Test 2 — power board voltage checks, Powermax30 – Hypertherm Powermax30 Service Manual User Manual
Page 55
MAINTENANCE
3-16
powermax30
Service Manual
Test 2 – power board voltage checks
With the power ON, use a meter to verify the voltages at the J7 pins listed in the following table to be certain that
the power board is functioning correctly. If any of the values are incorrect, replace the power board.
Note:
All values can be ±10%.
J7 pin number to
ground
Test
Expected value
19
VACR (rectified AC line voltage)
0.86 V @ 120 line voltage
1.87 V @ 230 line voltage
21
VBUS (DC bus voltage)
2.28 VDC @ 375 VBUS
18
IPFC (input current)
< 0.1 VDC
20
IFB (output current)
< 0.1 VDC
22
ITF (transfer current)
< 0.1 VDC
5
3.3 VDC
3.3 VDC ±5%
7
5 VDC
5 VDC ±5%
12
24 V sense pin
2.2 VDC
16
Start signal
3.2 VDC closed
0 VDC open
Note:
To test the values at pin 16, you must have the torch and power supply positioned such that you can
safely pull and release the torch’s trigger.
Ground to the ground wire
clip or to the heat sink
Caution:
Do not use -VBUS as ground. Doing so could destroy the power supply. Instead
ground to either the ground wire clip on the rear endcap or to the heat sink as
shown below.