A40i, A60i
APPENDIX Manual 0-5466
A-6
APPENDIX 6: Automation Interface
The Automation Interface PCB with Ohmic Sense features several selectable divided voltage ratios. The divided
output signal is isolated allowing connection of either signal polarity to ground. The board also has Plate Contact
“Ohmic” sensing for use with the iHC XT and iCNC height controls via either the exposed torch tip (selectable)
or via a separate connection to the torch shield cup using the available sensing clip. The ohmic sensing can also
provide collision sensing when used with the iHC XT or iCNC. The plate contact output is a normally open relay
contact which may be adapted for use with other height controls as well.
Signals at the CNC connector (J1 on this board) are START / STOP on J1-3 (common) and J1-4 (+); Isolated & Di-
vided Arc voltage on J1-5 (-) and J1-6 (+); PLATE CONTACT OUT (relay contact) between J1-10 and J1-11; OK TO
MOVE OUT (relay contact) between J1-12 and J1-14.
Also available are ¼” “Faston” tabs for access to negative Arc Voltage (J3) and Work (J4).
Voltage divider;
The 6 position DIP switch, SW3, makes available the following divide ratios: Only one position should be on at a time.
SW3-1 ON = 80:1 for TD iHC;
SW3-2 ON = 50:1 for IHT, SC3000 & 3100, Hypertherm; (Factory Setting)
SW3-3 ON = 40:1 for Inova;
SW3-4 ON = 30:1;
SW3-5 ON = 20:1 for ESAB;
SW3-6 in spare.
SW3 all OFF = 16.7:1 for SC11.
Divided arc voltage signal is isolated, either the positive signal (J1-6) or negative signal (J1-5) may be grounded or
both can be floating. Load impedance for the divided signal should not be less than 10K ohms or signal accuracy
will be reduced.
Ohmic sensing and Collision via shield cup Ohmic Clip.
The CNC cable for this Automation Interface PCB includes a connection to pin 13 which can be connected to a
wire from the ohmic clip. When the shield cup, with contact from the ohmic clip, contacts work it closes the relay
between J1-10 and J1-11 providing the PLATE CONTACT OUT signal.
This may be used during height finding to detect the location of the plate. During cutting the plate contact signal
may be used to detect collision.
Ohmic Sense via exposed TIP:
The factory default position of SW2 is OFF which disables the exposed tip ohmic sensing.
With SW2 turned ON and the plasma is idle, neither START to the plasma nor OK to MOVE is active, the exposed
torch tip contacting the work will activate the Plate Contact relay closing the contacts at J1-10 and J1-11.
Collision Sense via exposed TIP:
The factory default position of SW1 is OFF which disables the exposed tip collision sensing.
With SW1 turned ON and OK to Move active, i.e. you have a transferred cutting arc, if the exposed torch tip contacts
the work it will activate the Plate Contact relay closing the contacts at J1-10 and J1-11.
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