Initial checks -13, Initial checks – Hypertherm MAX200 Service Manual User Manual
Page 54
MAX200
Service Manual
3-13
8-98
MAINTENANCE
Initial Checks
Before trouble-shooting specific problems, it is good practice to do a visual check, and verify that voltages are
present at the power source, transformer and power distribution board.
1. Disconnect line power by turning main disconnect switch off and unplugging the power supply unit.
2. Using a Phillips head screwdriver, remove top access panel, 2 side access panels, and front and rear access
panels.
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 to identify parts and part numbers.
4. If no damage is apparent, plug in the power supply unit, and apply power by turning on the main disconnect
switch.
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). See Figure 3-1, item 5. Refer to wiring diagram supplied with manual, if required. The voltage between any
2 of the 3 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 or replace any defective components.
For a 400-volt CE power supply, measure the voltage between the U, V and W studs on the EMI filter. Refer to
Appendix A. Also refer to wiring diagram supplied with manual, if required. The voltage between any 2 of the 3
studs should be equal to the supply voltage (400 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 or replace
any defective components.
WARNING
SHOCK HAZARD:
High voltages inside the power supply can kill! Always use caution when servicing
a power supply that is plugged in and has an access panel removed.
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