Fault 28 – Serial 1 Err; Faults 31…33 – Efb1…Efb3; Intermittent Off-Line Occurrences - ABB ACS550-01 User Manual

ACS550 User's Manual
Fault 28 – Serial 1 Err
If the drive's control panel shows fault code 28 "
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
Faults 31...33 – EFB1...EFB3
The three EFB fault codes listed for the drive in "Diagnostics" starting on page 200
(fault codes 31...33) are not used.

Intermittent Off-line Occurrences

The problems described above are the most common problems encountered with
ACS550 serial communication. Intermittent problems might also be caused by:
• Marginally loose connections,
• Wear on wires caused by equipment vibrations,
• Insufficient grounding and shielding on both the devices and on the
communication cables.
1 ", check for either of the
SERIAL ERR
.
COMM FAULT TIME
159
Embedded Fieldbus