8 Electrical checks of the main parts
Inverter
SMGB0091 rev.2 - 11/2015
134
6
Earth detection
a. Level of detection
. When the starting current of the compressor reaches 80% of the overcurrent protection value,
an abnormality is detected.
b. Function
. When abnormalities are detected, the inverter compressor is stopped and the signal code of stoppage
cause is transmitted to PCB1.
c. Cancellation of protection function
. Transmission for signal code of stoppage cause is cancelled when a
stopping order is issued or main power source is cut off.
8.1.4
Overload control
1 Level of detection
. When the output current exceeds 105% of the maximum output current, an abnormality is
detected.
2 Function
. An overload signal is issued 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
operation is performed with the compressor frequency limited to the upper level frequency when the output current
decreases lower than 88% of the rated one. However, if the frequency order is smaller than the maximum value, the
operation is performed according to the order.
3 Cancellation of protection function
. After the operation described in the above item 2 is performed for 10 seconds,
this control is cancelled.