Tweco Troubleshooting Power Supply - Manual (Page 33)

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Group 3, Gas Control Codes.
Also refer to Gas Control Status Codes at the end of this section.
3-1
Gas Control Communication Fault
No signal detected over the fiber optic link from the gas control.
In the case
where there are additional other than Gas Control connected to the CANBUS this
code would indicate the Gas Control is having communication problems while the
other CANBUS devises are OK. We don’t currently have any other devises on
the CANBUS so it is more likely that code 5-1 will be what is set. In any case
troubleshooting is the same as for 5-1.
3-2 Gas Control communications reply fault
Communication has been established but Gas Control did not reply to a request
from the CCM in the time allowed. Likely cause is Fiber optic problems (see
code 5-1) or if problem persists defective Gas Control main PCB.
3-3 Gas Pressure fault
With GCM 1000 gas pressure sensor is on plasma gas only but is in series with
Run /Set SW. 3-3 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_AG or GCM2000_AC we measure inlet pressure of
both plasma and shield gas immediately gas selection manifold. If pressure is either
too low or too high it sets 3-3 code. Earlier revs should not display 3-3 code.
GCM2010 will display which gas is the problem and its actual pressure. With GCM
2000 you have to figure it out. The pressure at the point where it is measured
should be in the range of 100-135 PSI. Except for shield gas if the Gas SW is set to
pressure then the min pressure can be 85 PSI.
In the Gas Control, on the main PCB, measure between test points TP1 (gnd)
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 SW 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 when you are measuring it.
3-4 Gas Control not ready
Code 3-4 combined with 2-4 & 4-2 when the Plasma Enable on the GCM 2000
or 2010 gas control is set to disable can indicate a fault in the CCM I/O PCB.
When switching back to Enabled the pump will not restart so continues to display
4-2 indicating no coolant flowing.
Normally the code during a disable should be 1-1. Circuits on the I/O PCB
detect the Plasma Enable is disabled and send signal to the microcontroller in the
CCM. If that signal doesn’t get passed the microcontroller doesn’t know the
system is disabled so it sets these other 3 codes.
3-5 Gas Control Protocol Error
Application error or firmware incompatibility fault. Consult factory for latest
firmware update.