Tweco 20 O2 Auto-Cut - Manuel (Page 73)

Manual No. 0-4816 Auto-Cut 200
2
4-7 OPERATION
4.04 Gas Control Sequence Of Operation
Some operations vary depending on the revision of the gas control and it’s firmware (program). The gas control
revision is found on the data tag. GCM 2000 revision AC or later with firmware version 3.1 (or later) includes a
Status LED. Refer to table for Status LED codes.
LED Description
Steady
Gas control is ready to operate or is in cutting
sequence (preflow, pilot, cut or postflow)
Continuous
Blinking
Gas control is not ready. May be purging, mode
switch not in Run position or Gas Selection or
Mode switch in between positions
2 Blinks
Power Supply Enable/Disable switch in Disable
position.
3 Blinks
Gas supply pressure out of range. Must be
between 100 - 135 PSI
4 Blinks CANBus error, Unacknowledged message
5 Blinks CANBus error, Bus off
6 Blinks CANBus error, communication timed out.
STATUS LED Codes
Parts Change and Purge.
1. On the GCM set the Plasma Power Supply switch to .
2. Set Mode switch to RUN.
3. Inspect and change the torch parts if necessary.
4. Set the Gas Selection switch to the desired gas process.
5. Apply AC power and set the Plasma Power Supply switch (on the Gas Control Module)
to . The Module performs purges of coolant and gas from lines if new gas was selected.
6. Status LED blinks on/off during purge then on steady if Mode SW is in RUN position and inlet gas
pressure is OK.
Gas Supply Pressure.
For best results the gas supply pressure should be a minimum of 120 PSI and a maximum of 135 PSI. The following
process is for GCM 2000 systems with revision AC or after. These systems will have input pressure sensors.
1. Following the parts change and purge, if the inlet pressure is OK, (Status LED is on steady) proceed to the
next subsection of “Pressure and Flow Setting”.
2. If following the parts change and purge, the inlet pressure is not within the proper range of 100 to 135 PSI
the Status LED will repeatedly blink 3 times. Adjust the supply pressure as needed and set the Enable /
Disable switch to Disable then back to Enable to start another purge. Setting the Mode switch to “Set
Plasma & Shield” then back to “Run” will reset the pressure error code without purging the lines. Proceed
to next step to set pressures and flows.