Fedders GWH18MC-D3DNA1A/O, Руководство по обслуживанию, Страница: 27 / 73

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Function and Control
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
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 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)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 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.
(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 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.
(14) Voltage Abnormity Protection for DC Bus
To detect voltage abnormity protection for dc bus after completing the pre-charge: