Tweco TD-750 Cutting Systems - Manual (Page 22)

SERVICE 18 Manual 0-2475
• If voltage is less than 220 VDC proceed to Step 18.
18. In the Power Supply measure the voltage at the torch
bulkhead in the Power Supply (marked + and -).
• If greater than 220 VDC check for open connections
through the Power Supply connections, Torch
Leads Extension 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.