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Current sense test -20, Current sense test – Hypertherm HT4400 HySpeed Plasma Arc Cutting System User Manual

Page 111

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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