Hypertherm HT4400 HySpeed Plasma Arc Cutting System - Manual (Page 111)

MAINTENANCE
5-20 HT4400 Instruction Manual
3
Current Sense Test
The signals from the current sensors can be measured as voltages. Use the table and figure below to check for
proper current levels when the power supply is ON and the torch is cutting.
WARNING
SHOCK HAZARD: Always use caution when servicing a power supply when plugged in and
the covers are removed. Dangerous voltages exist within the power supply which could
cause injury or death.
REC9
REC10
REC5 REC6 REC7
REC3
REC4
Chopper Measurement Point Output Value
CH1 REC9 pins 3 & 4 4 V = 100 amps
CH2 REC5 pins 3 & 4 4 V = 100 amps
CH3 REC6 pins 3 & 4 4 V = 100 amps
CH4 REC7 pins 3 & 4 4 V = 100 amps
Total Current REC10 pins 3 & 4 3.2 V = 400 amps