MAINTENANCE
5-8 HySpeed HT2000LHF Instruction Manual
6
Problem Possible Causes / Solutions
5.2. Pilot arc relay CR1 is defective.
If there is 120VAC across the relay (see previous steps),
and CR1 does not close, replace CR1.
5.3. Main contactor (CON1) or PCB4 is defective.
• With an AC voltmeter, see if there is 120VAC at contactor
CON1 after the START command is given. If there is no
120VAC, check pins, connectors and associated wiring
from CON1 to PCB4.
• If wiring is OK, PCB4 or PCB2 may be defective.
• If there is 120VAC at CON1 as described above, measure
the voltage between secondary terminals of the main
transformer T2 after the START command is given. The
voltage between any two of the three points connected to
each chopper input should be equal to about 200VAC.
If there is no voltage at any of the above points, replace
CON1.
If there is voltage at some but not all of the above points,
check wiring and connections to and from T2. If wiring
checks out OK, return to Initial Checks section and repeat
steps 1-5.
5.4. Choppers are defective or not functioning.
See Chopper Module Test Procedure later in this section.
6. The unit stops cutting during cut, or
cuts poorly.
6.1. The work cable is not connected or it is broken.
Connect or repair the work cable.
6.2. Arc not transferring to workpiece.
Check the work cable connection to the workpiece. Good
contact must be made in order for the arc to transfer.
6.3. There is insufficient air or gas pressure.
Check the gas inlet pressures and the plasma and shield
gas pressures in TEST and RUN modes as specified in the
Cut Charts.
6.4. Torch is getting insufficient current.
Check the arc current setting in the Cut Charts for the type
and thickness of metal you are cutting.
6.5. The power supply has overheated.
Shut down the system and wait for the power supply to cool
down. If the power supply will not restart, see Status LED
Troubleshooting guide later in this section.
6.6. Choppers are defective or not functioning.
See Chopper Module Test Procedure later in this section.
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