Hypertherm Command THC, Instruction Manual

Page: 171 / 220

OPERATION
4-16 CommandTHC for X-Y Table Instruction Manual
11
Table 4-1 THC operating cycle (automatic mode) process problems and solutions
(Refer to operating cycle time-line on previous page)
Problem Solution
No response to CYCLE-START-IN at THC.
• Check power to THC. On THC control PCB, D41 – D44 should be
illuminated.
Check line input fuses in THC power module.
• Check for bad Cycle Start connection. Check on THC control PCB,
Machine Interface Inputs, that D9 is illuminated.
• Check on control PCB, Machine Interface Inputs, that D15 is
illuminated.
• Check on control PCB, External Interlock OK, that D16 is illuminated.
• Check that Maintenance Mode is not selected on pendant or do
query on RS-422.
Arc ignites before IHS is complete.
• Check that Preflow During IHS is OFF (disabled) on Setup Screen A.
• If plasma power supply has a Hold signal, check that it is wired properly.
Torch does not approach workpiece at
programmed IHS speed and stall force.
• Check that THC is in Automatic Mode. If not, press <AUTO/MAN>
key on keypad.
• Check that Stall Force is not set too low on Setup Screen A.
• Check that IHS Speed is not set too high on Setup Screen A.
• Check for cable and hose obstructions that may stop movement.
Inaccurate IHS with nozzle ohmic contact.
• Check that THC is in Automatic Mode. If not, press <AUTO/MAN>
key on keypad to select Automatic Mode.
• Check that Nozzle Ohmic Contact is ON (enabled) on
Setup Screen A.
• Check that nozzle ohmic contact wire is not disconnected. Ensure wire
is connected at both ends.
• Check Pierce Height Factor on Setup Screen A.
• Check that torch retaining cap is tight.
• Check for water on the workpiece. If present, use Stall Force sensing.
Refer to 5b on previous page.
• Check for coating (oil, plastic, etc.) on the workpiece. If present, use
Stall Force sensing. Refer to 5b on previous page.
• Check nozzle/shield, clean or replace.
• Check work lead connection.
Inaccurate IHS with Stall Force sensing
• Check that Nozzle Ohmic Contact is OFF (disabled) on
Setup Screen A.
• Check Pierce Height Factor on Setup Screen A.
• Check that Stall Force is not set too high on Setup Screen A.
• Check that workpiece is not deflecting excessively. Check the work
table supports under the workpiece.
• Offset workpiece deflection by adjusting Set Cut Height on Automatic
Operating Screen and Pierce Height Factor on Setup Screen A to
achieve desired results.
Torch fails to ignite.
• Ensure plasma system is operational.
• Check for proper IHS piercing height. Check torch.
• Check that IHS SYNC is off. Check on THC control PCB, Plasma
Interface Inputs, that D13 is extinguished.
• Check torch consumables.