Tweco N7500 - Manual (Page 50)

TROUBLESHOOTING GUIDE 8-2 Manual 89250890
N7500 TROUBLESHOOTING GUIDE
General
Problem Possible Cause Possible Remedy
N7500 starts
operation but
Torch Head
stops
Low voltage shutdown
DC voltage has dropped below 28 volts. Determine cause
of voltage drop, take corrective action, and restart the
system.
Electrical Arc
at Power sup-
ply, Control
Box or Torch
Head Buss Bar
Improper wiring connections
Confirm proper wiring, check for damage to components,
repair or replace.
Table 8-1: General Troubleshooting
8.03 Torch Head
PIN # WIRE COLOR
A EMPTY
B RED
C BLACK
D EMPTY
E GREEN
F BLUE
Table 8-2: Torch Head Motor 6 PIN Wire Schedule
Torch Head
Problem Possible Cause Possible Remedy
No air or little
air from Torch
Head nozzle
See "No air flow through Control
Box when system is activated" in
Control Box Troubleshooting
Shop air issue
Check Shop air.
Control Box to Torch Head air line
kinked
Remove kink in air line.
Ports in Torch Head nozzle are
clogged
Clean slag from Torch Head nozzle.
White nozzle insulator ring on air
nozzle missing or destroyed
Replace with new nozzle insulator ring. See Item number
"27" in "Table 9-4: Torch Head PARTS" on page 9-2.
Electrode
does not feed
through Torch
Head
Torch Head motor not operating
See "8.04 Remote Pendant" Troubleshooting sec-
tion.
Check Motor cable connectors. Repair or replace cable.
See "SYSTEM CABLES" on page 9-4.
Check Motor. See "Figure 9-3: Torch Head PARTS" on
page 9-2.
Joint separated
or
Electrode stub jammed inside
housing
Realign electrodes or replace damaged electrode.
Shut N7500 down, disconnect Torch Head from Control
Box, open housing cover plate and remove electrode. See
"Figure 9-3: Torch Head PARTS" on page 9-2.
Electrode release lever jammed
open
Remove electrode(s) from Torch Head, inspect release le-
ver, repair or replace. See "Figure 9-3: Torch Head PARTS"
on page 9-2.