Reducing Frequency At High Speed And Power Turn-Off; Protective Function For Electric Current; Voltage Sag Protection; Communication Fault - ComfortStar CARAT18-CD Service Manual

5. Reducing frequency at high speed and power turn-off:

If T
frequency reducing temperature at high speed during discharging
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 during discharging
6. Power turn-off:
If the T
Power turn-off temperature during discharging
T
Discharge Limited frequency temperature during discharging
should be allowed to operate.
7. If the discharging temperature protection of compressor 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
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).

(4) Protective function for Electric current

1. Raising the frequency slowly:
During the process of raising electric current and frequency, if the
I
Electric current Limited frequency when overcurrent
Preventing protection frequency raising speed
slowly raising control.
2. Frequency limited
If I
Limited frequency when overcurrent
raising of compressor.
3. Reducing frequency:
If I
Frequency reducing when overcurrent
frequency till the lower limit or exit the frequency reducing condition;
4. Power turn-off:
If I
Power turn-off machine when overcurrent
T
AC Electric current Limited frequency when overcurrent
should be allowed to operate.
5. 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 overcurrent

(5) Voltage sag protection

After start the compressor, if the time of DC link Voltage sag U
t
Voltage sag protection time
automatically after 30 minutes.

(6) 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.
(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
, the module protection is cleared to recount.
module
(8) Module overheating protection
1. Starting estimation:
After the compressor stopped working for 180s, if T
hysteresis is 2 ), 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. Raising the frequency slowly:
During the process of raising frequency, if the
, the frequency raising speed should be executed according to the
temperature of module
; If T T
speed Module Slowly raising frequency temperature of module
≤T
Discharge
and the compressor has been stopped for 3 minutes, the machine
t
Protection times clearing of discharge
, the frequency raising speed should be executed according to the
; If I
AC Electric current
≤I
AC Electric current
≤I
AC Electric current
≤I
AC Electric current
and the compressor has been stopped for 3 minutes, the machine
, the discharge protection is cleared to recount.
, the machine should be stop at once, hand on the voltage sag trouble, reboot
T
≤T T
Discharge Stop temperature during discharging
≤T , you should discharge to protect machine stopping;
Discharge
, you should discharge to protect machine stopping; If T
, the discharge protection is cleared to
I
Electric current of overcurrent slowly raising frequency
I
Electric current of overcurrent slowly raising frequency
I
frequency reducing when overcurrent
I
Power turn-off when overcurrent
, you should carry out the overcurrent stopping protection; If I
Sagging protection voltage
T
Module Module frequency limited temperature
Slowly raising frequency temperature of module
, you should exit the slowly raising control.
you should adjust
, you should exit the
, you should limit the frequency
, you should reduce the compressor
is measured to be less than
t
Protection times clearing of
(the temperature of
≤T T
Module
F
Preventing protection frequency raising
≤I
AC
F
Limited frequency