Fan Control Test Procedure; Plug J20 - Lincoln Electric INVERTEC V350-PRO Service Manual

F-43
FAN CONTROL AND MOTOR TEST (continued)
7. If the 115VAC is low or not present check cir-
cuit breaker CB2 located on the front panel. If
the circuit breaker is OK, perform The
Auxiliary Transformer Test. Check plug J22,
circuit breaker CB2 and associated leads for
loose or faulty connections. See the Wiring
Diagram.
8. Energize the weld output terminals (Select
Weld Terminals ON) and carefully check for
115VAC at plug J22 pin-1 to J22 pin-4 (fan
leads). See Figure F.13. If the 115VAC is pre-
sent and the fan is not running then the fan
motor may be faulty. Also check the associat-
ed leads between plug J22 and the fan motor
for loose or faulty connections. See the Wiring
Diagram. WARNING: HIGH VOLTAGE IS
PRESENT AT THE SWITCH BOARD.
9. If the 115VAC is NOT present in the previous
step then proceed to the fan control test.
Lead 715+
TROUBLESHOOTING AND REPAIR
FIGURE F.14 PLUG J20
Lead 716-
1 2
5 6

Plug J20

V350-PRO

FAN CONTROL TEST PROCEDURE

1. Locate plug J20 on the switch board. Do not
remove the plug from the switch board. See
Figure F.12 and F.14.
2. Energize the weld output terminals (Select
Weld Terminals ON) and carefully check for
+15VDC at plug J20 pin-6+ to J20 pin-2-
(leads 715 to 716). See Figure F.14. If the
15VDC is present and the fan is not running
then the switch board may be faulty.
15VDC is not present when the weld terminals
are energized then the control board may be
faulty. Also check plugs J20, J7, and all asso-
ciated leads for loose or faulty connections.
See the Wiring Diagram.
WARNING: HIGH VOLTAGE IS PRESENT AT
THE SWITCH BOARD.
3. Remove the input power to the V350-PRO.
Note: The fan motor may be accessed by the
removal of the rear panel detailed in The
Current Transducer
Replacement Procedure.
4. Replace the case wrap-around cover.
3 4
7 8
F-43
If the
Removal and