Thermal Dynamics cutmaster A60, Service Manual

Page: 95 / 148

CUTMASTER A60
Manual 0-4982 5-11 SERVICE
G. TRIGGER LOCKED DURING POWER UP
FAULT. The FAULT Indicator and 75 PSI
LED is flashing.
1. Start signal is active when SW1 is turned to ON
position.
a) 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. Problem in the torch and leads switch circuit
a) Check continuity of torch switch circuit at ATC
pins 3 & 4. See previous illustration.
3. Short in CNC cable
a) Check continuity
4. Defective Logic PCB (PCB 3)
a) Measure voltage at Main PCB between J2-16
to test point GND1 for 12VDC. If voltage is
present, replace Logic PCB
5. Defective Main PCB
a) Replace Main PCB.
H. TIP MISSING FAULT. The FAULT Indicator
and 80 PSI LED is flashing. Gas solenoid
cycles ON and OFF.
1. Torch Shield Cup is loose.
a) Tighten shield cup by hand. Do not over
tighten.
2. Torch tip, electrode, or starter cartridge missing.
a) Turn OFF power supply. Replace missing
part(s).
3. Starter Cartridge is stuck.
a) Turn OFF power supply. Bleed down the sys-
tem. Remove the shield cup, tip,start cartridge
and electrode. Check the lower end unit of the
start cartridge for free movement. Replace the
cartridge if the lower end unit does not move
freely.
Art # A-08064_AC
Spring-Loaded
Lower End Fitting
Full Compression
Spring-Loaded
Lower End Fitting at Reset /
Full Extension
4. Open conductor in torch leads
a) Check continuity
5. Defective Main PCB
b) Measure voltage at Main PCB between J2-2
to test point GND1 for 12VDC. If voltage is
present, replace Main PCB
6. Defective Logic PCB
a) Replace Logic PCB
I. AC LED ON, yellow TEMP LED is ON, red
FAULT Indicator is flashing.
1. Air flow through unit is restricted
a) Provide adequate airflow. See Ventilation
Clearance Requirements section 2.04.
2. Exceeded duty cycle of the power supply.
a) Allow unit to remain on, but at idle, with fan
running to cool power supply. See Power Sup-
ply Specifications section 2.04 for duty cycle
information.
3. Fan(s) not turning
a) Measure voltage at plug between J7-1 to J7-2
and between J81 to J8-2 on Main PCB for
12VDC If voltage is present replace fan.
4. Defective Main PCB
a) Measure voltage at plug between J7-1 to J7-2
and between J8-1 to J8-2 on Main PCB for
12VDC. If voltage is missing at either recep-
tacle, replace Main PCB.
5. Defective Logic PCB
a) Replace Logic PCB