Hypertherm THC ArcGlide - Manual (Page 183)

ArcGlide THC Instruction Manual 806450 183
4 – Maintenance
Inaccurate IHS with Nozzle Ohmic Contact.
 Verify that the THC is in Automatic Mode. If not, select Automatic Mode.
 Verify that Nozzle Ohmic Contact is ON (enabled).
 Verify that the nozzle ohmic contact wire is connected at both ends.
 Verify that the torch retaining cap is tight.
 Examine the workpiece for water. If there is water, use Stall Force sensing and disable the ohmic contact.
 If you are cutting under water, use only Stall Force.
 Examine the workpiece for any type of coating, such as oil or plastic. If there is a coating, use Stall Force sensing.
 Examine the nozzle and shield and, if necessary, clean or replace them.
 Examine the work lead connection.
Inaccurate IHS with Stall Force sensing.
 Verify that Nozzle Ohmic Contact is OFF (disabled).
 Make sure the value for Transfer Height is correct.
 Verify that Stall Force is not set too high.
 Verify that the workpiece is not deflecting excessively. Examine the table supports under the workpiece. Offset
workpiece deflection by adjusting Set Cut Height and Transfer Height to achieve the improved results.
Torch fails to ignite.
 Verify that the plasma system is operational.
 Verify that the Start signal is transmitted.
 Verify that the IHS piercing height is correct for the torch.
 Verify that IHS SYNC is OFF on the control module CNC interface inputs. See Screen 3 – Inputs from the CNC on
page 138 for more information.
 Examine the torch consumables and replace them if necessary.
 Verify that the corresponding station is enabled.
Torch arc fails to transfer to workpiece.
 Verify that Transfer Height is not set too high. It is typically a percentage of Cut Height.
 Examine the work lead connection.
 Examine the torch consumables, and replace them if necessary.
 Look at the Motion input in the display window on the control module to see if it turns ON. This input confirms arc
transfer. (See
Screen 9 – Inputs from the plasma system on page 141 for more information.)
Arc extinguishes immediately after transfer or creates an excessively large pierce hole.
 Verify that Pierce Time is set correctly. The delay is set too long so that the torch dwells in the piercing position too
long before machine motion.
 Verify that Machine Motion Out is active after Pierce Delay ends.