Troubleshooting and repair, Current transducer test (continued) – Lincoln Electric INVERTEC SVM199-A User Manual
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CURRENT TRANSDUCER TEST (continued)
TROUBLESHOOTING AND REPAIR
F-45
F-45
INVERTEC® V450-PRO
5. Turn on the V-450 PRO. Check for the correct
DC supply voltage to the current transducer at
plug J8. See Figure F.10.
A. Pin 2 (lead 212+) to pin 6 (lead 216-)
should read +15 VDC.
B. Pin 3 (lead 213-) to pin 6 (lead 216+)
should read -15 VDC.
If the DC supply voltages are not present, the
control board may be faulty.
6. If both of the supply voltages are low or missing,
check the associated leads between plug J8
and current transducer plug P91 and the
Control Board.
7. With the V-450 PRO triggered, check the feed-
back voltage from the current transducer. The
current feedback voltage can be read at plug J8
on the Control Board.
A. Pin 1 (lead 211) to pin 6 (lead 216) should
read 2.0 VDC (machine loaded to 250
amps).
8. If for any reason the machine cannot be loaded
to 250 amps, Table F.5 shows what feedback
voltage is produced at various current loads.
9. If the correct supply voltages are applied to the
current transducer, and with the machine
loaded, the feedback voltage is missing or not
correct, the current transducer may be faulty.
Also make certain that lead 211 (plug J8 pin 1)
has continuity (zero ohms) between the current
transducer and the control board. See the
Wiring Diagram.
10. Install the right side case cover using the 3/8”
nut driver.
TABLE F.5 - CURRENT FEEDBACK AT VARIOUS OUTPUT LOADS
OUTPUT LOAD CURRENT
500
450
400
350
300
250
200
150
100
50
EXPECTED TRANSDUCER FEEDBACK
VOLTAGE
4.0
3.6
3.2
2.8
2.4
2.0
1.6
1.2
0.8
0.4