Electrical system
Checking of the regulator
Dismantling the diode bridge
In order to check the diode bridge and stator windings
the diode bridge should be dismantled.
Special tool: Regulator tester 884892-1
Check before testing that the instrument�s batteries
have the correct voltage. Press in the button "Test" and
check that the green lamp ("Batt.") lights. Replace the
batteries (2 pcs alkaline, 9 V) if the lamp does not light.
Unsolder the three stator windings. Avoid excessive
heat since this can damage the diodes. Release the
nuts (note how the washers and nuts are fitted).
Check measurement of the diode bridge
The batteries are in a compartment underneath the in-
strument.
Set the multimeter in the position "Diode test". Be very
careful to obtain good contact with the probes during all
measurements.
Connect the tester�s grey cables to the carbon.
Connect the tester�s brown cable to the regulator�s yel-
low and brown cables which should be put together dur-
ing the test.
Checking of the B+ diodes
Connect the measuring instrument�s positive probe to
one of the stator winding connections (1-2-3). Connect
the instrument�s negative probe to the diode plate�s B+.
Read off the instrument. A normal value should lie be-
tween 450 and 650 mV, which is the voltage drop over
the diode. An other value indicates a defective diode.
Connect the tester�s black cable to the regulator�s black
cable.
Press the "Test" button and at the same time turn the
rheostat from the "0" marking to the "1" marking.
Check the other B+ diodes by moving the positive
probe to the respective connection (1-2-3).
Check the B+ diodes in the opposite direction of current
flow by switching the position of the positive and neg-
ative probes. Carry out the same measurement proced-
ure as above. The instrument should during this meas-
urement show a one "1" (to far left). If the instrument
shows another value the diode is defective.
Regulator in good condition
The red and green lamps should light from "0". The red
lamp should go off at the "1" marking.
Faulty regulator
Checking of the B- diodes
Replace the regulator if the red lamp lights constantly
when the rheostat is turned, or if it does not light in any
position.
Connect the instrument�s positive probe to the diode
plate�s B- connection and the instrument�s negative
probe to the respective stator winding connection
(1-2-3)
Note: The "2" marking on the tester is not used for this
type of regulator.
Read off the instrument as before. A normal value
should lie between 450 and 650 mV. Another value in-
dicates a defective diode.
Check measurement of rotor winding
After the regulator and carbon brushes have been re-
moved it is possible to measure the resistance of the ro-
tor.
Set the measuring instrument in position Q. Make sure
that the probes have good contact between the slip
rings. The resistance of the rotor should be 3.0-5.0 Q.
Check also
no earth fault occurs by measuring be-
tween slip ring and earth.
75
| Categories | Volvo Penta Manuals |
|---|---|
| Tags | Volvo Penta MD2010, Volvo Penta MD2020, Volvo Penta MD2030, Volvo Penta MD2040 |
| Download File |
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| Copyright | Attribution Non-commercial |
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Pages 58 and 59 are missing from Volvo Penta MD2010 MD2020 MD2030 MD2040 Workshop Manual. I need only these pages at present!