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• "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 AYK550 diagnostics information, see "Diagnostics" starting on page
212. The three most recent AYK550 faults are reported to the fieldbus as defined
below.
0401 Last Fault
0412 Previous Fault 1
0413 Previous Fault 2
1. Applies only for Modbus using YORK 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
and addressed to this drive).
• 5307
message CRC is received).
Serial Communication – EFB
Drive Parameter
advances (advances for each message properly received
EFB OK MESSAGES
does not advance at all (advances when an invalid
EFB CRC ERRORS
Protocol Reference
Modbus
N2
40401
17
40402
18
40403
19
AYK550-UH User's Manual
1
FLN
BACnet
90
91
92
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