Hypertherm ArcGlide Torch Height Control, Instruction Manual

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2-54 ArcGlide THC Instruction Manual
INStALLAtIoN
2
Plasma I/o Description
Not Ready
This is an optional output from the plasma system that indicates that the plasma system is not
ready to receive a Plasma Start. The plasma system may be busy changing or purging gas flows
or be involved in some other time consuming operation. To insure proper operation the CNC
should check this signal before issuing a Plasma Start.
Corner
This is an optional output from the THC to the plasma system. This signal indicates that the
plasma system should reduce its output current to a pre-programmed level to improve the cutting
performance in corners. The default value is 50% of the normal cutting current.
Spare Input This is an extra input for future use.
Pierce
This is an optional output from the THC and input to HPR supplies. This signal informs the
plasma system that the unit is piercing and the plasma system should maintain the high shield
gas preflow during the pierce. This signal is used to improve the piercing capability of HPR power
supplies only.
Hold
This is an optional output from the THC and input to the plasma system. For a single torch
installation, this signal is optional but recommended. The CNC should activate this signal to delay
plasma torch ignition until all active torches in a multiple torch configuration have completed their
IHS sequence and are in position and ready to fire. At this point, all active torches will return
an active IHS Complete signal to the CNC and the CNC should remove all Hold Ignition input
signals and allow all active plasma torches to ignite simultaneously. This signal can also be used
to save cycle time by performing gas preflow during the IHS sequence.
Start*
This output from the THC is used to start the plasma system. This signal is a maintained signal.
The plasma system will continue to power the plasma cutting torch until this signal is removed.
When the Start signal is removed the plasma system begins to ramp down and turn off the torch
power.
Spare Output This is an extra output for future use.
Remote On
This is an optional output signal from the ArcGlide THC that can be used to power up or down
capable plasma power supplies. On capable systems, such as the HPR plasma supplies,
deactivating this signal will remove the high power input to the plasma system and will turn off the
gas and torch cooling pump. For more information, see Hypernet plasma interface (141161) in
the Maintenance section.
1/50th Arc
Voltage
This analog input to the THC provides the arc voltage feedback used for automatic height control.
The signal is scaled so that 5 volts DC equals an arc voltage of 250 volts DC. The positive side of
this voltage should be connected to chassis ground. To provide high accuracy this voltage should
have an effective output resistance of 2 K Ohms or less.