Emerson FM-3 Manual de instalación descargar pdf (Pagina 35)

Operational Overview

also be used to determine the validity of a registration trigger. If a registration trigger is

received outside of the registration window, it will be ignored.

Rotary Plus and Rotary Minus Indexes

Rotary Plus and Rotary Minus Indexes provide forced directional control of moves to

absolute positions. The position entered for a Rotary Plus or Minus type index must be within

the rotary range (i.e. 0 ≤ Position < Rotary Rollover Point). All other parameters function the

same as they do with absolute indexes. An Absolute Index is a direct move to a specific

position, regardless of the starting point. A Rotary Plus Index moves to the specified position,

but is forced in a positive direction. Similarly, a Rotary Minus index moves to the specific

position, but is forced in a negative direction.

Rotary Plus and Minus Indexes are usually used in rotary applications, therefore the rotary

rollover feature on the Setup - Position view in the PowerTools FM-3 software must be

enabled to use them.

1. In the following examples the term “D” = (absolute position specified) - (current

position). If “D” is negative, motion in the negative direction is implied.

2. In the following examples the Rotary Rollover parameter on the Setup - Position view is

set to 360.00°. This means that with each revolution of the motor (or rotary table),

feedback will count up to 359.99°, then roll over to Ø°.

Indexes with Rotary Rollover Enabled

Incremental move distances can be outside of the rotary rollover range. See the Setting

Up Parameters section for an explanation of Rotary Rollover.

Example 1: If the starting position is at Ø° and 720° is the specified distance, an

Incremental index would move 2 revolutions in the positive direction. At the completion

of this index the motor position would be Ø°.

Absolute indexes will take the shortest path to the specified position. Absolute index

positions must be within the rotary rollover range.

Example 2: If the starting position is at 90° and 80° is the specified position, an Absolute

index would travel 10° in the negative direction. At the completion of this index the

motor position would be 80°.

Example 3: If the starting postion is 45° and 315° is the specified postion, an Absolute

index would travel 90° in the negative direction because that is the shortest path between

45° and 315°.

Rotary Plus indexes will move to the specified position and are forced in a positive (or

plus) direction. Rotary Plus index distances must be within the rotary rollover range.

Example 4: As in example 2 above, the starting position is at 90° and 80° is the specified

position. A Rotary Plus index would travel 350° in the positive direction. At the

completion of this index the motor position would be 80°.

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Emerson FM-3 Manual de instalación Pagina 35