3-2
MAIN PARTS
NOTE:
Characteristics are fluctuated by the current minimize control.
Overcurrent Protection
for Inverter
(1)
(2)
(3)
(4)
Short-Circuit Trip of Arm
Instantaneous Overcurrent Trip
Instantaneous Overcurrent Trip
Electronic Thermal Trip
Condition is maintained longer than 30 seconds or accumulated
longer than 3 minutes during 10 minutes sampling time.
(1)
(2)
(3)
(4)
Some of the output terminals between "U" and "V", "V" and "W",
"W" and "U" has a short-circuit.
Running current reaches the maximum rated current.
Abnormal temperature is measured by internal thermistor.
Control voltage decreases abnormally.
Overload Control
Fin Temperature
Increase
Earth Detection
Protection Function
Transistor module or ISPM has four protection function for self-protection.
Protection of
Transistor Module
The unit is stopped when the ISPM temperature is higher than 100
o
C.
(Only for 24 and 30HP)
The unit is stopped when the compressor is earthing.
(Only for 24 and 30HP)
Overload control as a current greater than (Rated Current X105%).
Overload control release at a current smaller than (Rated Current X 88%).
Internal Protection
Transistor Module or ISPM
20
µ
s
20ms
30s
Time
(1)
(2)
(3)
Detecting current is more than
150% of the rated current.
Rated Current
150%
Rated Current
105%
(4)
