Diagnostic Situations; Normal Operation; Loss Of Communication; No Master Station On Line - ABB ACS550 User Manual

ACS550 User's Manual

Diagnostic situations

The sub-sections below describe various diagnostic situations – the problem
symptoms and corrective actions.

Normal operation

During normal network operation, 5306...5309 parameter values act as follows at
each drive:
• 5306
and addressed to this drive).
• 5307
message CRC is received).
• 5308
errors are detected, such as parity or framing errors).
• 5309

Loss of communication

The ACS550 behavior, if communication is lost, was configured earlier in section
Communication fault
3019
describes these parameters in detail.

No master station on line

If no master station is on line: Neither the
CRC ERRORS
To correct:
• Check that a network master is connected and properly programmed on the
network.
• Verify that the cable is connected and that it 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
CRC ERRORS
To correct: Verify the station numbers of all stations. Change conflicting station
numbers.
Swapped wires
If the communication wires are swapped (terminal A on one drive is connected to
terminal B on another):
• The value of 5306
• The values of 5307
To correct: Check that the RS-485 lines are not swapped.
advances (advances for each message properly received
EFB OK MESSAGES
does not advance at all (advances when an invalid
EFB CRC ERRORS
does not advance at all (advances when character format
EFB UART ERRORS
value varies depending on network traffic.
EFB STATUS
on page 196. The parameters are 3018
. Section
COMM FAULT TIME
and 5308
EFB UART ERRORS
or 5308
EFB UART ERRORS
EFB OK MESSAGES
EFB CRC ERRORS
Complete parameter descriptions
EFB OK MESSAGES
) increase on any of the stations.
advances.
does not advance.
and 5308
EFB UART ERRORS
199
and
COMM FAULT FUNC
on page 98
nor the errors (5307
EFB
EFB
are advancing.
Embedded fieldbus