PLCs, DCSs & Controllers


Dynamics and accuracy

June 2008 PLCs, DCSs & Controllers

The Temposonics R-Series SSI position sensor offers optimum control functionality for dynamic control in closed loops. Magnetostrictive technology, developed by MTS, and improved electronics in the sensor head ensure precise measurement signals within the millisecond range.

The new sensor communicates position, speed and position difference measurements synchronously or asynchronously according to SSI standard. In the synchronous mode, the measurement frequency is determined by the scanning cycle of the control system and can be as high as 3,7 kHz, depending on measurement length. The sensor signal quality permits dynamic control with a minimum, constant delay.

Dependent on application and performance, the new asynchronous mode can be used as an alternative. In this mode, the sensor operates free-running – ie, independent of the control system’s scanning cycle – while the integrated electronics circuitry employs prediction-mode. The measurement cycles can be up to 10 kHz, this mode demonstrates the high speed capabilities of the SSI sensor.

The sensors permit absolute, non-contact measurement with resolution of up to one micrometer. Due to the rugged construction and EMI protection, the data transfer is protected against interference and insensitive to external influences such as shock, vibration, humidity and dust.

All sensor parameters are factory-set and if the need for subsequent readjustment arises, this can be done onsite using a purpose built PC programmer supplied with the unit.



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