Thermal Arc 250TS DC CC, Operating Manual

Page: 45 / 57

45
Description Possible Cause Remedy
5 Gas flow won’t
shut off
A Weld Mode ( STD , SLOPE ,
REPEAT or SPOT ) was
changed before POST-FLOW
gas time had finished.
A Strike an arc to complete the
weld cycle.
OR
Switch machine off then on to
reset solenoid valve sequence.
B Gas valve is faulty. B Have an Accredited Thermal
Arc Service Agent replace gas
valve.
C Gas valve jammed open. C Have an Accredited Thermal
Arc Service Agent repair or
replace gas valve.
D POST-FLOW control is set to
60 sec.
D Reduce POST-FLOW time.
6 The TIG electrode
has been
contaminated due
to the gas flow
shutting off before
the programmed
POST-FLOW time
has elapsed
The Weld Process Mode
(STICK, HF TIG or LIFT
TIG) was changed before
POST-FLOW gas time had
finished.
Do not change Weld Process
Mode before the
POST-FLOW
gas time had finished.