Tweco 400 Ultra-Cut XT Plasma Cutting System - Manual (Page 218)

ULTRA-CUT 100 XT/200 XT/300 XT/400 XT
A-84 APPENDIX Manual 0-5297
Group 3 codes relate to the GAS Controls Status and Communication Protocol
Also refer to GCM 2010 Status Codes at the end of this Group 3 codes section.
301 Gas Control Communication Fault
No signal detected over the fiber-optic link from the gas control. In the case where there are additional devices
other than Gas Control connected to the CANBUS this code would indicate the Gas Control is having commu-
nication problems while the other CANBUS devices are OK. We don’t currently have any other devices on the
CANBUS so it is more likely that code 501 will be what is set. In any case troubleshooting is the same as for 501.
Possible cause:
• Most likely cause is dirty or defective fiber-optic cable or connector.
• Cable to GCM 2010, DMC or DPC not connected or broken.
• Defective control board or power supply in the Gas Control
• Defective CCM
Troubleshooting:
1. Check that the fiber-optic cable is fully plugged in to both sockets. Clean the cable ends with a soft cloth
and blow out the sockets with air.
2. Check gas control cables. If any of the gas control cables are not connected there will be no communication
as there will be no power to the control. This may show up as a 301 or 501 code. Also if the cable is broken
or defective such that the gas control is not enabled it may have power but in the case of the DMC or DPC
its fault light will blink error 101 while the CCM will only detect that there is no communication and it will
show 301 or possibly 501.
302 Gas Control communications reply fault
Communication has been established but Gas Control did not reply to a request from the CCM in the time al-
lowed. Likely cause is Fiber-optic problems (see code 501) or if problem persists defective Gas Control main PCB.
303 Gas Pressure fault
Gas pressure faults only show up when you try to start the torch, not during purging or setting flows .
With the Auto-Cut 200 XT and the Auto-Cut 300 XT (GCM 1000 XT), the gas pressure sensor is only on the
plasma gas and is in series with Run/Set switch. A 303 code here indicates either plasma gas missing or very
low pressure, less than 50 PSI, or RUN/SET switch is in SET position.
Starting with GCM2010 revision AG we measure inlet pressure of both plasma and shield gas at the inlet of
the gas selection manifold. If pressure is either too low or too high it sets 303 code. Earlier revision should not
display 303 code. GCM2010 will display which gas is the problem and its actual pressure. The pressure at the
point where it is measured should be in the range of 100-135 PSI. Exception is for shield gas if the Gas switch
is set to Pressure then the min pressure can be 85 PSI.
In the GCM 2010 Gas Control, on the main PCB, measure between test points TP1 (ground) and TP18 (shield)
and TP19 (plasma) to measure the output of the pressure sensors. Voltage should be between 2.6V to 3.5V for
100-135 PSI. With shield switch set to pressure low limit is 2.1V. Whichever gas is outside those limits will
be the one causing the fault. Remember the pressure may drop during operation, set the code, then recover
displaying L303 when you are measuring it.
• To test for faulty pressure sensor or inadequate gas supply with too much restriction. On the GCM 2010
place the Mode switch to SET Plasma & Shield, turn the mechanical pressure regulators to max pressure
and compare mechanical gauges with the pressure display. If the pressure display doesn’t approximately
match the gauge the sensor is likely defective. If the gauge and the pressure display both show low pres-
sure the supply to the gas control has too much restriction. Perhaps the hose is too long or too small.
304 Gas Control not ready