Thermal Dynamics Cutmaster 82, Service Manual

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cutmaster 82
Manual 0-4980 5-15 SERVICE
M. AC LED on, TEMP LED off, GAS LED on,
Gas does not flow in SET mode using a
hand torch or a machine torch without
remote solenoid.
1. Defective gas solenoid (SOL1)
a) Measure voltage on Main Pcb between J5-1 to
J5-3 for 12 VDC. If voltage is present, change
SOL 1
2. Defective Logic Pcb
a) Measure on Main PCB between J2-12 to test
point GND1 for 12VDC. If voltage is present,
replace Main PCB.
3. Defective Main PCB
a) Replace Main PCB
N. AC LED on, TEMP LED off, GAS LED on,
Gas does not flow in SET mode using a
machine torch with remote solenoid.
Disconnect the gas solenoid SOL1 from the back of
the ATC connector.
If Gas DOES NOT flow out of SOL1 when the unit is
in SET mode :
1. Defective gas solenoid (SOL1)
a) Measure voltage on Main PCB between J5-1 to
J5-3 for 12 VDC. If voltage is present, change
SOL 1
2. Defective Logic PCB
a) Measure on Main PCB between J2-12 to test
point GND1 for 12VDC. If voltage is present,
replace Main PCB.
3. Defective Main PCB
a) Replace Main PCB
If gas DOES flow out of SOL1 when the unit is in SET
mode, reconnect SOL1 to the ATC connector.
4. Defective torch solenoid.
a) Measure the coil terminals of the torch mounted
gas solenoid SOL2 for 24vac. If present, re-
place SOL2.
5. Defective Main PCB
a) Measure on Main PCB between J2-20 to GND1
for less than 2VDC.
If voltage is 12VDC replace Main PCB
b) Measure on Main PCB between J2-11 to GND1
for less than 2VDC. If voltage is less than
2VDC replace Main PCB
6. Defective Logic PCB
a) Measure on Main PCB between J2-11 to GND1
for less than 2VDC. If voltage is 12vdc, replace
Logic PCB.
O. Cannot adjust gas pressure in the SET
mode
1. Inlet gas pressure is too low
a) Increase inlet gas pressure to 95-120 psi
2. Faulty regulator
a) Replace Regulator
5.09 Pilot Arc Problems
A. AC LED on, TEMP LED off, GAS LED on.
Nothing happens when torch switch or
remote switch is closed ( Or CNC START
signal is active) No gas flow, DC LED OFF.
1. Problem in the torch and leads switch circuit (or
remote pendant or CNC signal missing
a) For hand torches, Check continuity of torch
switch circuit at ATC pins 3 & 4.
Negative / Plasma Lead
4 Torch Switch
3 Torch Switch
2 PIP
1 PIP
Pilot Lead
Art # A-08124
b) For machine torches using a remote pendant,
Check continuity of Pendant switch circuit
c) For CNC input see section "5.07 H Tip Missing
Fault"
2. Defective Logic PCB
a) Jumper on Main PCB between J2-16 and test
point GND1. If gas does not flow, replace
Logic PCB
b) With Torch Switch closed, measure voltage
on Main PCB between test points GND1 to
I_DMD1 for 1.4VDC. Replace Logic PCB if
voltage is not present.