Fault Finding - NewArc Mig500 Operational Manual

4. Fault finding

Machine Operation Problems
Most problems with the MIG400 can be overcome by following the procedures below.
No Digital Display on switch on
• Check that the machine is attached to a working mains supply that it is correctly plugged in and any
isolator switches are closed.
• Check the condition of the 2A fuse on the rear panel of the machine and replace if necessary.
Note! Make sure the fuse is replaced with one of the correct type and rating. It should be a 32 x 6.3mm
(1¼" x ¼") ceramic bodied type with a rating of 2A 'slow blow'
• Have a competent electrician check that there are no mains fuses or overload devices interrupted, that
the mains plug is fitted correctly and that there are no loose wires or connections, check that there are
no breaks in the mains cable.
Digital display lit but no output
• Make sure that the display is not reading 'OT' , if it is, it means that the R4000/R5000 has overheated,
normally by exceeding its 'Duty Cycle' , and the power stages of the machine have been shut down.
In this case, leave the machine switched on until it has cooled down, if you turn the machine off, the
cooling fans will be turned off also and the cooling down period will be lengthened considerably.
Note! If the R4000/R5000 is overheating on a regular basis or at current settings below the maximum,
this would usually indicate that the inside of the machine is choked with dust and therefore not being
cooled correctly. For information about cleaning the dust out of the R4000/R5000 please refer to the
three monthly service schedule.
MIG Unit is not working
• Check the condition of the 6.3A fuse on the rear panel of the machine and replace if necessary.
Note! Make sure the fuse is replaced with one of the correct type and rating. It should be a 20 x 5mm
glass bodied type with a rating of 6.3A 'slow blow' . Any welding problems not covered above must be
brought to the attention of a qualified Welding Engineer, if the problem still persists have the R4000/
R5000 checked by a trained Newarc service engineer.
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MIG 500