Hypertherm HSD130 HySpeed Plasma User Manual
Page 183
MAINTENANCE
HySpeed HSD130 RHF
Instruction Manual
5-37
Test 3 – using a meter to measure open circuit voltage (OCV)
J6.3
(WORK)
J6.2
(NEGATIVE)
1. It is best to use clip-on test leads to keep your hands and the meter outside the power supply. Connect the meter to
J6.3 (WORK) and J6.2 (NEGATIVE) on the I/O board (PCB 6).
2. Turn ON the system.
3. The automatic chopper test will begin when the purge cycle starts. You will hear the main contactor close and 0 to
5 seconds later the meter should show 311 VDC. This is the OCV for channel 1. The voltage will start to decrease to
0 VDC and will then spike back up to 311 VDC again. The second reading represents the OCV for channel 2.
DANGER
SHOCK HAZARD: The system will close the contactor and feed voltage to the I/O board (PCB6) with
no input from the technician. Lethal voltages greater than 300 VDC will be present at times during
power-up.