Tweco Ultima 150 - Manual (Page 32)

SECTION 5: GENERAL MAINTENANCE 26 Manual 0-2472
C. Plasma/Shield Gas Problems
1. Gas light not on
a. Gas tank(s) empty; not connected properly; not turned
on
• Check gas tanks, connect gas supply or turn on
gas supply flow, as necessary
b. Gas pressure switches not satisfied
• Set Plasma and Shield Gas inlet pressure to 35
psi
c. Gas leak present
• Check system for gas leaks. One way to verify
gas leaks is to turn off the system and gas sup-
ply at source and watch pressure gauges on
regulators. With no gas flow, the pressure at the
regulators should remain constant. If pressure
decreases, a leak is present in the system
• If gases are supplied to system via a pipeline,
check that all excess station drops are closed
and there are no leaks in the pipeline
CAUTION
The pipeline should always be pressurized. Other-
wise the collection of moisture can result, causing
sever torch parts damage
WARNING
Never use a rubber hose to supply gas to system.
D Cooling System Problems
1. Coolant light blinks RED/GREEN ( pump does not
operate)
a. Coolant flow is inadequate
• Clean In-line Filter, Coolant Filter, and replace
Reservoir Deionizer Bag, as necessary
b. Coolant levels are inadequate
• Add coolant to reservoir. Cycle the main switch
disconnect, then cycle the ON/SET switch
c. Air in cooling system
• Toggle the main switch disconnect off then force
a 3 second pump operation cycle. Repeat if nec-
essary for continuous pump operation
2. Coolant light is RED
a. Coolant Conductivity level is high
• Replace reservoir coolant per Section 3.11, Fill-
ing Coolant Reservoir
E. Pilot Arc Problems
1. No pilot arc (no pilot light)
a. Gas pressures not satisfied (gas light off)
• Check Plasma and Shield gas pressures. Gases
should be 35 psi.
• Check system for gas leaks. One way to verify
gas leaks is to turn off the system and gas sup-
ply at source and watch pressure gauges on
regulators. With no gas flow, the pressure at the
regulators should remain constant. If the pres-
sure decreases, there is a leak in the system
b. Pilot ON/SET switch not reset
• Reset ON/SET Switch on front panel
c. Improper installation of torch parts
• Check installation procedure for torch parts (see
appropriate torch manual)
d. Tip shorted to electrode
• Replace parts and check electrode setback
e. Shorted torch
• Check torch, replace if necessary
NOTE
The pilot arc is always latched off in the event of
power supply interlock trip. The pilot must be dis-
abled and then re-energized to initiate the pilot arc
after a fault shutdown.
f. Remote pilot switch not enabled (if applicable)
• Enable signal; remote pilot arc option TB1-12 &
13 positions. ON/SET switch on front panel
must be in ON position
g. Coolant Conductivity high (if applicable)
• Check remote wiring on Logic Board TD1 (if
remote wiring has been interfaced to indicate
high coolant conductivity levels)