Tweco A80-A120 CutMaster - Manual (Page 76)

CUTMASTER A80, A120
SERVICE Manual 0-5119
5-4
5.05 Basic Troubleshooting Guide
WARNING
There are extremely dangerous voltage and power levels present inside this unit. Do not attempt to diagnose or
repair unless you have had training in power electronics measurement and troubleshooting techniques.
Problem-Symptom Possible Cause Recommended Action
ON / OFF Switch
is ON but the A/C
Indicator does not
light
1. Primary power disconnect is in
OFF position.
2. Primary fuses / breakers are
blown or tripped.
3. Units internal fuse blown.
4. Faulty components in unit.
1. Turn primary power disconnect switch to ON position.
2. a) Have qualified person check primary fuses / breakers.
b) Connect unit to known good primary power receptacle
3. a) Replace fuse.
b) If fuse blows again, return to authorized service center for
repair or replacement.
4. Return to authorized service center for repair or
replacement.
Fault indicator
flashing, 65 PSI
indicator flashing
1. INPUT VOLTAGE SELECTION
SWITCH set for incorrect
voltage.
2. Primary input voltage problem.
3. Faulty components in unit.
1. Set INPUT VOLTAGE SELECTION SWITCH to match primary
input voltage.
2. Have qualified person check primary voltage to insure it
meets unit requirements see section 2.05.
3. Return to authorized service center for repair or
replacement.
TEMPERATURE
indicator ON.
FAULT indicator
flashing.
1. Air flow through or around the
unit is obstructed.
2. Duty cycle of the unit has been
exceeded
3. Failed components in unit
1. Refer to clearance information – section 2.04
2. Allow unit to cool.
3. Return to authorized service center for repair or
replacement.
GAS LED OFF,
FAULT and MIN
pressure indicators
flashing.
1. Gas supply not connected to
unit.
2. Gas supply not turned ON.
3. Gas supply pressure too low.
4. AIR PRESSURE CONTROL
regulator set too low.
5. Failed components in unit.
1. Connect gas supply to unit.
2. Turn gas supply ON.
3. Set air supply inlet pressure to unit to 120 psi.
4. Adjust regulator to set air pressure - see section 4.02.
5. Return to authorized service center for repair or
replacement.
FAULT and 70 PSI
indicators flashing.
1. Shield Cup loose.
2. Torch not properly connected
to power supply.
3. Problem in torch and leads PIP
circuit.
4. Failed components in unit.
1. Hand tighten the shield cup until it is snug.
2. Insure torch ATC is securely fastened to unit.
3. Replace torch and leads or return to authorized service
center for repair or replacement.
4. Return to authorized service center for repair or
replacement.
FAULT and 75 PSI
indicators flashing.
1. Start signal is active when
ON/OFF SWITCH is turned to
ON position.
2. Problem in the torch and leads
switch circuit.
3. Failed components in unit.
1. Start can be active for one of the following:
• Hand torch switch held closed
• Hand pendant switch held closed
• CNC START signal is active low Release the START signal
source
2. Replace torch and leads or return to authorized service
center for repair or replacement.
3. Return to authorized service center for repair or
replacement.