Tweco 400 MST Arc Master - Manual (Page 46)

400MST
9
ADVANCED TROUBLESHOOTING
9 – 9
• Confirm the pin-out numbers of the 14-pin
receptacle (or 19-pin receptacle) located on
the wire feeder equipment. (Refer to section
3.1
.)
• Confirm the wiring and connections on the
14-pin receptacle (or 19-pin receptacle)
located on the wire feeder equipment.
c) Verify the circuit breaker used for the wire
feeder equipment power supply, MCB1 and
MCB2.
• Confirm whether MCB1 or MCB2 has tripped
or not. (When the MCB trips, the yellow knob
will be exposed.)
NOTE
If the circuit breaker of the wire feeder power sup-
ply has tripped, there are other possible failures
that must be considered. For example, the capacity
of the wire feeder equipment motor is large, or
there are some other problems in the wire feeder
equipment. Before continuing onto the next sec-
tion, verify and eliminate the above possible failure
conditions. Refer the operating manual supplied by
the wire feeder manufacture.
• Press the yellow knob down AFTER the
faults in the wire feeder equipment are
resolved.
• If the wire feeder equipment still does not
operate, verify MCB1 and MCB2. Replace
them if necessary.
• Refer to section 9.2.4.27 for the replacement
of MCB1 and MCB2.
d) Verify the transformer, T1, and replace it if nec-
essary.
• Refer to section 9.2.4.29 for the replacement
of T1.
e) Verify the wire feeder equipment, and replace
it if necessary.
• Refer to the operating manual supplied by the
wire feeder manufacture before any work is
performed on the wire feeder.
1.3.3 "No weld output"
Cause
Occurs when the 14-pin receptacle (19-pin recep-
tacle) or associated circuitry is defective, dam-
aged, or the TIG torch cable is defective and Wire
feeder Abnormality.
Verification/Remedy
CAUTION
Read and understand this entire section before
proceeding. Extreme personal harm and test
equipment damage will occur if the procedures are
not performed accurately.
a) Verify the 14-pin receptacle. * Applies to LIFT
TIG and MIG mode.
• Confirm a secure connection between CON1
of the 14-pin receptacle and the wire feeder.
• Confirm a secure connection between CON1
of the 14-pin receptacle and the remote
device.
• Confirm a secure connection of the harness
and the connections between CON1 and
PCB17 (WK-5699) are all correct and there
are no open circuit.
• Contact the manufacturer if you find any bro-
ken connectors or damaged wiring har-
nesses.
• Confirm the proper pin-outs of the 14-pin
receptacle on the wire feeder side. (Refer to
section 3.1
.)
• Confirm the proper pins-outs of the 14-pin
receptacle on the remote device side. (Refer
to section 3.1.)
• Confirm that the wire feeder has no open
circuit on the 14-pin receptacle at the remote
device side.
b) Verify the condition and connect the connec-
tions of the welding cable, the stick rod holders
and the base metal cables. * Applies to STICK
and LIFT TIG mode.
• Confirm a secure connection of the welding
cable, stick rod holders, base metal cables
and dinse connectors and there are no open
circuits.
c) Verify the cables connected to the wire feeder
equipment including welding and base metal
cables. * Applies to MIG mode only.