Signal Tracks; Evaluation Of The Zero Signal; Encoder Breakage Recognition Channel 2 - KEB COMBIVERT f5 Betriebsanleitung

Encoder Interface Resolver / HTL Input
3.3.2.1

Signal tracks

In case of HTL encoder interface the signals A+ and B+ are rectangular signals with a
phase-angle displacement by 90 degrees. The inverted signals will be generated internally
and does not need to be provided by the encoder. The pulse width and the phase difference
must be 2 µs at least.
Figure 3.3.2.1
+A
COM
+B
COM
3.3.2.2

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 3.3.2.2
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3.3.2.3

Encoder breakage recognition channel 2

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 2 will be switched on/off with pa-
rameter Ec.42 (in the past Ec.20). The recognition of encoder breakage triggers an „error!
encoder 1" (value 32), if the voltage at the signal input is smaller than 6 V.
GB-12
Signal tracks A+ and B+
Phase diffe-
rence
Evaluation of the zero signal
Pulse width
Pulse width
15...30 V
0 V
15...30 V
0 V
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