Tweco 300 DC Arcmaster - Manual (Page 58)

ARCMASTER 300 ACDC
10-8 February 22, 2006
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 repair or
replace the gas valve
C Gas valve jammed open. C Have an Accredited Thermal
Arc Service Agent repair or
replace the 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.
A
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.
Table 10-3 (continued): Power Source Problems