Hypertherm PHC Sensor - Manual (Page 37)

Section 2: Installation and Setup 37
Plasma Start
This signal is a relay contact output from the PHC and an input the plasma power supply. The PHC activates
this signal by closing the contact to start the plasma power supply.
WARNING: An interface to older plasma systems, such as the MAX100 or MAX200 must be
implemented with a customer-supplied relay (see Figure 19). Older plasma systems draw large current
levels through the PLASMA START input that are far in excess of the capability of the Sensor PHC
START output.
Figure 19: Interfacing to Older Plasma Systems (MAX100 or MAX200)
Hold Ignition
This output from the PHC and input to the plasma power supply should be activated to delay the high
frequency ignition of mechanized torches. This signal is usually issued to synchronize the ignition of multiple
plasma torches. This signal can also be used to save cycle time by performing preflow during IHS. The use of
this signal is optional but improves performance on plasma systems that can use it. This signal is not used for
contact start torches installed on Powermax
®
plasma units.
Transfer
This signal is an output from the plasma power supply and an input the PHC. The plasma power supply
activates this output to signal that arc transfer has occurred.