ABB Advant Controller 450 User Manual

Advant
®
Controller 450 User’s Guide
Chapter 5 Maintenance
5-40 3BSE 002 415R701 Rev A
5.5.9 List of General Fault Finding Procedures and Hints
5.5.9.1 Location of Malfunction
Sometimes you lack information from the controller diagnostics, telling you where the fault is
located. Suspicion about a fault is raised by the process behavior.
Experience indicates that approximately 85% of all faults occur in the process, 10% occur in the
control program and 5% occur in the control system hardware.
It is advisable for you to localize the malfunction with these figures in mind to minimize the
down-time.
5.5.9.2 External Factors
In an electronics system which has given satisfactory service, most malfunctions have external
causes. It is, therefore, important when you are tracing a fault to determine if any external factor
such as incorrect handling of the equipment, short circuits, welding work, lightning strike and/or
power failure has caused the malfunction.
5.5.9.3 Safety at Start/Stop
The Advant Controller 450 can perform the control functions while operating normally. Voltage
failure, component fault or manual restart usually affect the control system function. Control
system failure affects the process in different ways, more or less serious:
• In a control system with a monitoring character, changes in the process status are not
registered, but there is no immediate danger to the process.
• Control of continuous processes in, for example rolling mills and pulp and paper
manufacture demands a high degree of continuity of the control system function.
An uncontrolled restart of the Advant Controller 450 can have very serious consequences.
DANGER - CAUTION
It is important to be aware of the local requirements for safety when starting and stopping
the Advant Controller 450.
5.5.9.4 Manual Changeover between Redundant Processor Modules
For a demonstration of a changeover or if one suspect that a primary processor module is not
functioning to its full capacity, a manual changeover can be effected.
Manual Changeover
Prior to the Changeover. Check
• DUAL LED’s on both processor modules lit
• Start mode selector on both processor modules in the same position (for example AUTO)
• Primary processor module in working mode P1 or P2
(P1 = OPERATION, P2 = CONFIGURATION)

ABB Advant Controller 450 Specifications

General

Brand	ABB
Model	Advant Controller 450
Category	Controller
Language	English