MSG MS012 COM, Operation Manual

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English
tester MS012 COM
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Figure 21. Voltage regulator ARE6149P connected to the tester terminals
Connection of voltage regulator ARE6149P has a special aspect. Figure 20 shows only one
terminal – F, for connection of cable F1. The other cable – F2 must be connected to terminal B-.
Consequently, one of the brushes is permanently connected to B- of the alternator, while the
excitation winding is controlled through terminal B+.
3.3 Voltage regulator diagnostics
Before launching the diagnostic procedure, set up the resistance of the stator winding in the
main menu (Fig.4) with adjustment knob EL LOAD. In case, the resistance value of the stator
winding is known, set this (measured) value. If the resistance value is not known, set it as follows:
• 5 Ohm for 12V;
• 22 Ohm for 24V.
The common diagnostic procedure for a majority of voltage regulators is as follows:
1) Connect the voltage regulator to the tester output terminals.
2) Set up the resistance of the stator winding.
3) Select the nominal voltage of the tested voltage regulator.
4) Select the type of the tested voltage regulator.
5) Evaluate the control lamp behavior: red indication must be on when the speed is below
700 rpm, the indication must turn white (off) when the speed is above 800-1200 rpm.
6) Evaluate the voltage regulator response to the load change set with adjustment knob EL LOAD.