Tweco 400 Ultra-Cut(October 2014) - Manual (Page 61)

ULTRA-CUT 100 XT/200 XT/300 XT/400 XT
Manual 0-5264 INSTALLATION 3-35
3.24 Voltage Divider for iHC Torch Height Control
For best plasma cutting performance it is necessary to maintain a constant height (standoff) above the metal while
cutting. Cutting tables use a Torch Height Control (THC), also called a Z axis control, most of which use feedback
from the arc voltage to control the height. Several of these, including the iHC, part of the Victor Technologies XT
CNC Controller, come with a Voltage Divider Printed Circuit Board that has to be installed inside the plasma power
supply to divide the high arc voltage down to lower levels for use with control circuits.
There is a space for mounting the V-D Board located on the upper portion of an internal vertical panel near the rear
of the power supply. Predrilled holes for mounting the iHT V-D board as well as another popular height control
are provided.
CAUTION
If using another board that doesn’t align with the existing holes, remove the panel if possible before
drilling. If not possible then every precaution must be taken to keep metal filings from being deposited
inside the power supply.
Install the V-D Board.
1. Locate the V-D Board which should be with the iCNC.
2. Inside the Power Supply, locate and remove the mounting panel’s 2 screws and panel.
3. Install the V-D board standoffs and the V-D Board from the XT iCNC then reattach the panel with the 2 screws,
securing the V-D board in place. If using another V-D Board, follow the instructions provided mounting it
in this same location.
Space for V-D Board Ohmic clip cable port
V-D Board connection
V-D Board installed
Art # A-12079
V-D Board shown with optional wire harness for iHC controller
Control Cable.
The iHC board can be supplied with a wire harness and connector (shown in previous image), to be installed in
the rear panel hole labeled “Height Control” . The connector mates with a cable from the iHC. For other height
control V-D boards a strain relief can be installed in this hole for those cables. Refer to Appendix for wiring diagram.