Rockwell Automation 1395 Reel Tension Paster Adapter - Manual (Page 46)

Publication 1395-RTP-5.1 - September 1997
4-6 Troubleshooting
Message: CA–76–GLOBAL DATA NODE LOSS (CHA)
CA–91–GLOBAL DATA NODE LOSS (CHB)
Fault Type: Soft/Warning
Cause: Global data was being received from node address and
has ceased.
Action: Check configuration Parameter for correct global data
node address, verify node address is on the network. If
condition persists, replace adapter board.
Message: CA–77–COMM LOSS, NETWORK DEAD (CHA)
CA–92–COMM LOSS, NETWORK DEAD (CHB)
Fault Type: Soft
Action: Check wiring and connections, replace MCA board if
condition persists.
Press Speed, Magnetic Pickup Important: The magnetic pickup signal is summed with the pulse
generator for the emulate signal in the GSD console
panel. As a result, when the Drive is in the emulate
mode, the magnetic pickup and associated circuitry are
not part of the system.
One of the possible areas of concern is the press speed magnetic
pickup. The device is normally located directly overhead of the
respective RTP Drive of interest. The magnetic pickup has an
adjustment procedure which will allow the mechanical movement of
the position of the sensor which also adjusts the device output voltage
magnitude at a given press speed.
The problem will exhibit itself in poor performance of the dancer
relative to position tracking at a given maximum press speed. Once
this speed is reached, the dancer performance will continue to
degrade until the system will cause web out with the dancer either too
high or too low. The problem can be observed in its early stages or at
lower press speed by the sudden movement of the dancer (usually
downward), followed by dancer recovery. The Drive control variable
which can be used to observe this phenomenon is process trim output.
The process trim output will vary, but the variance due to the
magnetic pickup device will be exhibited in erratic behavior which
will begin occurring at some high press speed. The dancer may also
move downward without recovery. While press is running at a thread
speed, monitor Parameter 154, Velocity Reference Whole. If the value
remains at zero, stop the press and calibrate the magnetic pickup. This
should be accomplished with the use of an oscilloscope to observe a
50/50 duty cycle.
Once the problem has been identified, try not to run the press above
this threshold of speed until the pickup can be properly aligned and
verified for proper operation.