Signal Characteristic Of The Encoder; Evaluation Of The Zero Signal - KEB COMBIVERT F5 Handbuch

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1.7.2 Signal Characteristic of the Encoder

At this TTL-encoder interface the signals A+ and B+ are electrically phase-shifted by 90°

rectangular signals with the respective inverted tracks A- and B-.

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Figure 1.7.2

The zero impulse is required to determine valid position points. In case of pure speed controls

the signal does not need to be connected. In the following signal sequence the maximum

permissible length of the zero impulse of the encoder is visible. The zero signal will be acquired

if A+ ,B+ and N+ are at high level. By that there is only one valid position point which is

independent from the travel direction.

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Figure 1.7.3

1...16383 Inc (Recommendation: 2500 Inc at rotary

speed < 4500 rpm

Signal tracks A+ and B+

Evaluation of the Zero Signal

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