44
Technical Information
Service Manual
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 discharge
, 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).
7. Frequency limited
If [I
Limited frequency when overcurrent
] ≤I
AC Electric current
<[I
frequency reducing when
overcurrent
], you should limit the frequency raising of compressor.
8. Reducing frequency:
If [I
Frequency reducing when overcurrent
] ≤[I
AC Electric current I Power turn-off when
overcurrent
] , you should reduce the compressor frequency till the
lower limit or exit the frequency reducing condition;
9. Power turn-off:
If [I
Power turn-off machine when overcurrent
] ≤[I
AC Electric current
] , you should carry
out the overcurrent stopping protection; If I
AC Electric current
<[T
Limited
frequency when overcurrent
] and the compressor has been stopped for 3
minutes, the machine should be allowed to operate.
10. If the overcurrent 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 over current
]
, the discharge protection is cleared to recount.
(6) Voltage sag protection
After start the compressor, if the time of DC link Voltage sag [U
Sagging
protection voltage
] is measured to be less than t Voltage sag protection
time , the machine should be stop at once, hand on the voltage
sag trouble, reboot automatically after 30 minutes.
(7) Communication fault
When you have not received any correct signal from the inner
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.
(8) 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 temperature of hysteresis is 35.6ºF ), 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 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
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