KEB Combivert F5 Instruction Manual page 19

Encoder interface HTL input / HTL output
3.2.2.2 Evaluation of the zero signal
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. Input N+ must be connected with input
15/24 V if the encoder does not support a zero track.
Figure 2.2.2.2
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3.2.2.3 Encoder breakage recognition
For a monitoring of the encoder and the encoder cable the signal tracks and the zero track
are monitored. Input N+ must be connected with input 15/24 V if the connected encoder
should not have a zero track. The monitoring for channel 1 will be switched on/off with pa-
rameter Ec.42 (Ec.20 up to V2.8).
The recognition of encoder breakage triggers an „error! encoder 1" (value 32), if the voltage
at the signal input is smaller than 6 V.
Evaluation of the zero signal
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GB-9