MarelliMotori M31FA600A M EC-20 Manual De Instrucciones página 41

Possible failure causes:
- Mechanical damage due to impact/shock.
- The alternator output voltage is higher than the rated voltage.
- You cannot set the proper value using the VOLT trimmer.
- Not enough contact between the AVR terminals and the FASTON connectors, resulting in sparks
and voltage peaks.
Actions:
- Replace the AVR.
#2 - VISUAL / MULTI-METER CHECKS
CHECK F – IGBT
Visual inspection:
- Check that the IGBT shown in the
figure is not damaged.
Possible damage types are:
3- IGBT blown.
4- IGBT broken.
Multi-meter check:
1- In the multi-meter, select the diode
measurement mode.
2- Connect the multi-meter probes to
terminals - and 0 of the AVR.
Expected values are:
COM probe on 0: 0.8 to 0.9V.
COM probe on -: open (OL).
If any of the above measurements is
not met, the IGBT is damaged.
Check result:
- If the result of all the above checks has been positive, tick the ok box in section #2 of the report
form, Check F.
Otherwise leave the box blank.
In case of component failure:
Possible effects on regulation:
- The alternator output voltage is lower than the rated voltage and equal to the residual one.
You cannot set the proper value using the VOLT trimmer.
- The alternator output voltage is higher than the rated voltage.
You cannot set the proper value using the VOLT trimmer.
Possible failure causes:
- Mechanical damage due to impact/shock.
- Improper connection on terminals + and -.
- Short circuit between terminals + and -.
- Not enough contact between the AVR terminals and the FASTON connectors, resulting in sparks
and voltage peaks.
Actions:
- Replace the AVR.
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M31FA600A MEC-20
IGBT
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