Mitsubishi Heavy Industries FDTC40ZHXV Technical Manual page 182

7) Over-current protection current safe controls I, II
Detecting the outdoor unit 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.
8) Power transistor temperature protection
a) 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.
b) Anomalous stop control (model 200, 250 only)
i) If the power transistor temperature rises further, the protective switch in the power transistor operates to protect
the compressor and the power transistor.
ii) Under any of the following condition, E41 is displayed and it enters the anomalous stop mode.
When the protective switch in the power transistor operates 5 times within 60 minutes and the compressor stops.
9) Power transistor temperature control (Single phase models 100~140 only)
This control monitors the power transistor temperature from the start of compressor operation and, when the following
condition is established, controls the compressor speed.
10) Anomalous power transistor current
a) Prevents over-current on the inverter. If the current value in the power transistor exceeds the setting value, the
compressor stops.
b) 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 controller and it enters the anomalous stop mode.
11) Anomalous inverter PCB
If the power transistor detects any anomaly for 15 minutes, including the stop of compressor, E51 is displayed on the
remote controller and it enters the anomalous stop mode.
12) Anit-frost control by the compressor frequency control
a) If the indoor unit heat exchanger temperature (detected with Th
start of compressor, the compressor speed (frequency) is controlled to initiate the
heat exchanger.
b) When there are 3 indoor unit heat exchanger temperatures (Th
c) Regarding the anit-frost
controller and the cooling, dehumidifying frost prevention of page 157.
control by the operation stop, refer to the operation control function by the indoor unit
175
– –
Cooling
Model
Control Reset value
value A
71 15.0
100 13.5 (23.0) 12.5 (22.0) 13.5 (23.0) 12.5 (22.0)
Primary
125,
current 13.5 (23.0) 12.5 (22.0) 13.5 (23.0) 12.5 (22.0)
140
side
200 17.0
250 20.0
71 13.0
100 13.0 (Fig.C) 12.0 (Fig.C) 13.0 (Fig.C) 12.0 (Fig.C)
Secandary
125,
current 13.0 (Fig.C) 12.0 (Fig.C) 13.0 (Fig.C) 12.0 (Fig.C)
140
side
200
250
Note (1) Figures in ( ) are for single phase models.
-R) exceeds the setting value at 4 minutes after the
I
anit-frost
-R), the lowest temperature is detected.
I
Heating
Control Reset value
B value A B
14.0 16.0 15.0
16.0 17.0 16.0
19.0 20.0 19.0
12.0 13.0 12.0
Not implemented
control of indoor unit