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Main Parts
Protection Function
Overcurrent Protection for Inverter
(1) Short-Circuit Trip of Arm
(2) Instantaneous Overcurrent Trip
(3) Instantaneous Overcurrent Trip
When detecting current is more than rated current of Power Integrated Module, overcurrent is
detected.
(4) Electronic Thermal Trip
When the current detected by current sensor exceeds 105% of the rated current continuously
for 30 seconds or for 3 minutes in total during a 10-minute period, overcurrent is detected.
Protection of Power
Integrated Module (PIM)
Power Integrated module (PIM) has four protection functions for self-protection.
(1) Some of the output terminals between “U” and “V”, “V” and “W”, “W” and “U” have a short-
circuit.
(2) Running current reaches the maximum rated current.
(3) Abnormal temperature is measured by internal thermistor.
(4) Control voltage decreases abnormally.
Overload Control
Overload control at a current greater than (Rated Current x 105%).
Overload control release at a current smaller than (Rated Current x 88%).
CaseTemperature Increase The unit is stopped when the PIM Tc temperature is higher than 212°F(100
℃
).
Earth Detection The unit is stopped when the compressor is earthing.
10ms
Current
50ms 30s Time
(1)
(2)
(3)
Rated Current of Power
Integrated Module (PIM)
Rated Current ×105%
(4)
3.1.2 Arrangement of Inverter Power Unit
No. Parts Name
1 Radiation Fin
2 Inverter PCB
3 Plastic Support
4 Mounting Plate