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TroubleshooTing and sysTem TesTs

5-22 powermax

Service Manual

Test for 400V CE power supplies

For this test, you can use the test point loops or you can test on the capacitor screws. The test points are labeled on the

back of the power board, as are the voltages and positive and negative capacitor terminals.

CAUTION

To test using the test points, do not use a multimeter with test probes. Use E-Z Hook leads instead

and attach them to the test point loops.

1. Turn OFF the power.

2. Position the multimeter leads to measure the voltage on the power board by attaching the test leads with the

negative lead on TP 17 and the positive lead on TP 16. Turn on the power. The multimeter should read 560VDC.

If you get a value other than 560VDC, multiply the reading by 0.00601. Compare that value to a reading at pin 21

on J8. They should have the same value.

3. Attach E-Z Hooks to TP (test point)17 and TP18. Turn the power ON after you have connected the multimeter.

This value should be 280VDC or one-half of whatever value you found in step2.

Note: All values can be ±10%.

4. Turn the power OFF and move the E-Z Hooks to TP18 and TP16. Turn the power ON after you have connected

the multimeter. This value should be 280VDC or one-half of whatever value you found in step2.

5. The values found in steps3 and4 should be approximately equal. If they differ by more than 30V, replace the

power board.

TP17

TP18

TP16

~280 VDC

TP17

TP18

TP16

~280 VDC

Step 2

Step 4

Step 3

Hypertherm powermax45 Service Manual

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