Evaluation Of The Zero Signal; Encoder Breakage Recognition - KEB Combivert F5 Instruction Manual

3.2.4.2

Evaluation of the Zero Signal

The zero impulse is required to determine valid position points. In case of pure speed con-
trols the signal does not need to be connected. In the following signal sequence the maxi-
mum 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.
Evaluation of the Zero Signal
3.2.5

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 (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.
Parameter
Ec.42
Dependent on Ec.42 „Error! Encoder 1" (value 32) or a warning is triggered, if the permis-
sible signal levels are fallen below.
Setting range
+A
+B
+N
max
N
Encoder alarm mode
Setting
0
1
1
2
3
Safety Instructions
Meaning
Encoder monitoring off
Encoder monitoring on
Encoder monitoring on (open-loop off)
Warning
t
r/w Enter prog.
yes no no
GB - 9