SERVICE 5-4 Manual 0-2868
3. Actual input voltage does not correspond to voltage of
unit
a. Verify that the input line voltage is correct. Re-
fer to Appendix 1, Input Wiring Requirements.
4. Unit internal fuse blown or loose
a. If blown, double check input voltage and replace
fuse per subsection 5.05-B. If fuse blows again,
return unit to an authorized service center.
5. Faulty components in unit
a. Return for repair or have qualified technician
repair per Service Manual.
B. AC Power indicator ON; TEMP indicator
ON
1. Air flow obstructed
a. Check for obstructed air flow around the unit
and correct condition.
2. Fans blocked
a. Check and correct condition.
3. Unit is overheated
a. Allow unit to cool down for at least 5 minutes.
Make sure the unit has not been operated be-
yond Duty Cycle limit. Refer to Section 2.03.
4. Input line voltage is below 75% of rated level
a. Check and connect to proper input power line.
5. Faulty components in unit
a. Return for repair or have qualified technician
repair per Service Manual.
C. Torch will not pilot when torch switch is activated
1. RUN / SET switch in SET position
a. Move switch to RUN position.
2. Faulty torch parts
a. Inspect torch parts and replace if necessary (re-
fer to Instruction Manual supplied with torch).
3. Gas pressure too high or too low
a. Set pressure to 70 psi (4.8 bar).
4. Faulty components in unit
a. Return for repair or have qualified technician
repair per Service Manual.
D. No cutting output; Torch activated; AC Power
indicator ON; Gas flows; Fans operate
1. Torch not properly connected to power supply
a. Check that torch leads are properly attached to
power supply.
2. Shield cup not properly installed on torch
a. Check that shield cup is fully seated against torch
head. Refer to the torch manual for details.
3. Faulty components in unit
a. Return for repair or have qualified technician
repair per Service Manual.
4. Faulty Torch
a. Return for repair or have qualified technician
repair per Torch Manual.
E. Low cutting output
1. Incorrect setting of output (A) control
a. Check and adjust to proper setting.
2. Faulty components in unit
a. Return for repair or have qualified technician
repair per Service Manual.
F. Limited output with no control
1. Poor input or output connections
a. Check all input and output connections.
2. Faulty components in unit
a. Return for repair or have qualified technician
repair per Service Manual.
G. Erratic or improper cutting output
1. Poor input or output connections
a. Check all input and output connections.
2. Poor ground or work connection is poor.
a. Check connection.
H. Arc shuts off during operation; Arc will not restart
when torch switch is activated.
1. Unit is overheated (TEMP indicator ON)
a. Allow unit to cool down for at least 5 minutes.
Make sure the unit has not been operated be-
yond Duty Cycle limit. See Section 2 for duty
cycle specifications.
2. Fan blades blocked (TEMP indicator ON)
a. Check and clear blades.
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