ESAB Precision Plasmarc, Installation, Operation And Maintenance Manual For Residential Installation

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SECTION 6 TROUBLESHOOTING
6-4
6.3.2 Poor Cut Quality
See Cut Quality In Section 4
6.3.3 No Pilot Arc
Contaminated Electrode
Contaminated Electrode Contaminated Electrode
Contaminated Electrode Clean or replace electrode
Insufficient spark gap setting
Insufficient spark gap setting Insufficient spark gap setting
Insufficient spark gap setting
in plumbing box. in plumbing box. in plumbing box. in plumbing box.
Set spark gap to 0.040”
Pilot Arc Contactor (PAC) Pilot Arc Contactor (PAC) Pilot Arc Contactor (PAC) Pilot Arc Contactor (PAC)
malfunctioning malfunctioning malfunctioning malfunctioning
Replace contactor
6.3.4 No Arc Transfer
Cutting current Cutting current Cutting current Cutting current
setting too low. setting too low. setting too low. setting too low.
Raise cutting current (see Process Data)
Torch too high Torch too high Torch too high Torch too high
above workpiece above workpiece above workpiece above workpiece
Lower torch standoff (see Process Data)
Work lead not Work lead not Work lead not Work lead not
connect to cutting table connect to cutting table connect to cutting table connect to cutting table
Ensure work lead is firmly connected to workpiece
or cutting table
N N N N
2 2 2 2
or O or O or O or O
2 2 2 2
check valve in torch check valve in torch check valve in torch check valve in torch
body may be stuck open
body may be stuck open body may be stuck open
body may be stuck open
See maintenance section for check valve repair.
6.3.5 No Preflow
No start signal No start signal No start signal No start signal Check input 0 LED on PLC. Should be lit. This
verifies a start command has been given
Emergency stop signal open Emergency stop signal open Emergency stop signal open Emergency stop signal open Check for continuity between TB3-18 and TB3-19
Shorted, closed or Shorted, closed or Shorted, closed or Shorted, closed or jumpered out jumpered out jumpered out jumpered out
Cooling Water Flow Switch
Cooling Water Flow Switch Cooling Water Flow Switch
Cooling Water Flow Switch
Check cooling water LED on front panel. Should be
lit.
No Cooling Water No Cooling Water No Cooling Water No Cooling Water Check reservoir. Add coolant until full.
6.3.6 Torch Fails To Fire
Start Gas Start Gas Start Gas Start Gas Lower start gas flow
Cooling water Flow Cooling water Flow Cooling water Flow Cooling water Flow Pump pressure too low. Should be 115/130 psi.
Faulty cooling water flow switch Faulty cooling water flow switch Faulty cooling water flow switch Faulty cooling water flow switch
(CWFS)
(CWFS) (CWFS)
(CWFS)
Replace CWFS switch
Obstruction in torch Obstruction in torch Obstruction in torch Obstruction in torch
limiting cooling water flow
limiting cooling water flow limiting cooling water flow
limiting cooling water flow
Coolant flow through torch should be greater than
0.5 gal/min