Hobart Welding Products AIRFORCE OM-279 - Manuel (Page 23)

OM-279 Page 19
4-4. 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).
Have Factory Authorized Service Agent check power switch S1, control relay CR1, CR5 and CR6, rectifi-
er SR1 (and SR2 for single-phase models), safety control board PC1, power control boards PC2 and
PC3, inductor L1, resistor R1, and check gas air system for leaks.
No cutting output; Power light off;
Trouble lights off; Ready light off; fan mo-
tor FM does not run. Place Power switch in On position.
Place line disconnect device in On position (see Section 2-10).
Check line fuse(s) and replace if needed or reset circuit breakers (see Sections 2-8 and 2-10).
Have Factory Authorized Service Agent check power switch S1, transformer T1, and fan motor.
No cutting output; Power light on; Ready
light on; Trouble lights off; fan motor FM
running. Be sure work clamp is connected.
Clean or replace worn consumables as necessary (see torch Owner’s Manual).
Have Factory Authorized Service Agent check safety control board PC1, power control boards PC2 and
PC3, and rectifier SR1 (and SR2 for single-phase models).
No cutting output; Power light on; Ready
light on; Trouble lights off; fan motor FM
running slowly. Check position of input voltage jumper links (see Section 2-9).
Check input power, and check for proper input connections (see Sections 2-8 and 2-10).
No control of output. Have Factory Authorized Service Agent check safety control board PC1 and power control boards PC2
and PC3.
No gas/air flow; Power light on; Ready
light on; Trouble lights off; fan motor FM
running. Have Factory Authorized Service Agent check for proper torch connections, and check safety control
board PC1. Check operation of gas valve GS1, and check gas/air system for leaks.
Pressure Trouble light On; Ready light
off. Check for correct gas/air pressure adjustment (see Section 3-2).
Check for sufficient gas/air supply pressure (see Section 2-6).
Check for dirty air filter/regulator and clean, if needed (see manufacturer’s instructions).
Check air lines for leaks.
Have Factory Authorized Service Agent check pressure switch S3 and safety control board PC1.
Cup Trouble light On; Ready light off. Check torch shield cup (see Section 4-3). Reset power switch.
Have Factory Authorized Service Agent check for proper torch connections, and check safety control
board PC1.
Temperature Trouble light On; Ready
light off. Main transformer or main rectifier overheating. Allow fan to run; the Trouble light goes out when the unit
has cooled.
Have Factory Authorized Service Agent check safety control board PC1.