Tweco 6045 Excel Arc - Manual (Page 37)

SERVICE EXCEL ARC 6045
August 26, 2011 5-5 Manual 0-5213
For LOCAL VOLTAGE or CURRENT control:
2. LOCAL / REMOTE SWITCH (SW4) is set in REMOTE
position.
a. Switch SW4 to LOCAL position.
For REMOTE VOLTAGE or CURRENT control:
2. Remote potentiometer or cable is open.
a. Check continuity.
D. Welding Arc will not transfer.
1. Defective Positive or Negative output cables.
a. Check continuity.
2. Work cable not connected or poor connection to work.
a. Check / clean connections.
E. Poor weld performance.
1. Incorrect polarity.
a. Verify welding cable polarity is correct for the
welding mode and application requires.
5.08 Troubleshooting STICK (SMAW /
CAG) Mode Problems
A. ON / OFF INDICATOR is ON. No arc can be
established. OUTPUT on INDICATOR is OFF.
1. Defective control board.
a. Replace control board.
2. Defective remote OUTPUT ENABLE (START) switch or
cable.
a. Check continuity.
B. OUTPUT ON INDICATOR is ON but there is no
output voltage from the unit.
1. Take unit to Authorized Service Facility.
C. Hard or intermittent starting of the arc.
1. Insuffi cient output current.
a. Increase OUTPUT VOLTAGE /CURRENT
POTENTIOMETER (R1) to higher setting.
2. HOT START SWITCH (SW3) is in OFF position.
a. Switch SW3 to ON position.
3. Insuffi cient HOT START amperage or duration.
a. Adjust HOT START current level and/or duration
trimpots.
4. Electrodes sticking to work piece. ARC FORCE
CONTROL POTENTIOMETER (R2) is set too low.
a. Increase R2 setting.
5.09 Troubleshooting TIG (GTAW) Mode
Problems
A. ON /OFF INDICATOR is ON. OUTPUT ON
INDICATOR is OFF. No output.
USING REMOTE CONTROL SWITCH FOR OUTPUT
ENABLE CONTROL:
1. Defective remote OUTPUT ON (CONTACTOR ON)
switch.
a. Check switch continuity.
2. Remote control cable is open.
a. Check for continuity between J1 plug pins A &
B with remote switch closed.
B. OUTPUT ON INDICATOR is ON but there is no
output voltage from the unit.
1. Take unit to an Authorized Service Facility.
5.10 Troubleshooting MIG (GMAW /
FCAW) Mode Problems
A. ON /OFF INDICATOR is ON. OUTPUT ON
INDICATOR is OFF. No output.
1. No remote OUTPUT ENABLE (CONTACTOR ON) signal.
a. Verify Start signal to J1 plug from feeder. (1 of
four possible signals.)
i) Contact closure between pins A & B.
ii) Contact Closure between pins R & S.
iii) Contact closure between pins D & E.
iv) Contact closure between pins P & R.
2. Circuit Breaker Tripped.
a. Check/Reset CB3,CB4,CB5.
B. OUTPUT ON INDICATOR is ON but there is no
output voltage from the unit.
1. Take unit to an Authorized Service Facility.