Hypertherm PHC Sensor - Manual (Page 53)

Section 4: Troubleshooting 53
Problem Solution
Arc extinguishes after
Transfer with large pierce
hole ¾ Check that the pierce delay is not too long.
¾ Check that the machine motion output is active and
connected to the CNC.
¾ Check that the CNC is active and the set machine speed is
appropriate.
Torch begins cutting before
the pierce is complete ¾ Check that the pierce delay is not set too short.
Torch dives toward plate
immediately after voltage
control begins
¾ Increase the Set Arc Voltage value.
¾ Increase Machine Accel Delay – DIP SW#7 Off.
¾ Check the arc voltage calibration.
Torch retracts from plate
immediately after voltage
control begins ¾ Decrease the Set Arc Voltage value.
¾ Increase the Set Pierce Height value.
¾ Check the arc voltage calibration.
Erratic voltage control ¾ Check all system ground connections.
¾ Check the torch for cooling water leaks.
Failure to retract at end of cut ¾ Check End of Cut Retract settings – DIP SW #9 & #10.
¾ Check for torch and lead set binding or obstruction.
Torch breakaway error
If the torch breakaway has not tripped, check the connections from the lifter to
the PHC:
1. To test the switch, touch a piece of metal to the target on the magnetic
sensor at the top of the breakaway. The LED in the middle of the sensor
lights up if the switch is working.
2. Verify that the ground is seamless from the lifter interface board to the
start ground on the work table. See Figure 13 on page 12.
3. Verify that the magnetic sensor cable is connected to the lifter interface
board. This connector is third from the top of the board.
Target
LED