Process interface aids drive measurements

LEM has added the PI1 process interface for its Norma power analyser family.

LEM has added the PI1 process interface for its Norma power analyser family.

The interface allows measurement of up to four speeds and torques simultaneously, quickly and precisely, and can calculate the mechanical power.

The Norma analyser measures the respective electrical power for the calculation of the efficiency under dynamic conditions.

It is not enough to measure the efficiency in a steady state, because the biggest losses usually occur during the starting and stopping phases of the drive.

Therefore electrical and mechanical power values must be measured very quickly and, above all, simultaneously.

This can be achieved with LEM's Norma 3000, Norma 4000 and Norma 5000 analysers.

Mechanical powers are sampled at 34kHz; electrical values at either 113kHz, 340kHz or 1.02MHz, according to the model.

Through the eight inputs for mechanical values, the system can measure multiple motor systems or conduct measurements before and after transmissions.

The efficiency can, therefore, be measured with a single measuring instrument.

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