Hypertherm PHC Sensor - Manual (Page 31)

Section 2: Installation and Setup 31
IHS Sync
This optional CNC output is used to synchronize torches in a multiple torch installation. The CNC issues this
signal to delay plasma torch ignition until all torches in a multiple torch configuration have completed their IHS
sequence and are in position and ready to fire. When the CNC releases (de-activates) this signal, the torch
ignites and the plasma torch begins piercing.
For single torch installations, this signal is not required and can be left unconnected.
IHS Complete
This optional signal is an output from the PHC and an input to the CNC. This signal is used to indicate that
initial height sensing is complete and that a torch is in position and ready to fire. For multiple torch installations,
the CNC waits for all active torches to indicate IHS COMPLETE before simultaneously releasing all IHS SYNC
signals to allow the torches to ignite.
For single torch installations, this signal is not required.
Motion
This signal is an output from the PHC and an input to the CNC. The signal is issued after plasma ignition and
the PHC set pierce delay time. It indicates to the CNC that the pierce delay is complete and the cut motion
should begin. If the CNC performs all pierce delay timing, the EXT_PIERCE_DELAY - DIP switch on the PHC
should be turned ON which forces the PHC pierce delay to be zero and disables the front panel pierce delay
control. If the CNC is controlling the pierce delay, the CNC uses the AUTO_DISABLE / HOLD signal to delay
the arc voltage control until the pierce and accel times have elapsed.
Retract Complete
This signal is an output from the PHC that is active when a cut has been completed and the torch has been
retracted to the selected retract height. The CNC can use this signal to delay rapid transit to the next cut until
the torch has been raised and cleared any tip-ups. The use of this signal is optional.
Error
This signal is output by the PHC for errors. The actual error number displays on the PHC front panel LED
display.
Interlock
This is a normally closed contact closure provided by the CNC to allow PHC motion. If this contact is opened,
the PHC motor drive does not receive power.
NOTE: This signal is required for operation of the PHC. If this signal is not used as an external interlock,
use a jumper to satisfy the input.