Compressor Overloads Protection; Phase Current Over Current Protection Of Compressor; Starting-Up Failure Protection For Compressor; Out-Of-Step Protection For Compressor - Gree Neo GWH09MA-A3DNA3A Installation, Service & Troubleshooting

Basic Functions - 18K & 24K 230 volt

(10)Compressor overloads protection

If you measure the compressor overload switch action in 3s, the compressor should be stopped for overloading. The
machine should be allowed to operate after overload protection was measured to resume.
If the overloading protection continuously occurs for three times, it should not be resumed automatically, and
you should press the ON/OFF button to resume. The protection times of compressor is allowed to clear after the
compressor run
[tProtection times clearing of compressor overloading]30 minutes.

(11)Phase current over current protection of compressor

During the running process of compressor, you could measure the phase current of the compressor, and control it
according to the following steps:
1. Frequency limited
If [ILimited frequency phase current]≤IPhase current<[Tfrequency reducing phase current], you should limit the
frequency raising of compressor.
2. Reducing Frequency
If [IFrequency Reducing Phase Current]≤IPhase Current<[IPower TurnOff Phase Current], the compressor shall
continue to reduce frequency till the lowest frequency limit or out of the condition of reducing frequency;
3. Power turn-off If IPhase Current≥[IPower TurnOff Phase Current], the compressor phase current shall stop
working for overcurrent protection; if
IPhase Current≤[IFrequency Reducing Phase Current], and the compressor have stopped working for 3 min, the
machine shall be allowed to operate;
4. If the overcurrent protection of compressor phase current continuously occurs for six times, it should not be
resumed automatically, and you should press the ON/OFF button to resume. During the process of running, if the
running time of compressor exceeds the [tClearing Time of Compressor Phase Current Times], the overcurrent
protection is cleared to recount.

(12)Starting-up Failure Protection for Compressor

Stop the compressor after its starting up fails, restart it after 20s if the fault doesn't shows, and if they are all failing for
the successive start
3 times, it shall be reported as Starting up Failure, and then restart up it after 3 min. When it still not be able to
operate through carry out
the above process for 5 times, it is available if press ON/OFF. And the compressor should be cleared the times after it
run 2 min.

(13) Out-of-Step Protection for Compressor

The out of step protection signal should be detected immediately after starting up compressor, and once find the out-
of-step protection signal,
the out of step protection shall be stopped; if it can run for lasting power turn off 3 min, the machine shall be allowed
to operate. If it still
can't run automatically when the turn-off-times protection for compressor happens to stop working for 6 times in
succession, it needs to
press ON/OFF to operate. And if the running time is more than 10 min, the power turn-off-times for out of step
protection shall be cleared
and recounted.
Product Introduction
45