Mitsubishi Heavy Industries V Multi FDC71VNX Technical Manual page 342

(g) Over-current protection current safe controls I, II
Detecting the outdoor inverter input (primary) current and the output (secondary) current, if the current values exceed
setting values, the compressor speed (frequency) is controlled to protect the inverter.
Retention
Reset
B
Current (A)
(h) Power transistor temperature protection (model FDC250 only)
(i) Protective control
If the power transistor temperature (detected with TIP) exceeds the setting value, the compressor speed (frequency) is
controlled to suppress the rise of power transistor temperature.
Reset
115
Power transistor temperature (°C)
(ii) Anomalous stop control
1) If the power transistor temperature increases further, the protective switch in the power transistor trips and stops the
compressor to protect the power transistor.
2) It enters the anomalous stop mode depending on one of the following conditions.
a) When the protective switch in the power transistor trips and stops the compressor 5 times within 60 minutes
(Displays E41.)
b) When the protective switch in the power transistor trips and the state continues for 15 minutes, including the stop
of compressor (Displays E51.)
(iii) Anomalous inverter PCB
1) If the power transistor detects anomaly 5 times within 60 minutes with compressor stop, E41 is displayed on the
remote control and it enters the anomalous stop mode.
2) If the power transistor detects any anomaly for 15 minutes, including the stop of compressor, E51 is displayed on
the remote control and it enters the anomalous stop mode.
(i) Anomalous power transistor current
(i) Prevents over-current on the inverter. If the current value in the power transistor exceeds the setting value, the compressor
stops.
(ii) If the current value in the power transistor exceeds the specified value and the compressor stops 4 times within 30
minutes, E42 is displayed on the remote control and it enters the anomalous stop mode.
(j) Anomalous inverter communication
If the power transistor detects anomalies 4 times within 15 minutes, including the stop of compressor, E45 is displayed
on the remote control and it enters the anomalous stop mode.
(k) Anti-frost control by the compressor frequency control
(i) If the indoor heat exchanger temperature (detected with Thi-R) exceeds the setting value at 4 minutes after the start of
compressor, the compressor speed (frequency) is controlled to initiate the anti-frost control of indoor heat exchanger.
(ii) When there are 3 indoor heat exchanger temperatures (Thi-R), the lowest temperature is detected.
Reduces compressor frequency
at each minute.
Indoor heat exchanger temperature (°C)
(iii) Regarding the anti-frost control by the operation stop, refer to the operation control function by the indoor control and
the cooling, dehumidifying frost prevention of page 107.
Reduces frequency
at each minute.
A
Reduces compressor frequency
at each minute.
Retention
135
Retention
1.5 3.5
341
-
Model
Control
value A
Primary FDC200 16.0
current
side FDC250 18.0
Secandary FDC200 15.5
current
side FDC250 17.0
Note (1) Value in ( ) are for the single phase
100-140 models.
Reset
-
'19 • PAC-T-327
Cooling Heating
Reset Control
value B value A value B
15.0 16.0
17.0 18.0
14.5 15.5
16.0 17.0
Reset
15.0
17.0
14.5
16.0