Tweco 6000 Cutting System - Manual (Page 23)

Manual 0-2572 19 SERVICE
• If present, check for open in Torch Supply Leads
Assembly signal wires.
15. If the Arc Starter PC Board 24 VAC red LED was
ON from the test in Step 5 or 9, place RUN/SET/
PURGE to RUN position.
16. Press start and go through a start sequence. After
pre-flow the PILOT and DC LEDs are ON. When
the Power Supply is activated and the DC and PI-
LOT LED's are ON, there should be greater than 220
VDC between the torch tip (+) and electrode (-).
WARNING
High voltage (300-400vdc) is present in Arc
Starter Box.
17. Measure between E1(+) and E2 (-) on the Arc Starter
PC Board.
WARNING
DO NOT accidently measure P1 and P2, studs
and brass nuts, where the CD Transformer (T1)
connects to the Arc Starter PC Board.
• If voltage more than 220 VDC is present Arc Starter
PC Board is defective.
NOTE
A dirty or incorrect gap in spark gap could cause
the same problem. Gap should be 0.015 +/- 0.001"
and is not adjustable.
• If voltage is less than 220 VDC, proceed to Step 18.
18. In the Power Supply measure the DC voltage be-
tween the negative power lead and the red pilot lead.
• If greater than 220 VDC, check for open connec-
tions through the Power Supply connections,
Torch Supply Leads Assembly, and Arc Starter
Box input and output connections.
• If less than 220 VDC, can be caused by a shorted
torch or torch leads.
• No voltage can be caused by the Pilot Control (PCR)
contactor in the Power Supply not closing. Refer
to the Power Supply Service Manual under symp-
toms of No Pilot.