Figure 5-1 Control process in the MDI drive mode
After the MDI drives the main motor to run for 2 seconds, the controller
opens the open the intake valve and adjusts the air outlet pressure
through the PID operation.
In normal running status, once you press the “Stop” command key, the
controller will immediately turn off the solenoid valve to shut down the
intake valve and reduce the output frequency of the inverter to lower
limit of frequency, which makes the screw compressor continue to run
for some time at zero load condition (called “Preparation time for
stopping”) so as to let the screw compressor cool off before stopping
the inverter and turning off the fan.
5.5.2 Control Process in the Power-line Drive Mode
In power-line drive mode, the controller detects the outlet pressure of
the screw compressor. Then it turns on or turns off the intake valve
based on the preset “Loading pressure” and “Unloading pressure” so as
to keep outlet pressure stable between the “Loading pressure” and
“Unloading pressure”.
When the air volume decreases, and the operating time at the
unloading status is shorter than the preset “Sleep mode judging time”,
the controller will stop the main motor and make the screw compressor
enter sleep mode (also called stopping mode), so as to save energy
and reduce equipment wearing.
The Control process in the power-line drive mode is shown as follows:
Figure 5-2 Control process in the MDI drive mode
efesotomasyon.com
To Next Page
Loading...
Need help?
General
