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F-40
MULTI-SOURCE METER ACCURACY CHECK (Continued)
METER ACCURACY CHECK
1. With power off, connect a resistive load and the
meter grade shunt to the output terminals. Use
either a resistive grid, multisource welders or a
combination of both.
2. Turn machine on.
3. Adjust the resistive load to approximately 533 amps
DC as read by the DC ammeter via the meter grade
shunt.
4. The Multi-Source digital display should read
approximately "100".
5. If the result is satisfactory the the test is over and
the machine may be reassembled. If the required
results are not obtained proceed to the next sec-
tion.
J2
J1
J3
TROUBLESHOOTING & REPAIR
FIGURE F.18. R49 TRIMMER
Control Board
MULTI-SOURCE
PROCEDURE
TO
METER IS OUT OF RANGE
If the measured current is within the acceptable cur-
rent range (approximately 533 amps DC) and the
Multi-Source digital display does not read approxi-
mately "100" then the meter must be recalibrated. The
Multi-Source digital display is controlled by a current
sensing circuit on the Control board. The display
should read "100" when the machine output is a little
over 40 kW. To adjust the digital meter, trimmer resis-
tor R49 on the Control board may be adjusted. See
Figure F.18. for location of R49 trimmer.
If the meter can not be calibrated using this procedure
then the Control board or the output shunt may be
faulty. See the Wiring Diagram.
Note: The output shunt is rated at 50 mv @ 800 A.
R49
F-40
RECALIBRATE
IF
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