Tweco Ultima 150 - Manual (Page 33)

Manual 0-2472 27 SECTION 5: GENERAL MAINTENANCE
2. No pilot arc /weak pilot arc
a. Pilot current too low
• Increase current by adjusting the Pilot Arc CUR-
RENT Adjust potentiometer on front panel of
the power supply.
b. Plasma Gas flow too low
• Increase flow rate
A-00827
• Remove sharp point (.015-.025) flat
• Sharpen to 20 degree included angle
• Surface finish minimum 32 microinch
Figure 5-4 Preparation Specifications
c. Electrode setting at maximum electrode setback
• Adjust electrode setting
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Figure 5-5 Minimum Electrode Setback
d. Improper electrode preparation
• Adjust electrode setting according to specifica-
tions
4. Coolant light is RED
a. Coolant Conductivity level is high
• Replace Coolant in per Section 3.11, Filling Cool-
ant Reservoir
5. Tungsten electrode in torch is discolored (bluing)
a. Gas leak is 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 the pres-
sure decreases, there is a leak in the system
• If gases are supplied to system via a pipeline,
the pipeline must be leakproof and excess sta-
tion drops must be closed
CAUTION
The pipeline should always be pressurized. Other-
wise the collection of moisture can result, causing
sever torch parts damage.
b. Contamination is present
• Check operational procedures. Improper start-
up/shut down procedures can contaminate the
electrode.
WARNING
Never use a rubber hose to supply gas to system;
moisture can impregnate rubber and damage the
torch parts and torch head.
F. DC Problems
1. No welding current/Pilot Arc On (no DC light)
a. Remote switch for Weld Arc ON not enabled
• Check remote switch to make sure it is on
• Check control signal assignments (J20 pins 3 to
4). Refer to Appendix III, Remote Wiring
• Check connections from J20 to TB1 on Logic
Board (LBD). Refer to Appendix III, Remote
Wiring
b. Work cable not attached or incorrectly attached to work
piece
• Attach work cable to piece per instructions in
Section 3.06, Work Cable Connection
G. Welding Problems
See the appropriate torch manual for torch troubleshoot-
ing.