21
Kemppi Oy
IGBT module NTC is integrated inside the module:
Measure the resistance, it should be between 14-2,8kΩ in a cool machine (in environ-
ment temperature 0-40°C)
While temperature rises, resistance lowers and at 500Ω point the inverter stops and gives
overheat alert.
A broken NTC has usually hundreds of kilo ohms resistance, no value at all or short cir-
cuit.
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