Elettro CF 492 Spare Parts page 13

E) If pilot arc turns on, but as it approaches to the
workpiece to be cut the machine stops and the pilot
lamp signalling "electrode exhausted" lights up even
with a new electrode, ensure:
that connection (pos.77 of the exploded view) is
−
firmly fastened and not discontinued in terms of
electricity (only art. 496).
that the solenoid valve is efficient and appropriately
−
supplied. For verifications see point H).
that the high-tension circuit and the control circuit are
−
efficient.
F) If the torch arc turns on but then turns off again
when the torch is approached to the workpiece, verify:
that the workpiece is efficiently grounded.
−
that the control circuit is efficient.
−
G) If the machine equipped with torch P50 does not set
full-scale setting at 50 A, verify (only for art. 496):
that contacts b and c of torch part adapter are short-
−
circuited.
that governing board or its connections are efficient.
−
H) If the electrode and the nozzle wear too quickly or
cut quality is poor, ensure:
that the solenoid valve is efficient and appropriately
−
supplied.
Correct supply only occurs during cutting as the above
mentioned solenoid valve is only supplied under those
conditions.
If this is not the case, replace the control circuit after
verifying the continuity of the connections.
The efficiency of the solenoid valve is usually tested
observing the gauge pointer that has a slight movement
towards lower pressure values when the solenoid valve
is triggered, or also feeding it separately with outside
voltage.
13