Poor Cut Quality; No Pilot Arc; No Arc Transfer; No Preflow - ESAB Precision Plasmarc IEFC-S PT-24 Installation, Operation And Maintenance Manual

SECTION 6

6.2.2 Poor Cut Quality

6.2.3 No Pilot Arc

Insufficient spark gap setting

6.2.4 No Arc Transfer

N

6.2.5 No Preflow

Emergency stop signal open Check for continuity between TB3-18 and TB3-19

6.2.6 Torch Fails To Fire

Faulty cooling water flow switch
Bad (open) Pilot Arc Cable Replace Cable
Contaminated Electrode Clean or replace electrode
in plumbing box.
Torch negative lead open No open circuit voltage
Pilot Arc Contactor (PAC)
malfunctioning
Cutting current
setting too low.
Torch too high
above workpiece
Work lead not
connect to cutting table
or O check valve in torch
2 2
body may be stuck open
Cooling Water Flow Switch
No Cooling Water Check reservoir. Add coolant until full.
Start Gas Lower start gas flow
Cooling water Flow Pump pressure too low. Should be 115 psi.
(CWFS)
Obstruction in torch
limiting cooling water flow
PT-24 Precision Plasma System IEFC-S
TROUBLESHOOTING
See Cut Quality In Section 4
Set spark gap to 0.040"
Replace contactor
Raise cutting current (see Process Data)
Lower torch standoff (see Process Data)
Ensure work lead is firmly connected to workpiece
or cutting table
See maintenance section for check valve repair.
Check cooling water LED on front panel. Should be
lit if switch is open
Replace CWFS switch
Coolant flow through torch should be greater than
0.375 (3/8) gal/min
6-3