine and
one machine is enough for speed control.
The optimum speed setting to be done in between the range of min and max speed setting
What is the significance of unload speed setting in the controller?
The unload speed is nothing but what speed the compressor has to run during unload. This setting to be in the range of min
and max speed and less than optimum speed.