Tweco 300 XT Ultra-Cut Plasma Cutting System - Manual (Page 173)

ULTRA-CUT 300 XT
Manual 0�5�7� PPENDIX �67
3. On the Relay board D��, CONTCTOR ON LED (green) next to relay K1 lights if K1 is being told to energize.
a. If it’s on check for 1�0 VC between J8�1 and J8�9. If present the relay board is OK.
b. If D�� is on but 1�0 VC is not present at J8�1 and J8�9 (make sure meter is set for CV) then the relay
board is defective.
c. D�� is not on, go to the �0 pin ribbon cable test connector and measure voltage on pin 17 (relative to
TP1 on either the Relay board or the CCM I/O Board). It should be low, less than 1 volt. If it is the relay
board is likely bad. If it’s high, about ��VDC then the CCM may be bad, not telling the contactor to turn
on.
�. The inverter section may be defective with a bad bias supply. Swap the inverter end of the ribbon cable with
one next to it.
a. If it now reports a different code, that of the inverter that was swapped with, then the original section is
bad.
b. If it still reports the same section even though the ribbon cable was swapped then the CCM is bad.
271 Inverter ID Reading Fault.
Refer to section for codes ��5��30 for a description of the ID signals. If this code appears it means one of these
ID signals has gone false some time after power up.
Possible causes:
• An intermittent ribbon cable or one not fully latched in place.
• EMI interference.
Troubleshooting:
1. First recycle power to see if the fault is still there. It may now show up as one of the ��5��30 codes which
will indicate which inverter.
�. Determine when the code shows up. If it is EMI it may not happen every time but if, when it happens, it is
always at the beginning of piloting, it may be EMI interference. Check the system ground cables and if an
C�00XT check the torch shield connection to the unit rear panel.
3. If it happens intermittently during cutting or idling it might be an intermittent ribbon cable. This code does
not say which inverter section so you have to check each ribbon cable for proper connection on each end. It’s
highly unlikely for a ribbon cable to be intermittent but if you have more than � sections try disconnecting
one section at a time and cut at lower current. See if you find one that causes the problem and if so replace
that ribbon cable.
Group 3 codes relate to the GAS Controls Status and Communication Protocol
lso refer to GCM �010 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 CNBUS this code would indicate the Gas Control is having commu�
nication problems while the other CNBUS devices are OK. We don’t currently have any other devices on the
CNBUS 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