Hypertherm Powermax125 Service Manua - Manual (Page 164)

164 Powermax125 Service Manual 808070
8 – Troubleshooting and System Tests
Test 11 – Fan
Symptom: The fan does not operate properly.
 Wear proper personal protective equipment (PPE) 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 5 – Flyback circuit (DC minor
voltages) on page 156.
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 VDC, replace the power board.
Test 12 – AUX switch
Symptom: Upon power-up, fault code 0-19 displays. After 1 minute, fault code 0-99 displays. In service mode, the live
fault code is 2-01-1.
1. Turn the machine OFF and disconnect the power.
2. Disconnect the auxiliary switch cable from J5 on the power board.
3. Measure the resistance on the cable plug between pin 4 and pin 5.
4. If the power switch is closed (ON) there should be very low resistance.
5. If the power switch is open (OFF) there should be very high resistance.
6. If the resistance measurement does not agree, check the cable, plug, and switch for opens or shorts.