Troubleshooting and repair, Fan control and motor test (continued), Warning – Lincoln Electric INVERTEC SVM199-A User Manual

Page 90: Test procedure, Fan control test procedure, Solid state relay

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FAN CONTROL AND MOTOR TEST (continued)

TROUBLESHOOTING AND REPAIR

F-50

INVERTEC® V450-PRO

TEST PROCEDURE

1. Remove the input power to the V450-PRO

machine.

2. Using the 3/8” nut driver, remove the case top

and control box cover.

3. Perform the Capacitor Discharge Procedure.

4. Carefully apply the correct input power to the

machine.

5. Carefully check for 115VAC at X3A and 444.

See Figure F.12.

WARNING: HIGH VOLTAGE IS PRESENT AT
THE RELAY TERMINALS.

6. If the 115VAC is low or not present, perform the

Auxiliary Transformer Test. Check circuit
breaker CB2 and associated leads for loose or
faulty connections. See Wiring Diagram.

7. Energize the weld output terminals (Select

Weld Terminals ON) and carefully check for
115VAC at the fan motor leads. If the 115VAC
is present and the fan is not running, the fan
motor may be faulty. See Wiring Diagram.

WARNING: HIGH VOLTAGE IS PRESENT AT
THE FAN LEADS.

ELECTRIC SHOCK can kill.

High voltage is present when input
power is applied to the machine.

FAN CONTROL TEST PROCEDURE

1. Locate plug J7 on the control board. Do not

remove the plug from the control board. See
Figure F.12.

2. Energize the weld output terminals (Select

Weld Terminals ON) and carefully check for
+15VDC at plug J7 pins 15 & 16 on the control
PC board. If the 15VDC is present and the fan
is not running then the relay or fan may be
faulty. If the 15VDC is not present when the
weld terminals are energized, then the control
board may be faulty.

HIGH VOLTAGE IS PRESENT
AT THE SWITCH BOARD.

Fan comes on when

output is enable

FAN CONTROL (+15VDC)

FAN CONTROL (-)

J7-15

J7-16

CR2

X3A

444

TP4

FAN