Tweco 1000 Merlin(Dec2004) - Manual (Page 54)

SERVICE 5-8 Manual 0-2708
9. Measure for 36 VAC between J1-1 and J1-3 on the connec-
tor.
• If 36 VAC is at the connector, Arc Starter PC Board is
defective.
• If 36 VAC is not present at J1 proceed to Step 10.
10. Place the RUN/SET switch on the Power Supply to the RUN
position.
11. Place the main power switch on front panel of the Power
Supply to OFF.
12. Remove the Remote Arc Starter Control Cable from the bulk-
head connection, J14, at the front panel of the Power Sup-
ply.
13. Turn the main power switch on the front of the Power Sup-
ply to ON.
14. Check for 36 VAC between pins 5 and 8 of the Torch Control
connector (J14) at the Power Supply bulkhead.
NOTE
Refer to the Power Supply Operating and Service
manuals for more details.
• If not present, problem is in the Power Supply.
• If present, check for open in Torch Supply Leads
Assembly signal wires.
15. If the Arc Starter PC Board 36 VAC red Indicator was
ON from the test in Step 5 or 9, place RUN/SET to
RUN position.
16. Press start and go through a start sequence. After pre-
flow the DC Indicator is ON. When the Power Supply
is activated and the DC Indicator is ON, there should
be greater than 220 VDC between the torch tip (+) and
electrode (-).
WARNING
High voltage (300-400vdc) is present in Remote
Arc Starter.
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 between
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 Remote Arc
Starter 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
symptoms of No Pilot.