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5. Power turn-off
If the [T
Power turn-off temperature of module
]≤T
Module
, you should stop the machine for module overheating protection; If T
Module
<
[T
Limited frequency temperature of module
] and the compressor has been stopped for 3 minutes, the machine should be allowed to operate.
6. If protection continu ously 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 [t
Protection times clearing of module
], the discharge protection
is cleared to recount. Stopped or transferred to supply air mode will clear the trouble times immediately (if the trouble can not be
resumed, mode transferring also will not clear it).
(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
[t
Protection times clearing of compressor overloading
]30 minutes.
(11)Phase current overcurrent 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 [I
Limited frequency phase current
]≤I
Phase current
<[T
frequency reducing phase current
], you should limit the frequency raising of compressor.
2. Reducing Frequency
If [I
Frequency Reducing Phase Current
]≤I
Phase Current
<[I
Power 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 I
Phase Current
≥[I
Power TurnOff Phase Current
], the compressor phase current shall stop working for overcurrent protection; if
I
Phase Current
≤[I
Frequency 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
[t
Clearing 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 startingup 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 Startingup 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 outofstep protection signal should be detected immediately after startingup compressor, and once find the out-of-step protection signal,
the outofstep 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.
(14) Voltage Abnormity Protection for DC Bus To detect voltage abnormity protection for dc bus after completing the precharge:
1.Over-High Voltage Protection for DC Bus
If it found the DC bus voltage U
DC
>[U
DC Jiekuangchun Protection
], turn off PFC and stop the compressor at once, and it shall show the DC
over-high voltage failure; it should clear out the failure when the voltage dropped to U
DC
<[U
DC Jiekuangchun Recovery
] and the compressor
stopped for 3 min.
2.Over-Low Voltage Protection for DC Bus
If it found the DC bus voltage U
DC
<[U
DC Wantuochun Protection
], turn off PFC and stop the compressor at once, and it shall show the DC
over-low voltage; and it should clear out the failure when the voltage raised to U
DC
>[U
DC Wantuochun Recovery
] and the compressor stopped
for 3 min.
3.To detect voltage abnormity protect for DC bus when getting electricity
If it found the DC bus voltage U
DC
>[U
DC——Over-High Voltage
], turn off the relay at once, and shows voltage abnormity failure for DC Bus. And
the failure can’t recover except to break off and get the electricity.
(15)Abnormity Protection for Four-way Valve
Under the model of heating operation in good condition: the compressor is detected T
Inner Tube
<(T
Inner Ring
-
[T
Abnormity Temperature Difference For Four-Way Valve Reversion
]), during the running, it should be regarded as four-way valve reversion abnormity. And
then it can run if stop the reversion abnormity protection for four-way valve 3 min; and if it still can’t run when the reversion abnormity
protection for four-way valve happens to stop working for 3 times in succession, it is available if presses ON/OFF.
Attention: the protection shall be shielded during the testing mode and defrosting process, and it shall be cleared out the failure and its
times immediately when turning off or delivering wind / cooling / dehumidifying mode conversed (the inverted mode don’t clear out the
failure when it can’t recover to operate).
