Hypertherm Powermax30 AIR Service Manual - Manual (Page 83)

Powermax30 AIR Service Manual 808850 83
5 – Troubleshooting and System Tests
6. Measure the voltage from W to R. See Figure 13.
a. Position the test hooks on W and R on the power board.
b. Turn the power ON (I).
c. The multimeter should read 375 VDC.
If you get a value other than 375 VDC, multiply the reading by 0.00601 to convert it to millivolts. Test pin 21 on J7.
See
Test 2 – power board voltage checks on page 80. If the values match, it is a normal reading.
7. Measure the voltage from W to B.
a. Turn the power OFF (O).
b. Move the test hooks to W and B.
c. Turn the power ON (I).
d. This value should be 187.5 VDC or one-half of the value found in step 6.
8. Measure the voltage from R to B.
a. Turn the power OFF (O).
b. Move the test hooks to R and B.
c. Turn the power ON (I).
d. This value should be 187.5 VDC or one-half of the value found in step 6.
9. The values found in step 7 and step 8 should be approximately equal. If they differ by more than 30 V, replace the
power board.
Figure 13
WORK LEAD (BLK)
BLK
BLK
TORCH START
AC AC
R w
step 8
step 7
step 6