ESAB HandyPlasma 250, Instruction Manual

Page: 37 / 48

37
SECTION 5 TROUBLESHOOTING
The cause of control malfunctions can be found by referring to
the sequence of operations and electrical schematic diagram
and checking the various components. A volt-ohmmeter
will be necessary for some of these checks.
VOLTAGES IN PLASMA CUTTING EQUIPMENT ARE HIGH
ENOUGH TO CAUSE SERIOUS INJURY OR POSSIBLY DEATH.
BE PARTICULARLY CAREFUL AROUND EQUIPMENT WHEN
THE COVERS ARE REMOVED.
NOTE
Before checking voltages in the circuit, disconnect the power
from the high frequency generator to avoid damaging your
voltmeter.
5.1 TROUBLESHOOTING
ELECTRIC SHOCK CAN KILL! BE SURE THAT ALL PRIMARY
POWER TO THE MACHINE HAS BEEN EXTERNALLY DISCON-
NECTED. OPEN THE LINE (WALL) DISCONNECT SWITCH OR
CIRCUIT BREAKER BEFORE ATTEMPTING INSPECTION OR
WORK INSIDE OF THE POWER SOURCE.
Check the problem against the symptoms in the following
troubleshooting guide. The remedy may be quite simple. If
the cause cannot be quickly located, shut off the input power,
open up the unit, and perform a simple visual inspection
of all the components and wiring. Check for secure termi-
nal connections, loose or burned wiring or components,
bulged or leaking capacitors, or any other sign of damage
or discoloration.
Depress torch switch. After 2 seconds, is high frequency present?
No
Repair/replace
high frequency
unit
Repair/replace
power source
Yes
5.2 TROUBLESHOOTING GUIDE
A. Difficult Starting.
• Change electrode
• Change nozzle
• Check for good, clean connection of work lead to workpiece
• Check air pressure 65-70 psig (4.5 - 4.8 bar)
• Check torch power cable for continuity
Is the "Air" LED light on
Repair/replace
control PCB
Yes No
WARNING
WARNING