Hitachi RPI-0.8FSG1 Service Manual page 278

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