Protection function:
Overcurrent protection for Inverter
10ms
Current
50ms 30s Time
(1)
(2)
(3)
Rated Current of
Transistor Module (IPM)
Rated Current x 105%
(4)
1. Short-circuit trip of arm (*).
2. Instantaneous overcurrent trip (*).
3. Instantaneous
Overcurrent Trip, When detecting current is more than rated
current of transistor module, overcurrent is detected.
4. Electronic Thermal Trip. When the current detected by current sensor exceeds
105% of the rated current continuously for 30 seconds or for 3 minutes in total
during a 10 minutes period, overcurrent is detected.
(*) Internal Protection Transistor Module (IPM).
Protection of Transistor module (IPM)
The transistor module (IPM) has four protection functions to auto-protect itself:
1. Some
of the output terminals between “U” and “V”, “V” and “W” , “W” and “U”
has short-circuit.
2. Running current reaches the maximum rated current.
3. The abnormal temperature is measured by internal thermistor.
4. Abnormal decrease in control voltage.
Overload control
The overload control with a current that is greater than the rated current X 105%.
The overload control release at a current that is smaller than the rated current
X 88%.
Fin temperature increase The unit stops when the IPM temperature is higher than 90 °C.
Earth detection The unit stops when the compressor is earthing.
11.1.2 Inverter power Unit structure
1 Radiated fin
2 Transistor module
3 Diode module
4 Inverter PCB
11 Electrical checks of the
main parts
331
SMGB0065 rev. 1 - 12/2010
11
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