Hitachi Utopia PAS-3HVRG, Service Manual

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3-1
MAIN PARTS
3. MAIN PARTS
3.1 Inverter
3.1.1 Specifications of Inverter
Applicable Model
Applicable Power Source
Output Voltage (Maximum)
Output Current (Maximum)
Control Method
Range Output Frequency
Accuracy of Frequency
Controlled Frequency
Output / Characteristics
Soft Start Stop
Protection Function
Excessive High or Low
Voltage for Inverter
Abnormality of Current
Sensor (0A Detection)
Failure of Current Sensor
Failure of ISPM
Failure of Compressor
Disconnected Wiring
Protection Function
Overcurrent Protection
for Inverter
(1) Short-Circuit Trip of Arm
(2) Instantaneous Overcurrent Trip
(3) Instantaneous Overcurrent Trip
(4)
Protection of ISPM ISPM has four protection function for self-protection.
(1)
(2) Running current reaches the maximum rated current.
(3) Temperature is measured by internal thermistor increases excessively.
(4) Control voltage decreases excessively.
Overload Control
Fin Temperature Decrease
The unit is stopped when the ISPM temperature is higher than 100
o
C.
Earth Detection The unit is stopped when the compressor is earthing.
Some of the output terminals between "U" and "V", "V" and "W",
"W" and "U" has a short-circuit.
Overload control as a current greater than (Rated Current X105%).
Overload control release at a current smaller than (Rated Current X 88%).
Excessive Low Voltage at a voltage is lower than 194V DC
Excessive High Voltage at a voltage is higher than 440V DC
Stoppage at a current of compressor smaller than 1.5A.
When the frequency is 15 to 18Hz after starting.
Cause of Abnormality:
Electronic Thermal Trip
Condition is maintained longer than 30 seconds or accumulated
longer than 3 minutes during 10 minutes sampling time.
RAS-3HVRG, RAS-4HVRG, RAS-5HVRG
1 Phase, 220V, 240V 50Hz/220V 60 Hz
200V, 3 Phase
14.5/16/24.5 (3HVRG/4HVRG/5HVRG)
Characteristics are general idea.
0.5Hz/S, 1Hz/S, 3Hz/S, 6Hz/S, 30Hz/S (5 Steps)
Vector Control
25 to 115Hz
0.01Hz at Applicable Frequency Range
1Hz
Internal Protection of ISPM
200
115Hz
0
[ V ]
f (Hz)
(1)
(2)
(3)
(4)
Rated Current
x 150%
Rated Current
x 105%
20
μ
s 50ms
30s