ABB Advant Controller 450 User Manual

Advant
®
Controller 450 User’s Guide
Chapter 5 Maintenance
5-36 3BSE 002 415R701 Rev A
Typical Simple Scenario
A typical simple scenario
for a network connected controller follows.
1. A system message appears on the operator station display screen. The message is:
fatal error in I/O board, data base item designation XX.
You can find cross-references to board type and physical location in the data base
documentation and the equipment delivery documentation.
2. One or several process alarms appear as a consequence.
3. The system status display for the actual controller (node) shows the status of the faulty
board.
4. In the controller or I/O cabinet, the board in question indicates red LED FAULT.
5. Replace the board on-line, that is when the controller is in full operation otherwise.
See the sections below for safety regulations and instructions on how to replace an I/O board.
Other replacement instructions, of course, apply in other situations.
A Complex Scenario
The system diagnostics does not always point out a replaceable unit. Fault finding must be done.
In, for example, a stand-alone system, the following may happen:
1. An audible alarm initialized by the run/alarm relay indicates controller shut-down.
2. If installed in any redundant system, process alarm and process shut-down indications
appear as a consequence.
3. In the controller cabinet, perhaps a complex indication exists. Different red LEDs light up.
An halt code is shown on the processor module character display.
4. The fault is classified by you with respect to the indications. See Section 5.5.4, Fault
Classification and Scheme of Measures.
5. Outgoing from the fault classification you will probably proceed with advanced fault
finding. Some hints and general fault finding procedures are given in the following
sections. However practical experiences from a training course is normally needed to get
to the source of failure.
6. When localized, the faulty module is replaced.
Common user repair is described in Section 5.5.10, User Repair.
7. For instructions for restarting a system after a fault is corrected, see
Section 5.5.16, System Restart, INIT.
A general rule when dealing with complex indications is:
A fault indication in a superior function makes indications in subordinated functions
mostly inapplicable.
For example, if the processor module indicates red FAULT, there is probably no relevance in
any red FAULT indications on communication modules.

ABB Advant Controller 450 Specifications

General

Brand	ABB
Model	Advant Controller 450
Category	Controller
Language	English