Poor Cut Quality; No Pilot Arc; No Arc Transfer; No Preflow - ESAB Precision Plasmarc Installation, Operation And Maintenance Manual For Residential Installation

SECTION 6

6.3.2 Poor Cut Quality

6.3.3 No Pilot Arc

6.3.4 No Arc Transfer

6.3.5 No Preflow

Shorted, closed or jumpered out Shorted, closed or
Shorted, closed or Shorted, closed or

6.3.6 Torch Fails To Fire

Faulty cooling water flow switch Faulty cooling water flow switch Faulty cooling water flow switch Faulty cooling water flow switch
Contaminated Electrode Contaminated Electrode Contaminated Electrode Clean or replace electrode Contaminated 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.
Pilot Arc Contactor (PAC) Pilot Arc Contactor (PAC)
Pilot Arc Contactor (PAC) Pilot Arc Contactor (PAC)
malfunctioning malfunctioning
malfunctioning malfunctioning
Cutting current Cutting current
Cutting current Cutting current
setting too low. setting too low. setting too low. setting too low.
Torch too high Torch too high Torch too high Torch too high
above workpiece above workpiece above workpiece above workpiece
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
N N N N or O or O check valve in torch check valve in torch
or O or O check valve in torch check valve in torch
2 2 2 2 2 2 2 2
body may be stuck open body may be stuck open
body may be stuck open body may be stuck open
No start signal Check input 0 LED on PLC. Should be lit. This No start signal No start signal No start signal
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
jumpered out
jumpered out jumpered out
Cooling Water Flow Switch Cooling Water Flow Switch
Cooling Water Flow Switch Cooling Water Flow Switch
No Cooling Water Check reservoir. Add coolant until full. No Cooling Water
No Cooling Water No Cooling Water
Start Gas Lower start gas flow Start Gas Start Gas Start Gas
Cooling water Flow Cooling water Flow
Cooling water Flow Cooling water Flow
(CWFS) (CWFS)
(CWFS) (CWFS)
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
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.
verifies a start command has been given
Check cooling water LED on front panel. Should be
lit.
Pump pressure too low. Should be 115/130 psi.
Replace CWFS switch
Coolant flow through torch should be greater than
0.5 gal/min
6-4