IFM Electronic ecomat 200 FS-3 Notice D'utilisation page 34

FS-3 / FS-3N
MONITOR
Monitoring of shaft break or torsional strain
(see drawing, page 23)
System
Rotational speed of the shaft
Assignment shaft 1
Assignment shaft 2
Switching cams per shaft
Task
In case of a shaft break or a shaft misalignment ≥ 30° the monitor outputs are to switch and
remain in this switching state up to the reset.
Monitor parameters
FO 1/2 switching function
NC 1/2 number of switching cams
SP 1/2 number of differential pulses
HY1/2 number of hysteresis pulses
SOP latching function
General remarks
In this case the number of differential pulses is a measure of the torsion of the
shafts in relation to each other. The rotational speed of the shafts is important for
the monitoring because it determines how fast a fault can be signalled.
Furthermore the number of pulses per revolution is also decisive for the response
time. For example the following response time per set differential pulse results
from the above-mentioned values:
-1
600 min x 36 cams = 21600 pulses/min = 360 pulses/s
This results in: Pulse interval = 0.0028 s = approx. 3 ms
Switching operation
If e.g. there is more strain on shaft 2 output 1 switches in case of a shaft misalign-
ment ≥ 30° (this corresponds to 3 differential pulses).
According to the switching function the relay de-energises.
If shaft 2 is blocked input 1 counts 3 pulses more than input 2 within approx. 9 ms
and the output relay 1 switches.
According to the switching function the relay de-energises.
The activated latching function SOP maintains the relay in the fault state up to the
reset.
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example values
600 RPM
input 1
input 2
36 per revolution (e.g. shaft encoder)
4 (default value!)
36 (this corresponds to a resolution of 10°)
3 (this corresponds to a switching point at 30° shaft
misalignment)
1
1 or 2 (active)