MOTOROLA MVME162-243 Vibration clamp

The encoder section uses differential type inputs to interface with up to five independent incremental encoders. These inputs accept RS422 level quadrature signals. A quadrature encoder sends square wave type signals. When the shaft rotates at a constant velocity, the A and B outputs are square waves and are at the same frequency. However they are out of phase with each other by 90°. When the encoder shaft rotates in one direction, each A pulse leads the corresponding B pulse by 90°. When it rotates the other direction each A pulse lags its B pulse by 90°.

The signals illustrated in Figure 21 indicate

that the encoder shaft rotates in one direction at first. Its speed of rotation decreases to 0 and then it starts rotating the other direction. The signals are shown as differential. A is the inverse of the signal A and B is the inverse of signal B.The maximum input frequency is 250,000 lines per second, which results in 1,000,000 Feedback Units (FUs) per second.The module counts positive and negative transitions at both channel A and channel B. One quadrature cycle in this case gives 4 Feedback Units.

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