Emerson FM-3 Instalační manuál stáhnout pdf (Strana 33)

Operational Overview

The FM-3 calculates the distance required to move to the specified position from the current

position.

Absolute Index

Figure 23: Absolute Index Example 1

In the example above, the current position is 1 rev. If this index is initiated, the motor will

travel to a position of 5 revs no matter where it is sitting before the move. From 3 revs, it will

travel 2 revs to finish at 5 revs. If the absolute index to 5 revs is initiated a second time

immediately after the index, no motion will occur because the motor will already be at a

position of 5 revs.

The direction of an Absolute Index is determined by the starting position and the absolute

index position. If the starting position for the above index is 9 revs, then the motor will rotate

in the negative direction to end up at 5 revs. The diagram below shows this.

Figure 24: Absolute Index Example 2

Absolute indexes with Rotary Rollover enabled will take the shortest path to the position

entered in the index position parameter.

Note

Absolute indexes move to positions relative to where the machine was homed using the

Home, or the DefineHome destination.

Absolute Index

Start Position = 1 Rev

Index Position = 5 Revs

Absolute Index

Start Position = 9 Revs

Index Position = 5 Revs

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Emerson FM-3 Instalační manuál Strana 33