Daikin ACS320, Operation Manual

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Diagnostics – EFB
Fault Queue for Drive Diagnostics
The three most recent MD4 faults are reported to the fieldbus
as defined below.
Table 60: Fault Queue Protocol Reference
Drive Parameter
Protocol Reference
Modbus N2 FLN BACnet
0401 Last Fault 40401 17 90 AV18
0412 Previous Fault 1 40402 18 91 AV19
0413 Previous Fault 2 40403 19 92 AV20
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
application 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) .
• 5308 EFB UART ERRORS does not advance at all
(advances when character format errors are detected,
such as parity or framing errors) .
• 5309 EFB status value varies depending on network
traffic.
• BACnet protocol: 5316 EFB PAR 16 (MS/TP token
counter) advances for each token passed to this drive .
(Does not apply for other protocols .)
Loss of Communication
The MD4 behavior, if communication is lost, was configured
in Communication Fault . The parameters are 3018 COMM
FAULT FUNC and 3019 COMM FAULT TIME . The “Parameter
Descriptions” section in the ACH550 User’s Manual describes
these parameter .
No Master Station on Line
If no master station is on line: Neither the EFB OK MESSAGES
nor the errors (5307 EFB CRC ERRORS and 5308 EFB UART
ERRORS) increase on any of the stations .
To correct:
• Check that a network master is connected and properly
programmed on the network .
• Verify that the cable is connected, and is not cut or short
circuited .
Duplicate Stations
If two or more stations have duplicate numbers:
• Two or more drives cannot be addressed .
• Every time there is a read or write to one particular
station, the value for 5307 EFB CRC ERRORS or 5308
EFB UART ERRORS advances .
To correct:
Check all station numbers and edit conflicting values.
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