Thermal Arc ULTIMA 150, Руководство по обслуживанию

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SECTION 3: SERVICE TROUBLESHOOTING 18 Manual 0-2503
c. 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.
NOTE
It is not recommended to supply both the Plasma
and Shield gas from one (1) regulator via "Y" con-
nections. It is an additional source for leaks and
flow rates for gases can be impacted when one is
changed.
WARNING
Use only pressure regulators to supply gas to the
Ultima-150. Do not use Flowmeter Regulators.
3. Faulty Gas Pressure Switch
NOTE
Both Plasma and Shield Gas Pressure Switches
must be satisfied for the GAS light to be green.
a. Verify gas pressure from customer source is set
to 35 psi.
b. Check the continuity of Plasma Gas Pressure
Switch between J5-1 and J5-2. Connection
should be closed if 35 psi gas pressure is sup-
plied. If Pressure Switch is open, replace
Plasma Gas Pressure Switch Assembly.
c. Repeat procedure above for Shield Gas Pres-
sure Switch. Replace if required.
NOTE
Both the Plasma and Shield Gas Pressure Switches
are in series connected to J5-1 and J5-2.
4. Faulty Logic PC Board
a. If 35 psi pressure is supplied, and both the
Plasma and Shield Gas Pressure Switches are
functioning properly, the GAS Indicator Light
should be green. If not, replace Logic PC Board.
B. Gas Flow Problems
1. Faulty Flow meters
a. Turn Plasma and Shield gas supplies on at cus-
tomer regulator and set to 35 psi.
b. Adjust the Plasma and Shield Gas Flow meters
on the front panel to desired flow rate. Gas
should be flowing through to the torch. (Con-
sult torch manual for proper flow rates to use.)
If there are no Flowmeter readings or flow rates
appear to be incorrect, check the torch for
blockage. Remove blockage if required.
If torch is clear and flow rates are still incor-
rect, replace Flow meter(s).
NOTE
For exact measurement of flow rates an external
calibrated Flow Gauge is required.
2. Faulty Plasma Gas Solenoid
If the gas pressure is 35 psi and Plasma Gas Flow-
meter is functioning properly but there is no gas
flow out the torch, the Plasma Solenoid may be
faulty.
a. Test the Plasma Gas Solenoid by measuring for
120 VAC across the 2 contacts on the Solenoid.
If 120 VAC is present, replace Plasma Gas So-
lenoid.
If 120 VAC is not present, replace the Logic PC
Board.
NOTE
Plasma gas flow from torch is normally very mini-
mal and barely noticeable on the hand.
3. Faulty Shield Gas Solenoid
If the gas pressure is 35 psi and Shield Gas Flow-
meter is functioning properly but there is no gas
flow out the torch, the Shield Solenoid may be
faulty.
a. Testing the Shield Gas Solenoid requires a
closed connection by jumping a switch between
TB1 terminals 17 and 18. Make this connec-
tion if required.
b. Test the Shield Gas Solenoid by measuring for
120 VAC across the 2 contacts on the solenoid.
In this condition 120 VAC should be present.
If 120 VAC is present, replace Shield Gas Sole-
noid.
If 120 VAC is not present, replace the Logic PC
Board.
c. Disconnect the switch between TB1 terminals
17 and 18 if not required for welding opera-
tion.