Control Selector Function Block (Cs); Overview; Block Diagram; Description - ABB JDF300 Operating Instruction

42 J D F 3 0 0 | F I E L D I N D I C ATO R | O I/ J D F 3 0 0 - E N R E V. B

Control Selector Function Block (CS)

Overview

The control selector block is intended to select one of two or three control signals in a manner determined by SEL_TYPE, when the
block is in Auto mode. A different block, described in Part 3, is used for selecting a measurement from input or calculation blocks.

Block Diagram

Description

All inputs to the selector block are assumed to have the same scaling as OUT, since any one of them may be selected to be OUT.
Three separate BKCAL_SEL_N outputs are available, one for each SEL_N input. The status will indicate those inputs that are not
selected. Control blocks that are not selected are limited in one direction only, determined by the type of selector. The value of
each BKCAL_SEL_N output is the same as OUT. The limits of back calculation outputs corresponding to deselected inputs will be
high for a low selector and low for a high selector, or one of each for a mid selector.

Equations

With the SEL_TYPE it is possible select the following algorithms:
• High
• Low
• Middle

Configuration hints

The minimum configuration for having the CS working and/or moving out from the OOS needs at least the following settings:
• Set the SEL_TYPE with a valid value. It must be different from 0 and in the range 1 – 3
SEL_1
SEL_2
SEL_3
BKCAL_IN
SEL_1
Selection
SEL_2
SEL_TYPE
SEL_3
MODE
OUT
BKCAL_SEL1
CS
BKCAL_SEL2
BKCAL_SEL3
Output
OUT_HI_LIM
OUT_LO_LIM
Back Calc
OUT
BKCAL_SEL1
BKCAL_SEL2
BKCAL_SEL3