Tweco 200 XT Auto-Cut 400V - Manual (Page 86)

AUTO-CUT 200 XT
A-4 APPENDIX Manual 0-5284
Divided Arc Voltage output — Arc Voltage signal is isolated from plasma supply, however (-) is common with
other isolated CNC signals. Max Divided Arc Voltage signal level depends on actual arc voltage times divide ratio
however can not exceed approximately 12 V.
3 Analog Current Control input — Analog Current Control includes analog isolation module, separate isolation
module not usually required however it’s low input is common with the other isolated CNC inputs. Scaling of
Analog Current Control input is 0V = 0A, 10V. = MAX output and is linear in between. However MIN output is 5A.
User is responsible for setting correct analog voltage to maintain at least 5A output. To use Analog Current Control
on the I/O PCB set SW 11 to down position and on the CPU PCB set SW8-2 ON (up).
Hold Start input —Normally open, close to hold start. Circuit rating 10 ma. @ 20VDC. Delays pilot ignition, gas
preflow continues. Used by some height controls to flow gas while finding height. Also used for synchronizing starts
when multiple plasma supplies are used on same cutting table. User supplies circuit to keep Hold Start inputs ac-
tive until all torches have found height. Used with CNC START. Apply START to begin gas flow. Same time apply
HOLD to delay ignition until height is found. Remove HOLD to ignite pilot, initiate arc transfer.
Preflow On input — Normally open, close to start preflow prior to normal START signal. Circuit rating 10 ma. @
20VDC. Torch Height Controls (THC) normally issue START signal to plasma supply after torch height has been
found. Then the plasma takes 1-2 seconds (or more) to perform preflow before igniting pilot. Some THCs have an
output that can start preflow early during height finding saving 1-2 seconds on each cut. PREFLOW ON should
remain active for at least 1 second after CNC START is applied. It is OK if it remains on until the end of the cut.
Need to recycle it to begin a new preflow prior to applying START for the next cut.
Pilot On output – Relay contacts rated 1A @ 120 VAC / 28 VDC. Contacts close when pilot on. Can be wired parallel
with Ok to Move contacts to start machine motion when pilot established. Used when starting over holes. Starting
over holes requires setting SW8-1 ON (up) on the CPU PCB for extended pilot time. Using extended pilot time to
start over holes or for cutting over holes will reduce parts life.
OK to Move output — Active when cutting arc is established, arc is transferred. Used to signal cutting table to
start X-Y motion. Relay contacts rated 1A @ 120 VAC or 28 VDC when SW6 set for contacts. When SW6 is set
for DCV, output supplies 15-18 VDC @ 100 ma. May be wired parallel with Pilot On to start cutting machine mo-
tion as soon as pilot established.Remote Selection of Plasma Marking (input)--- Plasma marking is not available
with the Auto-cut.
5 OK to Move2 – Provides a second set of N.O. contacts that close when arc transfer is detected. Contacts are rated
for maximum of 24 VAC/DC @ 1A. Simplified CNC Circuit.
5 +10V @ 10ma. For Remote CC Pot – Previously CCM versions if one wanted to use a potentiometer for the Remote
Analog Current Control (CC) input an external 10 V supply was required for Pot High.. Now an isolated (from main
plasma circuits) 10V supply is provided. Recommended value of the pot is 5K or 10K.
Ext. +10V
11
10
9
TB1
+10V
WIPER
Art # A-09246
Remote Selection of Plasma Marking (input) --- Plasma marking is not available with the Auto-cut.
The following functions may not yet be available on your system. *
*Corner Current Reduction (input) --- When activated, normally from a table controller’s corner or height control
inhibit signal, signaling that the cutting speed is being reduced to navigate a corner or small radius, the cutting
current is reduced at a fixed rate to a predetermined level to provide an improved cut at the lower speed.
*Cut Expanded Metal (input) ---Normally the plasma supply is optimized for pierce cutting, high pierce height
directly above the metal to be cut, short pilot time, etc. Activating this input adjusts the plasma supply to optimize
it’s parameters for cutting expanded metal, perforated metal, running edge starting, etc. Among other changes
the transfer height is reduced to same as cut height. In addition to activating the Cut Expanded Metal input CCM
switch SW1-1 should be turned on automatically restart the pilot and SW8-1 set on for longer pilot time.
*Spare contacts --- .