ACS550 User’s Manual 159
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 "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.
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