R5/4000 CV
8
SECTION 5 — FAULT FINDING AND MAINTAINANCE
5 Fault finding and maintenance
5.1 Machine operation
Most problems with the R4000/R5000 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 inter-
rupted, 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 over-
heated, 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 lengthening the cooling down period
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 be-
ing cooled correctly. For information about cleaning the dust out of the R4000/R5000 please refer to
the relevant part of section 5.3.2, 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’.
5.2 Welding Problems
•
If problems are experienced whilst MIG welding, please consult the fault finding and maintenance section of
the WFU instruction manual.
Any welding problems not covered above must be brought to the attention of a qualified Welding Engi-
neer, if the problem still persists the R4000/R5000 should be checked by a trained Newarc service engi-
neer.
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