230 ACS550-02/U2 User’s Manual
Embedded fieldbus
Fault 28 – Serial 1 Err
If the drive’s control panel shows fault code 28,
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.
Faults 31…33 – EFB1…EFB3
The three EFB fault codes listed for the drive in chapter Diagnostics on page 273
(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.
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