MSG Equipment MS002 COM - Diagnostics of Alternator that Doesnt Have the Integral Voltage Regulator

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User manual
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5.3. For Lamp type alternators, the stabilizing voltage value shall be set within 14 - 14.8 V for 12V
alternators, and within 28 - 29.8 V for 24V alternators.
5.4. If the alternator is equipped with the control lamp indicator it shall go off.
5.5. If the diagnosed alternator is of COM type, the mechanical error shall disappear.
6. Check the alternator voltage regulator as follows:
6.1. With the knob ROTATION SPEED, set the speed within 1500-2000 rpm.
6.2*. With the knob REGULATION GC, set smoothly the alternator output voltage within 13 - 15V.
The measured voltage shall vary in proportion to the nominated one.
*For the Lamp type alternators without voltage control, this paragraph is skipped.
7. Check the alternator operation under the load as follows:
7.1. Set the speed within 2500-3000 rpm rotating the knob ROTATION SPEED.
7.2. Rotate the knob ELECTRICAL LOAD to smoothly increase the alternator load. To effectively
check the alternator condition, the current load rate of 50 – 70 A is enough. At the same time,
the output voltage value shall remain constant while the alternating current value (I, AC) in the
circuit B+ shall not exceed 10% of the nominated load value (e.g., at the load of 50A, the value I,
AC shall not exceed 5A).
8. Once the alternator diagnostics is finished, shed the alternator load and stop the drive briefly
pressing ELECTRICAL LOAD and ROTATION SPEED. Then press the button Alternator & starter
tester and dismount the alternator from the bench.
6.3. Diagnostics of alternator
that doesn’t have the integral voltage regulator
The diagnostics of the alternators that don’t have the integral voltage regulator is carried out the
same way as the diagnostics of the Lamp type alternators (see p. 5.3) - with several differences:
1) The following alternator terminal references: DF, F, FLD, 67 shall be connected to GC bench
terminal (fig. 3).
2) Choose the diagnostic mode F/67.
WARNING! The function F/67 allows to check 12V alternators and B-circuit alternator types
only, meaning the alternators that have one of the voltage regulator brushes connected to B-,
and the control of the exciting coil is carried out by the brush connected to B+.