Hypertherm HT4001 Plasma Arc Cutting System - Manual (Page 145)

MAINTENANCE
3-98
HT4001
Instruction Manual 6-19
Problem Possible Causes and Solutions
14. The unit stops cutting during
cut, or cuts poorly.
14.1. Arc not transferring to workpiece.
Check work cable. Good contact must be made in order for the
arc to transfer to the workpiece. Connect or repair the work
cable.
14.2. There is insufficient air or gas pressure.
Check gas inlet pressure specifications under Cut Charts in
Operation section. Check plasma gas and water injection
pressures in TEST and RUN modes as specified under Cut
Charts in Operation section.
14.3. Consumable parts are worn.
See Changing Consumable Parts in the Operation section
(section 5).
14.4. System needs fine tuning to correct a faulty cutting condition.
Optimum cutting sometimes needs to be fine tuned to the
application and materials on site. Certain cutting faults can be
corrected by adjusting the suggested parameters in the Cut
Charts. See Cutting Techniques beginning on page 5-15.
14.5. Torch is getting insufficient current.
Check the arc current setting for the type and thickness of metal
you are cutting from the Cut Charts in the Operation section
(section 5).
14.6. The power supply has overheated.
Shut down system and wait for unit to cool down. If unit will not
restart, see Status LED Troubleshooting guide later in this
section.
14.7. Choppers are defective or not functioning.
See Chopper Module Test Procedure later in this section.
14.8. Input voltage has dropped below 15% of nominal value.
See Error Codes later in this section and Power Requirements
in Section 3.