Hypertherm Powermax1250 Service Manual - Manual (Page 64)

MAINTENANCE
powermax1250 Service Manual 3-31
4
Test 14 – AUX switch
If the AUX switch on the ON/OFF switch (S1) is open when the system is powered up, the IF LED will illuminate
when the torch trigger is pulled or the start switch is pressed.
• Remove the J3 plug from the power board.
• With the ON/OFF switch S1 in the OFF (O) position and the unit unplugged from electrical power, the AUX
switch should read as open.
• With the ON/OFF switch in the ON (I) position, the AUX switch should read closed.
Test 15 – flyback circuit failure
Multiple flashing indicator LEDs can signal a failure in the flyback circuit.
• Unplug the fan. If the LEDs no longer flash, replace the fan. If the LEDs are still flashing, plug in the fan
again and perform the next step.
• Unplug the solenoid valve. If the LEDs no longer flash, replace the solenoid valve. If the LEDS are still
flashing, plug in the solenoid valve again and perform the next step.
• Unplug the CNC interface cable or the ON/OFF pendant on the back of the machine. If the LEDS are still
flashing, plug in the CNC interface cable again and perform the next step.
• Measure for 5 VDC on the power board (R15 or J5 pin 2 to TP1) while the lights are flashing. If the value is
not a constant 5 VDC (±0.5V), disconnect the control board and measure for 5 VDC again. If it is still not a
constant 5 VDC, replace the power board (PCB2).
• If no problems are found while completing the previous steps, replace the control board (PCB3).