Troubleshooting - Praxair SELECT-400 Manual De Instrucciones Y Lista De Repuestos

The most frequent problems are given below. If the problem is different, please consult the PRAXAIR SOLDADURA S.L.
technical service. Always use original spares from the machine manufacturer, PRAXAIR SOLDADURA S.L. If different
components are used, these could damage the machine or adversely affect its performance.
FAULT
Low open circuit voltage
The ventilator does not
work
Poor welding current
Gas holes in weld
Lack of penetration
Spatter

TROUBLESHOOTING

LIKELY CAUSE
Blown line fuses.
Ø
Blown primary fuse
Ø
Faulty motor
Ø
Cut or loose ventilator power cables
Ø
2 or 4 A fuses blown
Ø
Loss in the cables
Ø
Faulty wire feed
Ø
Insufficient shielding gas flow
Ø
Welded part is rusty or dirty.
Ø
Moisture present in gas
Ø
Irregular position of torch
Ø
Very low voltage
Ø
Too large a margin
Ø
Irregular wire feed
Ø
Excessive projection
Ø
very high voltage
Ø
dirt or spatter on tip
Ø
insufficient inductance
Ø
too much angle on torch
Ø
SOLUTION
> Measure the 3 line phases
>
Change fuses
> measure the voltage of the motor
cables. If it is 230 V the motor is
faulty.
>
Change fuses.
>
Tighten connections
>
Lessen the wire feed roller pressure.
> Clean the torch tip
> Clean the rollers or change them if
faulty.
> Reduce the feed speed.
> Increase the arc voltage.
> Increase the arc voltage
>
Reduce the arc voltage
> Clean or change the tip
> Change the earth connection to
max. ind.