Arc Machines 205 WDR - Manual (Page 55)

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O P E R A T O R ’ S M A N U A L
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If there is no problem with the source or with the hoses and their connections then an
internal failure of the flow switch, solenoid or internal hosing is possible. Contact an
AMI Service representative.
• ARC VOLTS LOW or STUB OUT - this fault will only occur when an arc is present and
will no longer exist when the arc goes out. If the arc voltage gets too low (below 5 volts)
or the electrode should touch the weld puddle an ARC VOLT fault will occur. This
creates an ALL STOP condition and does not actuate the RETURN TO HOME function
after Postpurge.
• ARC VOLTS HIGH - if the arc voltage is too high (above 20 volts) during a weld
sequence this fault will occur. It usually occurs if a hole is made in the weld, causing
the arc to wander over to the far side of the hole. The most common cause of this is
either poor tube fit-up or excessive gas pressure inside the tube causing the weld to
blow out and create a hole.
• BAD START - if for any reason the Model 205 cannot establish a stable arc at the end
of Prepurge the system will display a BAD START fault. There can be several reasons
for this to occur. The most common are poor ground or electrode connections,
contaminated gas or a contaminated electrode. Another common cause of a BAD
START is too short of a Prepurge time. This is especially true when a system or
weldhead is being used for the first time in a shift. While it sits unused atmosphere can
propagate into the cables. Before performing the first weld of a shift, use the Manual
Purge for a minute or two to initially clear the gas lines.
Note
AMI recommends 2% Ceriated welding electrodes. They have proven to be much
more effective than 2% Thoriated electrodes for RF transmission and are reported to
have longer life than 2% Thoriated Electrodes.
Note
There are no user serviceable components located inside the Model 205. Do not open
the unit in an attempt to repair it. Contact Arc Machines if the unit is malfunctioning or
suspected of being broken. As such no wiring diagram or internal circuit drawing is
provided.