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171
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(h) Inverter protection control
1) Current cut control
This prevents overcurrent at the inverter. If the current exceeds the set value, the compressor is stopped. It restarts automati-
cally 3 minutes later, but if the current is cut 3 times within a period of 20 minutes, an anomalous stop (E42) occurs.
2) Power transistor overheating protection
If the power transistor temperature rises to 82°C or higher, the compressor speed is reduced. If the temperature drops to
77°C or lower, this control is cancelled.
3) Excessive voltage protection control
If the converter voltage exceeds approximately 340V, compressor is stopped. If this anomalous operation is repeated 3
times within a period od 20 minutes or continues 15 minutes continuously, an anomalous stop (E47) occurs.
(i)
Temperature thermistor disconnection (discharge pipe, outdoor heat exchanger and ambient air tempera-
ture thermistor)
1) Outdoor heat exchanger temperature, ambient air temperature thermistor
If the outdoor heat exchanger temperature thermistor or the ambient air temperature thermiator detects -30°C or lower
continuously for 5 seconds during the period from 2 minutes to 2 minutes 20 seconds after the compressor starts, the
compressor is stopped. The compressor is restarted after 3 minutes delay, but if this condition is detected 3 times within
the period of 40 minutes, an anomalous stop (E37 or E38) occurs.
Note (1) The temperature is not detected during defrosting or for 3 minutes after defrosting is ended.
2) Discharge pipe temperature thermistor
If the discharge pipe temperature thermistor detects -10°C or lower continuously for 5 seconds during the period from
10 minutes to 10 minutes 20 seconds after the compressor starts, the compressor is stopped. The compressor is restarted
after 3 minutes delay, but if this condition is detected 3 times within the period of 40 minutes, an anomalous stop (E39)
occurs.
Note (1) The temperature is not detected during defrosting or for 3 minutes after defrosting is ended.
3) Power transistor temperature thermistor
If the power transistor temperature thermistor detects -10°C or lower continuously for 5 seconds during the period from 10
minutes to 10 minutes 20 seconds after the compressor starts, the compressor is stopped. The compressor is restarted after
3 minutes delay, but if this condition is detected 3 times within the period of 40 minutes, an anomalous stop occurs.
(j)
Silent mode control
If the “Silent Mode Start” signal is received from the remote controller, silent mode operation is started.
• All the required rotations above 100 rps will be set to 100 rps.
(k) Anomalous stop due to starting of the compressor
(a) If the compressor DC motor rotor position detection cannot be executed 5 seconds after compressor starts, compressor
stops temporarily. Then 3 minutes later the compressor is restarted to detect rotor position again.
(b) If the position detection cannot be executed the second time, an anomalous stop (E59) occurs.
(l)
Compressor rotor lock trouble
If the rotor position cannot be detected after it has been detected once, compressor is stopped. 3 minutes later the compressor
is restarted, but if this condition is repeated 4 times within the period of 15 minutes, an anomalous stop (E60) occurs.
(m) Insuffi cient refrigerant protection control
One minute (for cooling and dehumidifying mode) or 9 minutes (for heating mode) after the compressor is started, if the
temperature difference between the indoor heat exchanger temperature (Thi-R) and indoor air inlet temperature (Thi-A)
becomes following conditions, the compressor speed is kept 30 rps for 1 minute and is stopped.
1) If the following conditions continue uninterrupted for 1 minute or longer
• Cooling and dehumidifying mode: (Thi-R) is 4deg or higher than (Thi-A).
• Heating mode: (Thi-R) is 4deg or lower than (Thi-A).
2) If this condition is repeated 3 times within the period of 30 minutes, an anomalous stop (E57) occurs.
