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Trouble-shooting
© MOSA
1.1-09/04
Problem
Incorrect maximum voltage
under no-load conditions
Engine always at idle speed
Engine always at maximum
speed
Insufficient power during
welding or generation
Irregular or inconsistent
welding current
RESISTENCE OF WINDING AT 20°C
Output in weld mode
Between green / black cable
Between green / red cable
Between black / red cable
Auxiliary power outputs 230 Vdc
Between the black cables: R / S
Between the black cables: R / T
Between the black cables: S / T
Auxiliary power outputs 110Vdc
Between the black cables: R / S
Between the black cables: R / T
Between the black cables: S / T
Possible cause
1) Incorrect maximum engine
speed
1) Faulty circuit
1) faulty circuit
2) Faulty solenoid
1) Engine
1) alternator
windings
insulated from earth
2) welding chopper bridge not
insulated from earth
3) power cables not insulated
from earth
4) faulty circuit
Ω
NOTE
(ohm)
0,030
All cables of the same colour are
0,030
connected in parallel
0,030
1,2
Cable Y is connected to the centro
1,2
stella of the three phase circuit
1,2
1,0
Cable Y is connected to cable T
1,0
1,0
MAGIC WELD
Solution
1) Adjust the maximum engine
speed as shown on page M34.
1) Replace
1) Replace;
2) Check that the resistance of the
solenoid winding is approximately
10 ohm.
1) Dirty petrol filter,
dirty air filter,
dirty carburetor.
See engine instruction booklet.
not
1) Disconnect all the outputs; 3 for
welding which go to the chopper
bridge and 4 for auxiliary power
which go to the circuit board. Use
a multimeter to check the
insulation of the alternator;
2) disconnect the 3 welding cables,
the + and - for welding, the black
wire and the connector which go
to the circuit board, Use a
multimeter to check that the
bridge is insulated from the earth.
3) check that the cables inside the
aluminium casting, are properly
insulated;
4) Replace
M
40.2.
1
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