Valley FABRICATOR 251 Service Manual - Fabricator 251
7-6
August 22, 2008
FABRICATOR 251
SERVICE MANUAL
7.07 Wire Feed & Weld Test
A. Close the PRESSURE ADJUST DEVICE. Connect the GUN
POLARITY LEAD to the POSITIVE WELDING TERMINAL
(+).
B. Position the gun in a position ready to weld. Close the
Gun Switch
1. Gas flows
2. Contactor Energizes
3. Wire feeds out of gun
4. Welding arc establishes
This completes the Wire Feed Test. If the above does not
function as noted then proceed to Section 7.12 Wire Feed
Problems.
7.08 Primary Power Problems
A. Green Indicator in ON/OFF Switch is not
illuminated and fan does turn when ON/OFF
switch is in the ON position.
1. Incorrect or insufficient primary voltage
a. Measure voltage at Primary Power Receptacle.
If voltage is not correct check primary fuses/
breakers.
2. Defective or improperly wired input power cable
or plug.
a. Measure for 230VAC primary voltage at the
terminal block where the input power cable is
connected. If incorrect, check wiring in plug
and continuity of primary input cable.
3. Circuit breaker CB1 tripped
a. Reset breaker
4. Defective or improperly wired input power cable
or plug.
a. Measure for primary voltage at the Input
Terminal Block between terminals 1 & 2 for 208
VAC input or between terminals 1 & 3 for
230VAC input (see Input Terminal Block Figure
7.1).
B. Green Indicator in ON/OFF Switch is illuminated
but digital display is off and fan does not turn,
when ON/OFF switch is in the ON position.
1. Circuit Breaker CB1 tripped
a. Reset CB1
2. Defective ON/OFF Switch SW1
a. Measure for 230VAC at Input Terminal Block
between terminals 4 & 5. If voltage is not
present, replace SW1.
3. Defective Fan Motor/Aux Transformer Assembly
M1
a. Measure for 230VAC at Input Terminal Block
between terminals 4 & 5. If voltage is present,
replace M1.
4) Green Indicator in ON/OFF Switch is illuminated
and fan turns, but digital display is off, when ON/
OFF switch is in the ON position.
1) Defective PCB 4
a) Measure for 32VAC at PCB4 between X1-1
to X1-3. If voltage is correct, replace PCB 4.