ABB Advant Controller 450 User Manual

Advant
®
Controller 450 User’s Guide
Section 5.5.10 User Repair
3BSE 002 415R701 Rev A 5-53
5.5.10 User Repair
5.5.10.1 Board and Subrack Mounted Unit Exchange
General
In the following text, the word “board” also includes circuit board and rack mounted unit
(applicable). An example of such a unit is a voltage regulator or backup power supply.
It is important to understand the consequences of a board exchange on-line and how it affects
the current situation, for example:
• Replacement of an I/O board affects all channels on the board. It also sometimes indirectly
affects the outputs via an application function, for example, a closed loop control.
• Replacement of a communication board type CI531 affects both channels on the board.
Before output boards (both analog and digital) are replaced, it is preferable to separate the
different outputs from the process, that is, open terminal switches on the connection units (or
take other adequate measures). In some applications, this is an absolute requirement for safety
reasons.
The system software in Advant Controller 450 checks automatically that all I/O boards function
correctly. In the event of board fault, and board exchange, the board and associated signals are
marked as faulty in the data base. While the fault marking persists, the value (VALUE) is not
updated in the data base.
The system software checks that the board is inserted and correct. If this is the case, the fault-
diode extinguishes (after 10 s), the fault marking in the data base is reset and the board resumes
its normal function.
Under the following headings, you can find general instructions for replacement of circuit
boards and information on the handling of individual circuit boards.
Practical Execution
Replace faulty or suspect circuit boards and units as described below.
1. Do not forget to read Section 5.5.6, Safety Regulations.
2. Look under the heading Additional Aspects of Individual Board Types, below, for other
useful information.
3. Special restrictions apply to the board type DSBC 174 or DSBC 176, bus repeater in the
S100 I/O bus extension.
CAUTION
You cannot replace DSBC 174 or DSBC 176 with the voltage switched on,
when used in single S100 I/O Bus Extension configuration.
4. If necessary, switch off the power supply to the Advant Controller. Then keep the start
mode switch on the front of the processor module in the AUTO position.
5. Provide access to the board/unit by loosening the locking mechanisms:
– The bar in front of the boards (I/O subrack).
– The screws in the handles (controller subrack). First disconnect all cables.

ABB Advant Controller 450 Specifications

General

Brand	ABB
Model	Advant Controller 450
Category	Controller
Language	English