Thermal Dynamics 51 CUTMASTER, Руководство по обслуживанию

Страница: 29 / 88

Manual 0-2972 4-9 TROUBLESHOOTING
G. Gas continues to flow with RUN / RAPID AUTO
RESTART / SET switch in RUN position.
1. Damaged gas solenoid.
a. Turn the front panel ON/OFF switch to OFF.
• If gas continues to flow, debris from the air line
is preventing the solenoid from closing. Clean
or replace the solenoid.
2. Faulty RUN / RAPID AUTO RESTART / SET switch.
a. Put switch in SET position. Disconnect wire
harness connector from Main PC Board recep-
tacle J18. Check continuity through wire har-
ness sockets 7 and 8. If no continuity, replace
switch.
3. Faulty Logic PCB.
a. Measure for approximately 12 vdc between
P1-7 and TP-1 on the Logic PCB.
• If 0 vdc is present, replace Logic PCB.
H. Gas flows continuously when power is turned on;
AC indicator flashes, TEMP indicator off,
GAS indicator ON, DC indicator off
A
Ar
t # A-03
9
87
1. Torch switch is activated (closed) before user turns power
on
a. Release torch switch, turn power supply OFF,
then ON (with torch switch released).
2. Faulty torch switch
a. Turn power supply OFF. Disconnect torch from
power supply. Refer to Appendix Pages for
Torch Pin-Out Diagrams. Check torch switch
continuity through sockets 3 and 4.
NOTE
In mechanized (machine) torch applications, remote
pendant control switch must also be closed.
I. Gas cycles on and off when power is turned on; AC
indicator flashes; TEMP indicator off,
GAS indicator ON
A
Ar
t # A-03
9
87
1. Torch shield cup is loose.
a. Tighten shield cup by hand. Do not overtighten.
2. Torch tip, electrode, or starter cartridge missing
a. Turn off power supply. Remove shield cup, in-
stall missing parts.
3. Torch starter cartridge is stuck
a. Turn off power supply. Bleed down the system.
Remove shield cup, tip, and starter cartridge.
Check starter cartridge lower end fitting for free
movement. Replace cartridge if lower end fit-
ting does not move freely.
Lower End Fitting
Start Cartridge
Art # A-03621
4. Shorted power supply torch receptacle
a. Turn Power Supply OFF. Bleed down the system.
Disconnect the torch from the power supply.
Check the torch receptacle for continuity between
the pilot connection and the negative / plasma
connection. Refer to Appendix pages. There
should be no continuity.
5. Shorted Main PC Board.
a. Turn Power Supply OFF. Bleed down the system.
Refer to Main PC Board Wiring Diagram. Check
Main PC Board for continuity between terminals E6
and E10. If continuity is found, replace Main PC
Board.