Hypertherm Powermax105 Service Manual - Manual (Page 196)

TroubleshooTing and sysTem TesTs
8-58
powermax
105 Service Manual
test 11 – Fan
Symptom: The fan does not operate properly.
Note: Wear proper PPE protection before testing powered equipment.
1. Remove the inverter temperature sensor plug from J2 on the power board.
2. Place a jumper between Pin 1 and Pin 3 of connector J2 on the power board.
3. Remove the white cover from the fan control cable at J1.
4. Turn the machine ON. (The fan should be running.)
5. With the fan control cable connected to J1, measure the DC voltage between Pin 1 and Pin 4 in the plug.
a. If the voltage is 48 VDC (±5%), replace the fan.
b. If the voltage is not correct:
- Remove the fan control cable and re-measure the DC voltage on the power board connector between Pin
1 and Pin 4 of J1.
- If the voltage is 48 VDC, replace the fan. Otherwise, perform Test 6 – Flyback circuit above.
c. If the system passes the flyback circuit test:
- If the voltage between Pin 1 and Pin 3 (J1) is 0 VDC, replace the DSP board.
- If the voltage is greater than 0, replace the power board.