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Main Parts
(6) Earth Detection
(a) Level of Detection
①
When the terminal U, V, W and earth of the compressor are short-circuited before compressor activation,
abnormalities are detected.
②
When the output terminals (U, V, W) of transistor module (PIM) are short-circuited, abnormalities are detected.
(b) Function
When abnormalities are detected, the inverter compressor is stopped and the signal code of stoppage cause is
transmitted to outdoor unit PCB.
(c) Cancellation of Protection Function
Transmission signal about stoppage cause is canceled when remote control switch is o or main power supply is cut
o.
3.1.3 Overload Protection Control
(a) Level of Detection
When the output current exceeds 105% of the maximum output current, an abnormality is detected.
(b) Function
An overload signal is transmitted to the outdoor unit PCB when output current exceeds 105% of the maximum output
current, and the frequency decreases.
For 10 seconds after the output current decreases lower than 88% of the rated current, the compressor maximum
frequency is limited to the specied value.
However, if the frequency order is smaller than the maximum value, the operation is performed according to the
order.
(c) Cancellation of Protection Function
After the operation described in the above item (b) is performed for 10 seconds, this control is canceled.
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