Basics of Incremental Encoders with RS422 Sense (EN)

email: sales@impulseautomation.co.uk web: www.impulseautomation.co.uk Information shown in these data sheets are for guidance purposes only, no liability is accepted for any errors or omissions. The designer or user is solely responsible for the safe and proper use of these parts, assemblies or equipment described. OUTPUT CIRCUIT FUNCTION Basics of Incremental Encoders Outputs - Sense at 5 V RS 422 (T) 1 Voltage drop due to long cable lengths 2 Automatic readjustment of the output voltage (only for power packs with sense input) The sense wires enable measuring of the actual encoder supply voltage (compensates for voltage drops due to supply current and cable resistance).

Due to the voltage drop in the cables and the voltage supply, the encoder input voltage U in is less than the power pack output voltage U . out The present input voltage U is now output to the Sense V and Sense GND cables and in CC returns as data to the power pack. The input resistance R on the power pack should amount to at least 22 MOhm so that no i voltage drop occurs on these cables. In case of power packs with sense input, it is now possible to readjust the output voltage U out automatically. Doc No: EB0005 Rev: 001 Impulse Automation Limited United Kingdom Company Registration 665193 Page 2015-03-10 1

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