Test 10 – pressure sensor, Test 10 – pressure sensor -57, Powermax – Hypertherm Powermax105 Service Manual User Manual
Page 195
TroubleshooTing and sysTem TesTs
powermax
105 Service Manual
8-57
test 10 – Pressure sensor
Symptom: The pressure sensor reading doesn’t agree with known pressures.
Note: Wear proper personal protective equipment (PPE) before testing powered equipment.
1. Remove the white cover on the plug at J3 on the power board.
2. Turn the machine ON.
3. Measure power to the sensor between Pin 2 and Pin 3.
If not 5.0 (±5%) perform the Flyback Circuit test above.
4. From the service screen enable the gas test.
Note the flowing gas pressure in the “P” field to the right of the slash.
5. Measure VDC between Pin 2 (-) and Pin 1 (+)
The value should be 0.0463 times the pressure, for example (68 PSI * .0463 VDC/PSI = 3.148 VDC).
If the voltage measurement is within ±10% of the correct value and you have a pressure warning or fault:
a. Test with a known working DSP board.
b. If the measured voltage is correct, replace the DSP board.
c. If the measured voltage is not correct, replace the pressure sensor.