drive mode manually, please perform the switching in stop status of the
screw compressor. Otherwise, short circuit may occur to electric arc at
the output side of the inverter.
If you operate the main motor’s inverter/power-line switch (X1) when
screw compressor runs, the controller will make the screw compressor
emergency stop.
If you need to switch the drive mode of the fan, you have to enter user
password in the run status of the screw compressor and then perform
the modification under the ““Parameter setting” > “Configuration
functions” menu.
5.5 Description of Control Process of Screw compressor Controller
5.5.1 Control Process in MDI Drive Mode
In MDI drive mode, the controller detects the outlet pressure of the
screw compressor and performs PID operation based on the preset
outlet pressure so as to control the output frequency of the inverter and
keep the outlet pressure stable at “preset exhaust pressure”. When the
output frequency of inverter is lower than 50Hz, the system efficiency in
MDI mode is higher than that in power-line drive mode.
When the air volume decreases, and the running time at lower limit of
frequency is shorter than the preset “Sleep mode judging time”, the
controller will stop the inverter and make the screw compressor enter
sleep mode (also called stopping mode), so as to achieve further
energy saving and reduce equipment wearing.
The Control process in the MDI drive mode is shown as follows:
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