Installation and Maintenance
Service Manual
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
temperatur e 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
24
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:
1. Over-High Voltage Protection for DC Bus:
If it found the DCbus voltage U
DC
>[UDC
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
<[UDC
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
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