York EVJC 12, Installation Instructions Manual

Page: 153 / 204

225
5. Reducing frequency at high speed and power turn-off:
If
Ǐ
T
frequency reducing temperature at high speed during discharging
ǐ
≤
T
Discharge
˘Ǐ
T
Stop temperature during discharging
ǐ
you should adjust
the compressor frequency by reducing 30Hz/90s till the lower limit; After it was running 90s at the lower limit, if
Ǐ
T
frequency reducing temperature at normal speed during discharging
ǐ
≤
T
Discharge
, you should discharge to protect machine stopping;
6. Power turn-off:
If the
Ǐ
T
Power turn-off temperature during discharging
ǐ
≤
T
Discharge
, you should discharge to protect machine stopping; If T
Discharge
˘ Ǐ
T
Limited frequency temperature during discharging
ǐ
and the compressor has been stopped for 3 minutes, the machine
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
Ǐ
t
Protection times clearing of discharge
ǐ
, 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).
(4) Protective function for Electric current
1. Raising the frequency slowly:
During the process of raising electric current and frequency, if the
Ǐ
I
Electric current of overcurrent slowly raising frequency
ǐ
≤
I
AC
Electric current
˘Ǐ
I
Limited frequency when overcurrent
ǐ
, the frequency raising speed should be executed according to the
Ǐ
F
Preventing protection frequency raising speed
ǐ
; If I
AC Electric current
˘ Ǐ
I
Electric current of overcurrent slowly raising frequency
ǐ
, you should exit the
slowly raising control.
2. Frequency limited
If
Ǐ
I
Limited frequency when overcurrent
ǐ
≤
I
AC Electric current
˘Ǐ
I
frequency reducing when overcurrent
ǐ
, you should limit the frequency
raising of compressor.
3. Reducing frequency:
If
Ǐ
I
Frequency reducing when overcurrent
ǐ
≤
I
AC Electric current
˘ Ǐ
I
Power turn-off when overcurrent
ǐ
, you should reduce the compressor
frequency till the lower limit or exit the frequency reducing condition;
4. Power turn-off:
If
Ǐ
I
Power turn-off machine when overcurrent
ǐ
≤
I
AC Electric current
, you should carry out the overcurrent stopping protection; If I
AC Electric current
˘Ǐ
T
Limited frequency when overcurrent
ǐ
and the compressor has been stopped for 3 minutes, the machine
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
Ǐ
t
Protection times clearing of overcurrent
ǐ
, the discharge protection is cleared to recount.
(5) Voltage sag protection
After start the compressor, if the time of DC link Voltage sag
Ǐ
U
Sagging protection voltage
ǐ
is measured to be less than
Ǐ
t
Voltage sag protection time
ǐ
, the machine should be stop at once, hand on the voltage sag trouble, reboot
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
Ǐ
t
Protection times clearing of
module
ǐ
, the module protection is cleared to recount.
(8) Module overheating protection
1. Starting estimation:
After the compressor stopped working for 180s, if T
Module
˘Ǐ
T
Module frequency limited temperature
ǐ
(the temperature of
hysteresis is 2 ), the machine is allowed to start, otherwise it should not be started, and
ć
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
Ǐ
T
Slowly raising frequency temperature of module
ǐ
≤
T
Module
˘Ǐ
T
Limited frequency
temperature of module
ǐ
, the frequency raising speed should be executed according to the
Ǐ
F
Preventing protection frequency raising
speed
ǐ
; If T
Module
˘Ǐ
T
Slowly raising frequency temperature of module
ǐ
, you should exit the slowly raising control.
Operation
34