Tweco Troubleshooting Power Supply - Manual (Page 40)

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5-1 CANBUS Failure to Acknowledge fault.
• Gas control is GCM 1000 with Basic ID problem
• CANBUS / Fiber optic problem
GCM 1000 (also called a Basic Gas Control) does not use the CANBUS (fiber
optic) communication. A jumper in the gas control connector J56 pins 8 & 9, gives
the signal “Basic ID” telling the CCM not to expect any CANBUS. If this circuit,
Gas Control cable, connector pins, connection from the rear panel GCM connector
J55 to the CCM (J5) is open CCM will expect CANBUS and report this error
because there isn’t one.
CANBUS / Fiber optic communication errors can be difficult to troubleshoot,
especially when they are intermittent. Things to look for are:
• the connectors not locked in place (CCM or GCM)
• The fiber is damages or bent sharply. Should not be the case if the fiber in
inside the protective hose and the hose properly secured in the strain relief but
that is not always the case.
• Dirt on the ends of the fiber or in the receiver/transmitter where the fiber plugs
in. Blow out gently with clean dry air such as is used to clean camera lens.
• Excessive electrical interference. While the fiber is immune to EMI it can
bother circuits at either end. Check than that All the grounding connections
and clean and tight. Check the resistance of the ground rod (with all wires
disconnected from it). It may have increased due to dryer weather conditions.
• Defective receiver/transmitter or other circuits on either CCM or Gas Control
main board. For the CCM you can plug the fiber into another
receiver/transmitter pair to see if that works. Otherwise replace either (or
both) Gas Control main board or CCM.
5-2 CANBUS off due to excessive errors.
See 5-1 code for troubleshooting CANBUS faults.
5-3 CANBUS Data Error Warning.
This is a warning, does not shut the system down but is an indication that it
probably will shut down soon (5-2 code). Troubleshooting is same as for 5-1.
5-4 CCM message not sent.
Troubleshooting same as for 5-1.
Group 6 Codes
Starting in May 06 with V2.4 code, we've added code group 6. These were all supposed to
indicate CCM errors where you just replaced the CCM but we did find the coolant flow
upper limit of 2.7 gal/min can be exceeded if the coolant tube in the torch is missing or
broken off so it doesn’t restrict the flow.