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Encoder Output

Voltage sensing with the RS 422 (T)

ENCODER CIRCUIT

Design for Circuit Voltage Sensing with PowerPack Encoder

FUNCTION

The sense lines enable the measurement of the actual encoder voltage (without the distortion caused by voltage drops due to the supply current and cable resistance).

Due to the voltage drop in the cables for the supply voltage, the encoder input voltage Vin is less than the voltage output Vout from the power supply.

The input voltage Vin supplied to the encoder will then be output to the sense power supply voltage (VCC) and the sense ground (GND) lines and fed back to the power supply unit as data.

To prevent additional voltage drops on these sense lines, the input resistance (Ri) of the power supply unit must be at least 22 MΩ.

When using power supply units with sense input capability, the output voltage (Vout) can then be automatically readjusted to compensate for any voltage losses.