Ultra Start 450 SERIES Installation Manual download pdf (Page 264)

Publication 1398-5.2 – PDF 1997

D-10 Creating Custom Motor Files

Hall Offset

The Hall offset specifies the offset of the Hall feedback signals

relative to the Allen-Bradley standard. The drive uses the Hall offset

to determine the commutation angle at startup. Hall offset is specified

as a value in the range from 0 to 359 electrical degrees.

The Hall signals, as well as the line-to-line back-EMF voltages, must

sequence according to the Allen-Bradley standard (refer to Figure D.2

and the “Motor Phasing” on page D-3). The Hall offset value is the

value the drive uses to correct for Hall signals that are shifted from the

line-to-line back-EMF.

Figure D.5(a) shows the Allen-Bradley standard for orientation of the

Hall signals to the line-to-line back-EMF voltages. Figure D.5(b)

shows an example of a 60

Hall offset from the standard location.

Startup Commutation

The startup commutation list box specifies the type of commutation to

be used at startup. The choices are:

● 6-Step ABS/Index,

● 8-Step ABS/Index,

● Hall/Index, and

● Hall/Hall.

The different types of startup are identified by their initial and final

commutation angle measurement. For example, the 6-Step ABS/Index

startup uses the 6-Step ABS for the initial commutation angle

measurement, and the index signal for the final commutation angle

measurement.

Figure D.5 Hall Offsets

Intro Intro

Intro

(a) Allen-Bradley Hall Location (0

Offset) (b) Non-Standard Hall Location (60

Offset)

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Ultra Start 450 SERIES Installation Manual Page 264