Miller Electric 188 036G - Manual (Page 21)

OM-2219 Page 17
4-3. Trouble Lights
1 Pressure Light
Lights if gas/air pressure is below
40 PSI (276 kPa).
Turn power Off, and check for prop-
er gas/air pressure (see Section
3-2).
2 Cup Light
Lights if shield cup is loose.
Turn power Off, and check shield
cup connection (see torch Owner’s
Manual). Power must be reset
whenever the cup shutdown is
activated.
Check shield cup shutdown system
once a week (see Section 4-4).
3 Temperature Light
Lights if power source overheats
(see Section 2-2).
1
2
3
Difficulty establishing pilot arc may indicate
consumables need to be cleaned or replaced.
Ref. ST-189 734
4-4. Checking Shield Cup Shutdown System
Ref. ST-801 300-A
1 Torch Shield Cup
Turn Power On and loosen shield
cup. If shutdown system works
properly, Ready light goes off and
Cup light comes on. If not, immedi-
ately turn Off power and have Fac-
tory Authorized Service Agent
check safety control board PC1 op-
eration.
If system works properly, retighten
cup and reset power.
1
.
Power must be reset whenever the cup shutdown
system is activated. Always turn Off power when
changing or checking consumables.
4-5. Troubleshooting
Trouble Remedy
No pilot arc; difficulty in establishing an
arc. Clean or replace worn consumables as necessary (see torch Owner’s Manual).
Check for damaged torch or torch cable (see torch Owner’s Manual).
Check ground fault circuit interrupter (see Section 4-2).
Have Factory Authorized Service Agent check power switch S1, control relay CR1, CR5 and CR6, rectifi-
ers SR1 and SR2, safety control board PC1, power control boards PC2 and PC3, inductor L1, resistor
R1, and check gas/air system for leaks.