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TROUBLESHOOTING AND REPAIR
CURRENT TRANSDUCER TEST (continued)
F-39 F-39
V350-PRO
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9. Check the feedback voltage from the current
transducer using a resistive load bank and
with the V350-PRO in mode 200. Mode 200 is
a constant current test mode. This mode can
be accessed from the front panel of the V350
by pressing and holding the Mode Select but-
ton while turning the machine on. Then, rotate
the output knob while still holding the Mode
Select button in until the displays read “Mode
200”. Release the Mode Select Button and
the machine will be in mode 200. With the
V350-PRO in mode 200, apply the grid load
across the output of the V350-PRO, set
machine output to 300 amps and enable
WELD TERMINALS. Adjust the grid load to
obtain 300 amps on the external ammeter and
check feedback voltages per Table F.5.
A. Pin 1 (lead 801) to Pin 6 (lead 806) should
read 2.4 VDC (machine loaded to 300
amps).
10. If for any reason the machine cannot be
loaded to 300 amps, Table F.5. shows what
feedback voltage is produced at various cur-
rent loads.
11. 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.
Before replacing the current transducer, check
the leads and plugs between the control board
(J8) and the current transducer (J90). See The
Wiring Diagram. For access to plug J90 and
the current transducer refer to: Current
Transducer Removal and Replacement
Procedure.
12. Remove input power to the V350-PRO.
13. Replace the control box top and any cable ties
previously removed.
14. Install the case wraparound cover using the
5/16” nut driver.
TABLE F.5
OUTPUT LOAD CURRENT
EXPECTED TRANSDUCER FEEDBACK
VOLTAGE
300
250
200
150
100
2.4
2.0
1.6
1.2
0.8