Five. Power Frequency Air Compressor Control Principle - DENAIR DA-30A Installation, Maintenance And Operation Manual

is imitated ground (ground); 43 and 44 is of 220V power。
Note： ： ： ： While wiring, magnet coil needs connecting glitch absorption
Five． ． ． ． Power Frequency Control Principle
A. Individual control
a. On-site automatic control (on-off mode: machine side; loading mode: automatic)
a) Press "I" key to start： （Y— s
The controller has 3 seconds self examination after powering on and can't start up by pressing "I"key. After self
examination, press the "I"key to start the main engine. The processes of the main engine starting are as follows:
KM3 and KM2 get electricity
losses electricity( KM1 and KM3 lock each other) and KM1 gets electricity
status and starting ends. During the starting process, all the electromagnetic valves loss electricity all the time and
realize the deadhead starting.
b). Automatic operation control：
After the motor starting to be the △ status and delaying a certain time, charge the electromagnetic valves to get
electricity, and the air compressor begins to load while the gas tank pressure gets to rise. If in a set time (within
deadhead time), the air pressure lower again than that of the setting lower-limit pressure (loading pressure value),
loading the electromagnetic valve to get electricity and unloading the electromagnetic to loss the electricity, so the
compressor compresses air normally and increases the gas tank pressure. The gas tank pressure hasn't be
reduced to the lower-limit pressure if during the deadhead time, so the controller will automatically stop the motor
work to realize the deadhead automatic stop. Only if the pressure reduces to the lower limit pressure, the motor will
automatically operates according to its starting process, then reciprocating and cycling in this way.
c). Manually uploading or unloading at the automatic status.
At the automatic status, the equipment is unloading, so press the key "↓↑"to load. If the pressure higher that the
unloading pressure, load the electromagnetic valve and jog for one time to return to the unloading status; If the
pressure lower than the unloading pressure, load the electromagnetic valve to get electricity until the air supplying
pressure bigger than the unloading pressure and return to the unloading status. When the equipment is at the
loading status, press the key"↓↑"to do unloading, if the pressure higher than the loading pressure, load the
electromagnetic valve to loss electricity until the air supplying pressure lower than the loading pressure and return to
the loading status; if the pressure lower than the loading pressure, unloading doesn't work at this moment.
d). normal breakdown
When press the key " O " ,
electromagnetic valve gets electricity. After delaying for some time, the motor contactor loses electricity and motors
of the main engine and fan stop works, and after restarting and delaying, the unloading electromagnetic valve loses
electricity. Restart only by pressing the key "I".
e). control again frequent starting
Shutting down by pressing the key "O" , overlong deadhead stopping and breakdown will make the motor stop
working, during which time, we shouldn't start the motor immediately and need to delay it for some time. At every
stopping status, the time display window countdown of the controller shows that the rest delay time for example,
90 seconds), and only when the delay time is zero, the motor can be started up.
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△ ）
Type Y starting status
the loading electromagnetic valve loses electricity while the unloading
delay the time to Y—△ Transferring time, the KM3
the motor operates at the
△
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