Hypertherm HSD130 HySpeed Plasma - Manual (Page 176)

D4 should always be illuminated.
D5 illuminates as soon as the torch fires and will extinguish as soon as the arc
transfers to the workpiece. If arc transfer is immediate, the LED may not
illuminate.
If there is no arc at the torch or if the arc will not transfer:
1. Turn OFF all power to the system.
2. Remove wires from J4 ( TO WORK) and J3 (TO NOZZLE) studs on the
board.
3. Verify a resistance of 2 Ω between J4 and J7. If the resistance value is not
correct, replace PCB2.
Note: Resistance value may slowly increase to the correct value due to the
capacitance in the circuit.
4. Verify a resistance of 4 Ω across R7 and R6.
• The work lead should not have any cuts or breaks. verify a resistance of 1Ω or less. The work lead connection
to the cutting table should be clean and have good contact to the table.
• Verify that D4 is illuminated. If it is not illuminated the board may need to be replaced or the board may not be
receiving power.
• Fire the torch in the air and verify that D5 is illuminated. If it is not illuminated, but a pilot arc is established,
PCB2 may need to be replaced.
5. Place a 10 AWG (6 mm 2 ) jumper across J3 and J4. Perform a test cut. The nozzle will wear out after just a few
starts. If the arc transfers, replace PCB2.
MAINTENANCE
5-30 HySpeed HSD130 RHF Instruction Manual
TO WORK
TO NOZZLE
J3
J4
2Ω
4Ω
R7
R6
PCB2