Pack Expo 2002: Danaher Controls' absolute encoders stress resolution, reliability, compact package

Gurnee, IL - Absolute encoders provide more accurate feedback and useful information than incremental encoders, but in the past they were complex to install and configure, and cost substantially more.


Gurnee, IL - Absolute encoders provide more accurate feedback and useful information than incremental encoders, but in the past they were complex to install and configure, and cost substantially more.

A new series of compact absolute encoders from Danaher Controls seeks to change that image, while bringing higher resolution and novel reliability features to this product type. Dynapar Acuro single- and multi-turn encoders offer a choice of resolutions to suit the application, and are available in two basic versions. Acuro Industry provides up to 17-bit resolution in a single-turn configuration for various industrial and system engineering uses, while Acuro Drive delivers up to 22-bit resolution as a motor feedback device. In multi-turn configuration, each has 12-bit resolution. Power consumption at 5 V supply has been held to 45 mA and 85 mA max, respectively, for the single-turn and multi-turn versions.

Thanks to low profile gears, installation height is only 45 mm for the multi-turn version, making it lower than battery-buffered counter designs. Equipment space is a prime consideration to OEMs wishing to upgrade their machines. The nonmagnetic gearset is immune to EMI and is said to be maintenance-free at continuous speeds up to 12,000 rpm.

Reliability features

violation of this rule causes an alarm. An internal temperature sensor set by the user can trigger at an upper and lower limit, which is in the -40 to 100 °C range for Acuro Industry (-15 to 120 °C for Acuro Drive). Warning messages and an alarm are generated if the limits are exceeded.

Integrated data storage is another notable Acuro feature. It allows detection and parameterization of individual encoders in a machine system, thereby speeding up adjustment and assembly times. Data storage includes self-monitoring that checks encoder operating hours and sends a warning message to start preventive maintenance. Communication formats for these encoders range from parallel (gray or binary code) to networks such as Profibus, DeviceNet, CANopen, Interbus, and SSI. A 2,048-step sine/cosine signal (1 Vpp) is also available for dynamic control.

Acuro further simplifies the zero (home) position setting of a high-resolution encoder at startup. The reference position is determined electronically or via a push-button immediately after installation, without the need to turn the encoder shaft to a defined position.

Acuro absolute encoders had their show preview at Pack Expo in Chicago, Nov. 3-7, 2002. For more information, visit

Control Engineering Daily News Desk
Frank J. Bartos, executive editor

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