ABB ACH550-BCR, User Manual

Page: 452 / 642

2-106 ACH550 E-Clipse Bypass User’s Manual
Embedded fieldbus
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 3028 –
EXT COMM LOSS
If the bypass’ control panel shows fault code 3028 “EXT COMM LOSS”, 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 bypass.
• The time-out selection for the bypass is too short for the given installation. The
master is not polling the bypass within the specified time-out delay. To correct,
increase the time set by parameter 3005 COMM TIME.