Fault Finding - NewArc R7000 Operational Manual

4. Fault finding

Most problems with the R7000 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 'HOT' , if it is, it means that the R7000 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 R7000 is overheating on a regular basis or at current settings below the maximum, this
would usually indicate that the rear grill filter and/ or the inside of the machine is choked with dust
and therefore not being cooled correctly. For information about cleaning the dust out of the R7000
please refer to the relevant part of manual in 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. (Positive to positive, negative to negative).
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 R7000
checked by a trained Newarc service engineer.
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R7000