Lincoln Electric INVERTEC SVM199-A - Manual (Page 71)

INPUT BOARD TEST PROCEDURE (continued)
TROUBLESHOOTING AND REPAIR F-31 F-31
INVERTEC® V450-PRO
6. Remove input power to the INVERTEC® V-
450 PRO. If any of the voltages are low or
not present, perform the Input Contactor
Test. If that checks out, the Input Board
may by faulty.
7. Reconnect lead X4 to the main input contac-
tor CR1 coil terminal.
8. Carefully apply the correct input voltage to
the INVERTEC® V-450 PRO.
ELECTRIC SHOCK can kill.
High voltage is present when
input power is applied to the
machine.
9. Turn on the INVERTEC® V-450 PRO.
Check for the presence of 24 VAC from
lead X4 to lead 601. See Figure F.6. If the
voltage is not present, perform the
Auxiliary Transformer #1 Test.
9. This 24 VAC is the coil voltage for main
input contactor CR1. It will normally be
present approximately 12 seconds after
input line switch (SW1) is activated.
10. When the test is completed, remove input
power from the INVERTEC® V-450 PRO.
11. Install the case top using the 3/8” nut driver.
WARNING
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