Hypertherm HD3070 Plasma Arc Cutting System w/ Automatic Gas Console - Manual (Page 138)

HD3070 with Automatic Gas Console Instruction Manual 5-13
16
MAINTENANCE
• If wiring is OK, 1XPCB4 or 1XPCB3 may be defective.
See Relay Board (1XPCB4) later in this section for
location of relays and description of output signals.
• If CON1 is getting 120VAC from the Relay Board as
described above, measure the voltage between all
terminals 1A, 1B and 1C of main transformer T2 after
the START command is given. See Figure 6-7 for
location of T2. The voltage between any two of the
three points should be equal to 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. Chopper is defective or not functioning.
Refer to CH130 Chopper Module Test Procedure later in
this section.
6. The unit stops cutting during
cut, or cuts poorly.
6.1. The work clamp is not connected or it is broken.
Connect or repair the work clamp.
6.2. Arc not transferring to workpiece.
Check work clamp and cable connecting clamp to
workpiece.
Good contact must be made in order for the arc to
transfer to the workpiece.
6.3. There is insufficient air or gas pressure.
Check gas inlet pressure specifications under Cut Chart
in Operation, Section 4. Check plasma and shield gas
pressures in TEST and RUN modes as specified under
Cut Chart in Operation, Section 4.
6.4. Torch is getting insufficient current.
Check the arc current setting for the type and thickness
of metal you are cutting from the Cut Chart in Operation,
Section 4.
Problem Possible Causes / Solutions