Tweco Hefty II CC CV Voltage Sensing Wire feeder - Manual (Page 29)

3. Input Current Protection - If the input current
rises above the specified maximum input cur-
rent for an extended period of time, the input
circuit breaker will trip, and the wire feeder
will not operate. The input circuit breaker will
have to be manually reset if it were to trip.
4. Motor Overcurrent Protection - If the drive
motor becomes locked or shorted, an elec-
tronic circuit will activate, and the motor will
not operate. If this circuit activates, a light on
the motor control printed circuit board labeled
“Fault 2" will turn on (See Figure 5-2). The
motor overcurrent protection circuit will have
to be manually reset by placing the power
switch on the wire feeder in the off position
for at least 60 seconds.
CAUTION: If this protection circuit
activates and the drive motor is
not locked, the drive motor is most
likely shorted and will have to be
replaced (See “Troubleshooting
Guide” section of this manual).
5. Contactor And Gas Valve Overcurrent Pro-
tection - If the contactor or gas valve be-
comes shorted, an electronic circuit will
activate, and both the contactor and gas
valve will not operate. If this circuit activates,
a light on the 12 VDC driver printed circuit
board labeled “Fault 1" will turn on. The con-
tactor and gas valve overcurrent protection
circuit will have to be manually reset by plac-
ing the power switch on the wire feeder in the
off position for at least 60 seconds.
CAUTION: If this protection circuit
activates, the contactor or gas
valve is most likely shorted and
one or both will have to be re-
placed (See “Troubleshooting
Guide" section of this manual).
R46
WIRE FEED SPEED (WFS)
ADJUSTMENT
R68
BURNBACK ADJUSTMENT
R2 (-)
R12 (+)
CR14
FAULT 2 LED
Figure 5-2 Motor Control Printed
Circuit Board
430429-456
OPERATION
5-4 November 17, 1999