ACH550-UH User’s Manual 153
Serial Communication – EFB
• "N2 Analog Input Objects" in the "N2 Protocol Technical Data" section.
• "Scaling Drive Feedback Values" in the "FLN Protocol Technical Data" section.
• TBD in the "BACnet Technical Data" section.
Diagnostics – EFB
Fault Queue for Drive Diagnostics
For general ACH550 diagnostics information, see "Diagnostics" starting on page
212. The three most recent ACH550 faults are reported to the fieldbus as defined
below.
1. Applies only for Modbus using ABB Drive profile.
2. BACnet not defined at time of publication.
Serial Communication Diagnostics
Network problems can be caused by multiple sources. Some of these sources are:
• Loose connections
• Incorrect wiring (including swapped wires)
• Bad grounding
• Duplicate station numbers
• Incorrect setup of drives or other devices on the network
The major diagnostic features for fault tracing on an EFB network include Group 53
EFB Protocol parameters 5306…5309. The "Parameter Descriptions" section
describes these parameters in detail.
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 EFB OK MESSAGES advances (advances for each message properly received
and addressed to this drive).
• 5307 EFB CRC ERRORS does not advance at all (advances when an invalid
message CRC is received).
Drive Parameter
Protocol Reference
Modbus N2 FLN BACnet
1
0401 Last Fault 40401 17 90
0412 Previous Fault 1 40402 18 91
0413 Previous Fault 2 40403 19 92
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