Ultra Start 450 SERIES Manuel d'installation télécharger pdf (Page 263)

Publication 1398-5.2 – PDF 1997

Creating Custom Motor Files D-9

Feedback Parameters

Linecount

The encoder linecount, or size, specifies the number of encoder lines

per mechanical revolution of the motor, and is required in units of

lines/mechanical revolution. The linecount value can be in the range

from 100 to 15000 lines/rev.

Note that the linecount value is in units of lines/rev, rather than counts/

rev. The number of lines/rev will be 1/4th of the number of counts/rev.

Index Offset

The index offset specifies the offset of the encoder index signal from

the Allen-Bradley standard, and is required in units of electrical

degrees. If the startup commutation type specifies that the index be

used for the final commutation angle measurement, then the drive uses

the index offset to determine the commutation angle when the index is

first located (the rising edge). The index offset value can be in the

range from 0 to 359 degrees.

For custom motor files, this parameter is not required. Set it to 0, since

only the Hall signals are needed for most custom motor files.

Figure D.4(a) shows the Allen-Bradley standard index location, and

Figure D.4(b) shows an example of a 30

index offset.

Figure D.4 Index Offsets

Intro Intro

Intro

(a) Allen-Bradley Index Location (0

Offset) (b) Non-Standard Index Location (30

Offset)

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Ultra Start 450 SERIES Manuel d'installation Page 263