Hitachi RAS-2-HVNP Service Manual page 455

11. Electrial checks of main parts
Applicable model
Excessive high or low voltage
for inverter
Abnormality of current sensor
(0A detection)
Overcurrent protection for
inverter
Protection of transistor mo-
dule
Overload control
Fin temperature increase
Earth detection
441
Protection function
RAS-(4-6)HNPE RAS-(4-6)HNCE
Excessive low voltage at a voltage is lower
than 350 V DC
Excessive high voltage at a voltage is higher
than 750 V DC
Stoppage at a current of compressor smaller
than 1.5A.
When the frequency is 15 to 18Hz after star-
ting. Cause of abnormality:
Failure of current sensor
Failure of IPM/DIP-IPM/ ISPM
Failure of compressor / fan motor
Disconnected wiring
Rated
current
x 150%
Rated
current
x 105%
1 Short-circuit trip of arm *)
2 Instantaneous overcurrent trip *)
3 Instantaneous overcurrent trip
4 Electronic thermal trip
*) Internal protection IPM
Condition is maintained longer than 30 seconds or accumulated longer than 3 minutes during 10 minutes sampling
time.
IPM 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 (for 8 to 12HP).
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 fin temperature is higher than 80ºC (for 3HP), 90ºC (for 4 to 6HP Premium), 92ºC (for
4 to 6HP Standard) or 100ºC (for 8 to 12HP).
The unit is stopped when the compressor is earthing.
SMGB0079 rev.0 - 01/2013
RAS-(8-12) RAS-(2-2.5)HVNP
RAS-3HVNPE
HN(P/C)(E) RAS-3HVNC
Excessive low voltage at a voltage is lower than 194 V DC
Excessive high voltage at a voltage is higher than 400 V DC
Detecting current is more than
150% of the rated current.
RAS-(4-6)HVNPE RAS-(4-6)HVNCE
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