False-Positive Torch Contact - ABB SmarTac Applications Manual

5.3 False-positive torch contact

Description
An error message appears on the screen stating that the torch has made contact
with the part, before searching has begun, but the torch is clearly not touching the
part. Or an activation error message appears on the screen.
Possible causes
Application manual - SmarTac
3HAC024845-001 Revision: A
1 If the torch is a fluid-cooled gun, check that the coolant is non-conductive.
If it is not, flush the system with de-ionized water and replace with new
coolant. Never use tap water or automotive coolant.
2 If a secondary contactor or "positive lead break box" is present, check to
see that it is working properly. The positive welding lead should be open
when doSE_SENSOR is turned on. If the output to switch the contactor is
working correctly, but the contactor is not working, repair or replace the
secondary contactor or "positive lead break box". If the output to the contactor
is not present, inspect the SmarTac wiring per the prints in section Electrical
Reference in the SmarTac hardware manual.
3 Check the continuity of the torch between the contact tip and the gas cup.
Resistance should be greater that 10Kohms. If not, check that the gas cup
and gas diffuser are cleaned well. If there is still a short, replace the torch.
4 Check that the welding wire is not making contact with earth potential at any
point.
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5 Trouble shooting
5.3 False-positive torch contact
77