MULTIQUIP DLW400ESA4 Operation Manuals page 60

WELDER-GENERATOR — TROUBLESHOOTING (CONT.)
Symptom
Welding current does not match preset
value.
PAGE 60 — DLW400ESA4 WELDER/GENERATOR • OPERATION MANUAL — REV. #0 (03/14/18)
Table 27. Troubleshooting (Welder-Generator)
Possible Problem
Welding regulator is tur ned
clockwise from constant current
position for welding?
Rotation speed of engine is low
due to overload or being out of
condition?
Semiconductor is overheated?
Solution
Adjust welding regulator to position at which
customer's welding work is easy. Constant
current position is adjusted to preset current
value, but if welding regulator is set to any
other position, drooping characteristic
appears.
Welding current may drop depending
upon diameter and length of welding
cable and may also vary depending upon
type, thickness, and arc length of welding
electrode. (Current variation is larger
as welding regulator is turned further
clockwise.)
Consider indicated preset current value as
standard at any position other than constant
current position.
When welding at maximum output, output
may be limited by overload if welding cable
diameter is too thin or welding cable length
is too long. Use cable within recommended
range for welding work.
If total output is overloaded when using AC
power and welding simultaneously, output
will be limited. Be careful not to cause an
overload.
If the side-door is open or exhaust vents
are clogged, causing insufficient cooling; if
semiconductors are heated at an over-duty
rate, output is limited to prevent such
overheating.