Tweco 100 Auto-Cut - Manual (Page 116)

APPENDIX A-8 Manual 0-4764
CNC Input / Output Descriptions
E-Stop input— Requires closed connection rated for 35ma. @ 20VDC for unit to operate. Factory installed jumper between
TB1-1&2 must be removing when connecting user supplied E-Stop circuit.
4 Start/Stop input—Switch (momentary or sustained) rating 35ma. @ 20 VDC
Start / Stop circuit configurations. Momentary Start / Stop (Latched) is only available at TB1.
MOMENTARY START / STOP
START / STOP
TB1-6
TB1-5
TB1-4
SUSTAINED START / STOP
START
STOP
TB1-5
TB1-6
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 10A. User is responsible for setting correct analog voltage to maintain at least
10A 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 igni-
tion, gas preflow continues. Used for synchronizing starts when multiple plasma supplies are used on same
cutting table. User supplies circuit to keep Hold Start inputs active until all torches have found height.
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 pre-
flow before igniting pilot. Some THCs have an output that can start preflow early during height finding
saving 1-2 seconds on each 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 motion as soon as pilot established.