Gree GWH07AWAXA-K6DNA1C

75
Technical Information
Service Manual
machine in three minutes, the machine will stop for communication
fault. When you have not received any correct signal from driver
IC (aim to the controller for the separating of main control IC and
driver IC), and the machine will stop for communication fault. If the
communication is resumed, the machine will be allowed to operate.
(7) Module protection
Testing the module protective signal immediately after started,
once the module protective signal is measured, stop the machine
with module protection immediately. If the module protection is
resumed, the machine will be allowed to operate. If the module
protection continuously occurs for three times, it should not be
resumed automatically, and you should press the ON/OFF button
to resume. If the running time of compressor exceeds the [t
Protection
times clearing of module
] , the module protection is cleared to recount.
(9) Module overheating protection
1. Starting estimation:
After the compressor stopped working for 180s, if T
Module
<[T
Module
frequency limited temperature
], the machine is allowed to start, otherwise it
should not be started, and should be stopped to treat according
to the module overheating protection: The machine should be
stopped or transferred to supply air, the trouble should be cleared
immediately, and the protection times are not counted.
2. Frequency limited
If [T
Limited frequency temperature of module
] ≤T
Module
<[T
frequency reducing temperature at normal
speed of module
] , you should limit the frequency raising of compressor.
3. Reducing frequency at normal speed and power turn-off:
If [T
frequency reducing temperature at normal speed of module
] ≤T
Module
<[T
frequency reducing
temperature at high speed of module
], you should adjust the compressor
frequency by reducing 8Hz/90s till the lower limit; After it was
running 90s at the lower limit, if [T
frequency reducing temperature at normal speed of
module
] ≤T
Module
, you should stop the machine for module overheating
protection;
4. Reducing frequency at high speed and power turn-off:
If [T
frequency reducing temperature at high speed of module
]≤T
Module
<[T
Power turn-off temperature
of module
] you should adjust the compressor frequency by reducing
30Hz/90s till the lower limit; After it was running 90s at the lower
limit, if [T
frequency reducing temperature at normal speed of module
] ≤T
Module
, you should
stop the machine for module overheating protection;
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 TModule <[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 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 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) 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 Turn-Off 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 Turn-Off 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.
(11) 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.
(12) 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 out-of-
step 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.
(13) Voltage Abnormity Protection for DC Bus
To detect voltage abnormity protection for dc bus after completing
the pre-charge:
1. Over-Low Voltage Protection for DC Bus:
When the compressor is running, the DC bus voltage is detected.
If the PFC is not opened, the bus voltage is smaller than the
VPFC does not open the undervoltage protection valuetime, if the
PFC is turned on, the bus voltage is smaller than the VPFC Open
undervoltage protection value Times Under voltage protection,
under pressure protection, the compressor is closed, and the
PFC is closed, and the compressor will clear the fault sign after 3