Hypertherm HD3070 Plasma Arc Cutting System w/ Automatic Gas Console - Manual (Page 132)

HD3070 with Automatic Gas Console Instruction Manual 5-7
18
MAINTENANCE
Initial Checks
Before tracking down specific problems, it is good practice to do a visual check, and verify proper voltages are
present at the power source, transformer and power distribution board.
1. Disconnect line power by turning line disconnect switch Off.
2. Using a Phillips head screwdriver, remove top plate, two side plates, front plate, and rear plate.
3. Inspect interior of unit for discoloration on pc boards, or other apparent damage. If a component or module is
obviously defective upon visual inspection, remove and replace it before doing any testing. Refer to the Parts
List, Section 6 to identify parts.
4. If no damage is apparent, apply power to power unit by turning on the line disconnect switch On.
5. For a 200, 208, 240, 480, or 600- volt power supply measure the voltage at TB1 between L1 (U), L2 (V) and L3
(W). Refer to Figure 5-1 for detail of TB1. Also refer to applicable wiring diagram supplied with manual, if
required. The voltage between any two of the three points at TB1 should be equal to the supply voltage (200,
208, 240, 480, or 600 VAC). If there is a problem at this point, disconnect main power and check connections,
power cable, and fuses or circuit breaker at line disconnect switch. Repair and/or replace defective
component(s) if necessary.
For a 220/380/415- volt power supply measure the voltage at between the U, V and W studs on the EMI filter.
Refer to Appendix F. Also refer to applicable wiring diagram supplied with manual, if required. The voltage
between any two of the three studs should be equal to the supply voltage (220, 380, or 415 VAC). If there is a
problem at this point, disconnect main power and check connections, power cable, and fuses or circuit breaker
at line disconnect switch. Repair and/or replace defective component(s) if necessary.
WARNING
SHOCK HAZARD: Always use caution when servicing a power supply when plugged in and the covers are
removed. Dangerous voltages exist within the power supply which could cause injury or death.
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