Hypertherm THC Control Board Replacement - Manual (Page 9)

Page 6 128407 Kit Instructions
HT4400 THC Control PC Board Calibration
HT4400 PROCEDURE
1. Turn off the power to the THC control
module and to the power supply.
2. Install the replacement PC board in to the THC control module and attach the electrical connections.
3 Attach the volt meter to measure the arc voltage between power supply I/O board bus bars as shown
below.
THC.109
IM379.01
1
2
Set volt meter to
measure 100-500 VDC.