6.4.2.2 Encoder Breakage Recognition - KEB COMBIVERT F5 Betriebsanleitung

Clock signal
Monoflop
Position data
Figure 4:

6.4.2.2 Encoder breakage recognition

An error bit is evaluated for monitoring of the encoder at channel 2. The monitoring is switched
on/off with parameter Ec.42 (Ec.20 up to V2.8). The encoder breakage recognition triggers an
„error! encoder 2" (value 34).
For encoder breakage detection the encoder needs to send a so-called Power failure bit and
the evaluation with Ec24 "SSI power failure bit" has to be enabled.
1
Data
P-1 P
P: Parallel position data
T: Period
Tp: Clock interruption up to the next request
tm: Pulse duration of the monoflop
tv: Deceleration time
D : Most significant position bit
high
D : Least significant position bit
low
Serial data transmission with SSI encoder
Description of the Interface
T
2
t
v
D D
-1
high high
P
P+1
3
t
m
D D
low+1 low
4
T
P
11