Tweco Weld Sequencer - Manual (Page 43)

Manual 0-2023 37 Section Name
G. Potentiometer Assembly Replacement
NOTE
Refer to Section 6.05 for parts list and overall de-
tail drawing.
1. Disconnect all power to the welding system.
2. Remove cover or side panels (enclosure extension).
3. Remove the two welding console plasma gas hoses
from the rear of the Weld Sequencer Enclosure. Re-
move the four screws holding the GS1 gas hose con-
nectors to the Enclosure rear panel.
4. Remove connector from the rear of GS1.
5. Remove the four screws securing GS1 to the front of
the Weld Sequencer Enclosure.
6. Slide GS1 out of the Weld Sequencer Enclosure.
7. Remove the cover from GS1.
8. Disconnect the two connectors (motor and pot) on the
Motor/ Valve/Pot Assembly.
9. Remove the four screws securing the Assembly to the
GS1 rear panel. If the complete Motor/Valve/Pot As-
sembly is to be replaced go to Section 5.05-H.
10. Remove the two screws securing the pot clamp to the
mounting bracket. Loosen the hex nut securing the
pot assembly to the mounting bracket.
11. Slide the pot assembly out of the mounting bracket
slot.
12. Plug the new pot assembly into the connector in the
GS1 wiring harness.
13. Plug in the Weld Sequencer Enclosure to a power
source and turn to ON.
14. Move MIN GAS FLOW switch to MIN (0) position.
15. Move UP/DOWN switch momentarily to DOWN
position.
16. Adjust the pot clockwise until the SLOPING light
goes out and the MIN light stays on continuously. This
is about 1-1/2 turns from max clockwise rotation.
17. Move GS1 to “OFF” and unplug the Weld Sequencer
Enclosure
18. Keeping the pot in this position install in the mount-
ing bracket slot and engage the gear teeth with the
pinion gear teeth.
19. Install the pot clamp on the outside of the mounting
bracket and secure with the two screws provided.
20. With the pot gear firmly engaged with the pinion
gear, tighten the large hex nut on the gear side of the
bracket.
H. Reinstalling the Motor/Valve/Pot Assembly
1. Make sure the two plasma gas hoses are through the
holes designated on the GS1 rear panel. Add pipe seal-
ant to the two hose fittings and install “plasma out”
hose in the bottom of the gas valve assembly. Install
“plasma in” hose in the top of the gas valve assembly.
2. Secure Motor/Valve/Pot Assembly to the rear panel
of GS1 with the four screws provided (through the
four grommets).
3. Connect the motor assembly and pot assembly plugs
to the GS1 wiring harness.
4. Replace GS1 cover
5. Feed the GS1 plasma gas hose through the Weld Se-
quencer Enclosure front panel opening and secure to
the Enclosure rear panel in the proper holes.
6. Connect the Enclosure wiring harness plug J3 to the
rear connector on the GS1.
7. Position GS1 into the Enclosure front panel opening
and secure with the four button head screws.
8. Connect the plasma gas hoses from the Welding Con-
sole to the appropriate fittings on the Enclosure rear
panel.
9. Replace either Enclosure cover or side panels as re-
quired.