Hypertherm Powermax350 Service Manual - Manual (Page 33)

3-9 Service Manual
M
AINTENANCE
TROUBLESHOOTING
Refer to Figure 3-4 and 3-5 to assist in the troubleshooting process.
WARNING
SHOCK HAZARD: Always turn off the power and unplug the cord or set
the line disconnect switch to Off before servicing the unit or changing
consumable parts. In the U.S., use a "lock-out / tag-out" procedure until
the service or maintenance work is complete. In other countries, follow
appropriate national or local safety procedures.
Problem Cause/Solution
1. No pilot arc; difficulty in establishing an arc.
2. No cutting output; POWER ON, READY,
PRESSURE, TORCH CAP and OVER-TEMP LEDs
extinguished; fan not operating.
1.1 Clean or replace worn consumables as
necessary.
1.2 Check for proper installation of swirl ring.
1.3 Check for damaged torch or torch lead.
1.4 Check air system for leaks.
1.5 Check coil voltage and connections of control
relay CR6. Check continuity of coil and condition
of contacts. Replace if necessary.
1.6 Check coil voltage and connections of gas valve
GS1. Check continuity of coil. Replace if
necessary.
1.7 Check integrated rectifier SR1. Replace if
necessary.
1.8 Check power control board PC1 and connections.
Replace if necessary.
1.9 Check safety control board PC2 and connections.
Replace if necessary.
2.1 Place the Power switch to On (I).
2.2 Plug in the power cord or set line disconnect
switch to On.
2.3 Check line disconnect fuses and replace if
needed or reset circuit breakers.
2.4 115/230 Volt units: Check position of input
voltage selector switch S2.
7-98