300 Fieldbus control
Loss of communication
The AC320 behavior, if communication is lost, was configured in Communication
fault. The parameters are 3018 COMM FAULT FUNC and 3019 COMM FAULT TIME.
Section Parameter listing describes these parameter.
No master station on line
If no master station is on line: Neither the EFB OK MESSAGES nor the errors (5307
EFB CRC ERRORS and 5308 EFB UART ERRORS) increase on any of the stations.
To correct:
• Check that a network master is connected and properly programmed on the
network.
• Verify that the cable is connected, and is not cut or short circuited.
Duplicate stations
If two or more stations have duplicate numbers:
• Two or more drives cannot be addressed.
• Every time there is a read or write to one particular station, the value for 5307 EFB
CRC ERRORS or 5308 EFB UART ERRORS advances.
To correct: Check all station numbers and edit conflicting values.
Swapped wires
If the communication wires are swapped (terminal A on one drive is connected to
terminal B on another):
• The value of 5306 EFB OK MESSAGES does not advance.
• The values of 5307 EFB CRC ERRORS and 5308 EFB UART ERRORS are
advancing.
To correct: Check that the EIA-485 lines are not swapped.
Fault 28 – Serial 1 Err
If the drive’s control panel shows fault 0028 SERIAL 1 ERR, check for either of the
following:
• The master system is down. To correct, resolve problem with master system.
• The communication connection is bad. To correct, check communication
connection at the drive.
• The time-out selection for the drive is too short for the given installation. The
master is not polling the drive within the specified time-out delay. To correct,
increase the time set by parameter 3019 COMM FAULT TIME.
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