Hypertherm HT200LHF-200 Volt HySpeed - Manual (Page 93)

MAINTENANCE
5-4 HySpeed HT2000LHF
Instruction Manual
7
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. Place the line disconnect switch in the off position.
2. Using a Phillips head screwdriver, remove the top plate, two side plates, front plate, and rear plate.
3. Inspect the interior of the power supply 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 testing.
Refer to
Section 6
to identify parts and part numbers.
4. If no damage is apparent, place the line disconnect switch in the on position.
5. Measure the voltage at TB1 between L1, L2 and L3. Refer to Figure 5-2 for detail of TB1. The voltage between
any two of the three points at TB1 should be equal to your supply voltage. If there is a problem at this point,
disconnect the main power and check connections, power cable, and fuses at the line disconnect switch.
Repair and/or replace defective component(s) if necessary.
WARNING
SHOCK HAZARD: Always use caution when servicing a power supply when it is plugged in and the
covers are removed. Dangerous voltages exist within the power supply which could cause injury or
death.
Measure the voltage for the 400 volt CE power supplies between the U, V and W
terminals of TB1 in the EMI filter located on the top of the power supply. Refer
to the appendix section.
Figure 5-2 Primary Power Measurement Location – HT2000LHF
WARNING
There is line voltage at the contactor if the line
disconnect switch is in the ON position, even if the
ON (1) pushbutton on the HT2000 power supply has
not been pressed. Use extreme care when
measuring primary power in this area. Voltages
present at the terminal block and contactor can
cause injury or death!