Mitsubishi Heavy Industries FDT200VSAWPVH Service Manual page 39

(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
(i) Anomalous stop control
If the power transistor temperature exceeds the setting value, the protective switch in the power transistor trips and
stops the compressor to protect the power transistor.
(ii) 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.
3) 3 minutes after the compressor stops, it becomes possible to restart from the remote control.
( 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.
(iii) 3 minutes after the compressor stops, it becomes possible to restart.
( j ) Anomalous inverter communication
(i) When the answerback signal from the inverter cannot be received continuously for 15 seconds, the compressor stops.
(ii) If the power transistor defects 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.
3 minutes after the compressor stops, it becomes possible to restart from the remote control.
(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.
(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 18.
Reduces frequency
at each minute.
A
Compressor operation
115
Reduces compressor frequency
at each minute.
1.5
Indoor heat exchanger temperature (°C)
-
Model
Control
value A
Primary FDC200 16.0
current
side FDC250, 280 17-17.5
Secandary FDC200 15.5
current
side FDC250, 280 17-18.5
Compressor stop
135
Power transistor temperature (°C)
Reset
Retention
3.5
38
-
'21 • PAC-SM-383
Cooling Heating
Reset Control
value B value A value B
15.0 16.0
16-16.5 17-17.5 16-16.5
14.5 15.5
16-17.5 17-18.5 16-17.5
Reset
15.0
14.5