Advertisement
button .The air compressor starts by pressing start button after self-test finished. The course of
compressor's start as followed: KM3 and KM2 are energized → Y-type status of start → delay time is
energized → motor operates with △ type to finish start. During the course of starting, all
reached (Y-△change-over time); KM3 is de-energized (KM1 and KM3 are interlocked) and KM1 is
②. Automatic operation control:
electromagnetism valves are de-energized to achieve no load start.
When the motor is started to running in △ status and load the magnetic valve
with power applied after a certain period of delay.
pressure inside gas tank begins to increase. When increased air pressure is more than higher
pressures limit (value of unload pressure), electromagnetism valve for loading is de-energized
and electromagnetism valve for discharging is energized, meanwhile, the air compressor
operates without load. If air pressure decreases to set lower pressure limits (value of load
pressure), the electromagnetism valve for loading is energized again and electromagnetism
valve for discharging is de-energized. Air compressor operates normally to increase pressure
in air tank. If the unload run time exceeds the set delay time of non-load, the compressor will
automatically stop motor's operation to achieve automatic shutdown after works without load
for long time. Only when pressure decreases to lower pressure limits, the motor start
③. Manual loading/unloading under automatic status
operation according to course of starting, then circularly repeat this step.
When compressor in automatically runs state and runs at unload operation, press down
load or unloading button, the electromagnetism valve for loading joggles a little and comes
back to unloading status; if the pressure is less than relief pressure, the electromagnetism
valve for loading is energized and it returns to unloading status until gas supply pressure
becomes larger than relief pressure and device is at loading status. Unloading is performed
when press down unloading button "S". If the pressure is higher than loading pressure, the
electromagnetism valve for loading is de-energized and turns to status of loading until gas
supply pressure is less than loading pressure. If pressure is less than loading pressure, the
④. Normal shutdown:
unloading button do not function.
Press the button , the load magnetic valve will loss power and the unload magnetic will be
applied with power, after a while of delay (stop delay), the motor contactor will loss power,
the host and fan will stop running, after the restarting delay completed, the unload magnetic
⑤. Control of preventing frequent starting
will loss power. Only pressing the button could restart the motor.
Press stop button to stop operation; Air compressor can not be started up immediately
after shutdown due to operation without load for long time or failure shutdowns, and it can be
started up again when remaining delay time is zero which the time display window of the
controller in a variety of shutdown state shows.
2. Remote automatic control
Remote automatic control and local automatic control are basically same, but the difference is
that starting up or stopping of devices can be achieved by means of control of remote switch.
3. Local manual control
Control of starting and stopping are same as automatic control, but device is in status of
Air compressor is loaded and
Advertisement
