Daikin ACS320 - Diagnostics - EFB; Fault Queue for Drive Diagnostics; Serial Communication Diagnostics; Diagnostic Situations

Diagnostics – EFB
Fault Queue for Drive Diagnostics
The three most recent MD4 faults are reported to the eldbus
as dened 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
trafc.
• 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 congured
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 conicting values.
fIeldbus ConTrols
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