Section 5 - Fault Finding And Maintenance; Mig Welding Problems - NewArc R5000 CCCV Instruction Manual

SECTION 5 — FAULT FINDING AND MAINTAINANCE
5.1 Machine Operation Problems
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
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mains supply that it is correctly plugged in and any
isolator switches are closed.
Check the condition of the 2A fuse on the rear
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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, nor-
mally 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 cool-
ing 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 cor-
rectly. For information about cleaning the dust out of
the R4000CC/R5000CC please refer to the relevant part
of section 5.3.2, the three monthly service schedule.
TIG unit is not working.
Check the condition of the 6.3A fuse on the rear
•
panel of the machine and replace if necessary.
Check interconnection cables are correctly fitted.
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(Positive to positive, negative to negative).3
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 cor-
rect 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 prob-
lem still persists have the R4000/R5000 checked by a trained
New-Arc service engineer.
.
5.2 Welding Problems
MMA
If problems with the R4000/R5000's operation while welding
are experienced, first refer to the information in paragraph
3.2 in the installation section and paragraphs 4.3.1 and 4.3.2
in the operating section and the fault finding procedure ear-
lier in this section.
Most problems with MMA welding are the result of not
•
setting the correct welding parameters for the welding
rod being used. All welding rod packets have informa-
tion on them in symbolic format , giving suitable current
range, polarity and type of weld (normally called
'position'). If you are in doubt about what these symbols
mean, ask your welding rod supplier to explain them.
Choose an initial current setting towards the middle of
the quoted range and if necessary practice on a piece
of scrap the same thickness as the job to be welded.
TIG
If problems are experienced whilst TIG welding, please
•
consult the fault finding and maintenance section in the
TIG unit 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 have the R4000/R5000
checked by a trained New-Arc service engineer.
•
MIG
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 Engineer, if the prob-
lem still persists have the R4000/R5000 checked by a trained
New-Arc service engineer.
R5/4000 CCCV
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