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Diagnostics – EFB

Fault Queue for Drive Diagnostics

For general ACH550 diagnostics information, see "Diagnostics" section in ACH550

User’s Manual. The three most recent ACH550 faults are reported to the fieldbus as

defined below.

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 in

ACH550 User’s Manual 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).

• 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.

Drive Parameter

Protocol Reference

Modbus N2 FLN

0401 Last Fault 40401 17 90

0412 Previous Fault 1 40402 18 91

0413 Previous Fault 2 40403 19 92

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 61 62

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ABB ACH550 Bedienungsanleitung Seite 16