Tweco A40-A60 CutMaster - Manual (Page 68)

CUTMASTER A40, A60
SERVICE Manual 0-5120 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. 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. 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. Turn off power to unit then 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 2.04.
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 indicator
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 PRESSURECONTROL
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 connect-
ed
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 ser-
vice 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.