Elmo DBP SERIES manual Setting the main optical encoder format, Setting the R/D circuit

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7.2 Setting the main optical encoder format

When a differential encoder is used:

Set DS 2,3,6 to OFF

Otherwise they should be ON.

7.3 Setting the R/D circuit

Set DS 2,3,6 to ON

The Resolver interface circuit consists of three basic blocks:

R/D converter

The R/D conversion is done by a variable resolution, monolithic converter type 2S82 of Analog Devices. It accepts two signals from the Resolver (sine and cos.) and converts them into binary position data bits. The resolution of the position bits is user selectable 10, 12 ,14 and 16 (only for standard encoder resolution). In addition, the R/D creates a signal that is proportional to the Resolver velocity. This signal is being used as a velocity feedback.

EPROM

The EPROM creates "Hall" signals by mapping the position data bits accepted from R/D into suitable Hall signals to operate a specific brushless motor. In addition, the encoder index (marker) signal is also produced from the EPROM. The EPROM is designated as follows:

2 4	X S STD
		Encoder resolution
Resolver's poles number
		Commutation address
		R/D resolution
Ratio of motor/resolver		X=User selectable, 0=10 bits
		2=12 bits, 4=14 bits, 6=16 bits
poles numbers

In the S (standard) version zero crossing of phases B C occurs at position address "0" of the Resolver.

DBP - Rev 6/93