Hitachi RAS-10HRNM, Service Manual, Page: 448 / 482

Protection function
Applicable model RAS-(2-3)HVRN1(E)(S) RAS-(4-6)HVRNS1E RAS-(8/10)HRNSE
Excessive high or low
voltage for inverter
Excessive low voltage at a voltage is lower than
194 V DC
Excessive high voltage at a voltage is higher than
400 V DC (2/2.5/3HP) or 423 V DC (4/5/6HP)
Excessive low voltage at a voltage is
lower than 350 V DC
Excessive high voltage at a voltage is
higher than 750 V DC
Protection function
Abnormality of current
sensor (0A detection)
Stoppage at a current of compressor smaller than 1.5A.
When the frequency is 15 to 18Hz after starting (except 4-6 HP)
Cause of abnormality:
Failure of current sensor.
Failure of IPM (2/2.5/3/8/10 HP) or DIP-IPM (4/5/6 HP).
Failure of compressor/fan motor.
Disconnected wiring.
Overcurrent protection
for inverter
RAS-(2/2.5)HVRN1(E)/RAS-3HVRNS
(1)
(2)
(4)
10µs
50ms
30s Time
Rated
Current
x 150%
Rated
Current
x 105%
RAS-(4-6)HVRNS1E
Time
Detecting current is more than
150% of the rated current.
Rated
current
x 150%
Rated
current
x 105%
RAS-(8-10)HRNSE
(1)
(2)
(4)
(3)
10 µs 50 µs
30 s
Time
Detecting current is more than
150% of the rated current
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
Condition is maintained longer than 30 seconds or accumulated longer than 3 minutes during
10 minutes sampling time.
11 Electrical checks of
main parts
440
SMGB0060 rev. 1- 12/2010