FABRICATOR 281
ADVANCED TROUBLESHOOTING
-
Manual No. 0-4880B
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
C. Press the VOLTAGE / AMPERAGE SELECTOR
SWITCH. The display will change to display the ac-
tual welding output amperage.
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 (SW1) on the
Power Supply is not illuminated. When ON/OFF
switch (SW1) on the Power Supply is in the ON
position, the fan does not run and the Digital
Display is off. Green Indicator in ON/OFF Switch
(SW4) on A2281 is not illuminated .
1. Incorrect or insufficient primary voltage
a. M e a s u r e v o l t a g e a t P r i m a r y P o w e r
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 (SW1) on Power
Supply is illuminated. When ON/OFF switch (SW1)
is in the ON position, the fan does not run and the
Digital Display is off. Green Indicator in ON/OFF
Switch (SW4) on A2281 is not illuminated.
1. Defective ON/OFF Switch SW1
a. Measure for 230VAC at Input Terminal Block
between terminals 4 & 5. If voltage is not
present, replace SW1.
2. 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.
C. 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, re-
place PCB 4.
D. Green Indicator in ON/OFF Switch (SW1) is il-
luminated and fan , Digital Display is on. Green
Indicator in ON/OFF Switch (SW4) in A2281 is not
illuminated.
1. Defective or improperly installed A2281 Umbilical
Cable.
a. Measure for 230VAC at the A2281 Terminal
Block between terminals 1 & 4. If voltage is
not present, check continuity of umbilical
cable wires and check connections.
Summary of Contents for 281 FABRICATOR
Page 54: ...fabricator 281 OPERATION 4 18 Manual No 0 4880B NOTES ...
Page 80: ...Fabricator 281 CIRCUIT OPERATION 8 Manual No 0 4880B ...
Page 98: ...fabricator 281 APPENDIX A Manual No 0 4880B APPENDIX 4 SPOT TIMER CIRCUIT DIAGRAM Art A 07521 ...
Page 104: ...fabricator 281 APPENDIX A 12 Manual No 0 4880B ...
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