Hypertherm Command THC, Instruction Manual

Page: 172 / 220

OPERATION
CommandTHC for X-Y Table Instruction Manual 4-17
11
Problem Solution
Torch arc fails to transfer to workpiece.
• Check that Pierce Height is not too high by checking
Set Cut Height on Main Operating Screen and Pierce
Height Factor on Setup Screen A.
• Check work lead connection.
• Check torch consumables.
• Check for Transfer signal on control PCB, Machine
Interface Inputs, that D17 is illuminated.
Arc extinguishes immediately after transfer/excessively
large pierce hole.
• Check Pierce Delay on Automatic Operating Screen;
the delay is set too long. (The torch dwells in the
piercing position too long before machine motion.)
• Check that Machine Motion Out is active after
Pierce Delay ends.
Check on control PCB, Machine Interface Outputs, that
D25
is illuminated.
Torch moves before workpiece is pierced all the
way through. • Check Pierce Delay on Automatic Operating Screen,
the delay is set too short.
Torch dives below cutting height immediately after
pierce delay and before AVC begins.
• Increase Set Cut Height on Automatic Operating
Screen and decrease Pierce Height Factor on
Setup Screen A.
• Increase Machine Accel Delay on Setup Screen A.
Torch dives toward workpiece immediately after
AVC begins.
• Increase Set Arc Volts on Automatic Operating
Screen.
• Increase Machine Accel Delay on Setup Screen A.
• Decrease Set Cut Height on Automatic Operating
Screen.
Torch retracts from workpiece immediately after
AVC begins.
• Decrease Set Arc Volts on Automatic Operating
Screen.
• Increase Set Cut Height on Automatic Operating
Screen.
• Check plasma interface arc voltage wiring.
Erratic voltage control.
• Check for faulty grounds (work lead connection.)
• Check for water leaks.
Retract begins before arc has extinguished. • Increase Retract Delay on Setup Screen A.
Failure to retract.
• Decrease Homing Speed on Setup Screen A.
• Check for obstructions in the torch path and
torch lead set.