8 Electrical checks of the main parts
Inverter
SMGB0091 rev.2 - 11/2015
131
8
Protection function
Applicable model
RASC-(4-6)HNPE
RASC-(8/10)HNPE
Overcurrent protection for inverter
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: it is detected when current valve is over rated current x
150%.
4
Electronic thermal trip: it is detected when current valve rated current x 105% for over 30
seconds or for over 3 minutes in total within 10 minutes.
?
N O T E
(*): Internal protection IPM.
Condition is maintained longer than 30 seconds or accumulated longer than 3 minutes during 10
minutes sampling time.
Protection of IPM
IPM has four protection functions for self-protection:
1
Short circuit in any of the “U”, “V” or “W” terminals.
2
Running current reaches the maximum rated current.
3
Abnormal temperature is measured by internal thermistor (for 8/10HP).
4
Control voltage decreases abnormally.
Overload control
Overload control as a current greater than (rated current X105%).
Overload control release at a current smaller than (rated current X 88%).
Fin temperature increase
The unit is stopped when the fin temperature is higher than 90ºC (for 4-6HP) or 100°C
(for 8/10HP).
Earth detection
The unit is stopped when the compressor is earthing.