Trouble Shooting Guide - Lincoln Electric BESTER Magster 401 Operating Manual

Trouble Shooting Guide

Fault
Lack of the wire
feed /motor works/
Lack of the wire
feed /motor does
not work/
Irregular feed of the
electrode wire
Arc does not start
Too long or irregular
arc
Too short arc
After switching on
the idicator lamp
does not light
After switching on
the idicator lamps
light /contactor does
not switch on/
Cause
Shield runner of the electrode
wire is contaminated
Groove of the roll is not com-
patible to the wire diameter
Electrode wire is blocked into
the contact tip
Motor is damaged
The control pcb US-41A is da-
maged
Contact tip is damaged
Groove of roll is dirty, dama-
ged or it is not compatible to
the wire diameter
Lack proper contact of the
work clamp
Welding voltage is too high
Wire feeding speed is too low
Welding voltage is too low
Wire feeding speed is too high
Lack of supply voltage
Damaged switch
Damaged idicator lamp
Thermal protection works
Remedy
Clean the shield runner of the
electrode wire
Use the roll with the groove
according to the wire diameter
Unblock the electrode wire in-
to the contact tip
The machine should be given
to the service back
The machine should be given
to the service back
Change the contact tip for
the new one
Clean the groove of the roll
or change it according to the
wire diameter
Straighten contact of the work
clamp
Decrease the welding voltage
Increase the wire feed speed
Increase the welding voltage
Increase the wire feed speed
Connect supply voltage
Change the switch
Change the bulb
Chill the machine
Strona 37