Acu-rite 200S User Manual download pdf (Page 19)

200S 5

I - 1 Fundamentals of Positioning

Encoder Reference Marks

Encoders normally contain one or more reference marks which the

200S Reference Mark Evaluation feature uses to re-establish datum

positions after a power interruption. There are two main options

available for reference marks; fixed and distance-coded.

Position Trac (Distance-coded reference marks): Encoders that have

marks separated by a specific encryption pattern allows the 200S to

use any two pair of marks along the length of the encoder to re-

establish the prior datums. This configuration means that the operator

only has to travel less than two inches any where along the encoder,

to re-establish the datums when the 200S is turned back on.

Fixed reference marks: Encoders that have one or more marks on

fixed intervals, have to re-establish the datums correctly. It is

necessary to use the same exact reference mark, during the

Reference Mark Evaluation routine, that was used when the datum

was first established.

The established datums’ cannot be restored from one

power cycle to the next if the reference marks were not

crossed before the datums were set

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Acu-rite 200S User Manual Page 19