Operating Principle (Setting Example) - IFM Electronic ecomot200 DS2005 Notice D'utilisation

FS-2/FS-2N monitors have a one channel design. By means of an electrical
connection of the outputs of two or several units to achieve a redundant cir-
cuit, they can also be used for safety tasks. The applicable technical standards
must be adhered to.

3. Operating principle (setting example)

To avoid the differential pulses adding up to the limit value/switch point if an
uncritical slip occurs several times over a long period they are regularly reset by the
adjustable reset time.
Only in case of critical slip or blocking is the allowed number of differential pulses
exceeded within the reset time and the monitor switches.
Differential pulses are generated by:
• Blocking = maximum rotational speed difference in few ms
• Overload = small rotational speed difference over a longer period.
Setting example
System parameters for synchronous running
Rotational speed of the drive:
Switching cam:
Pulses for synchronous running:
Pulse difference:
Power take-off side blocked
Rotational speed of the drive:
Rotational speed of the power take-off side: 0 RPM
Rotational speed difference:
Pulse difference:
Drive side overload
Rotational speed of the drive:
Rotational speed of the power take-off side: 1440 RPM
Rotational speed difference:
Pulse difference:
Parameter values for overload and blocking of the power take-off side
Number of the differential pulses (SPx)
Reset time (CTx)
The length of the reset time also depends on the allowed rotational speed differ-
ence and the data of the clutch.
In principle it can be said:
The monitoring sensitivity increases when the reset time is prolonged for an identi-
cal number of differential pulses.
1500 RPM
2 per revolution on the drive and power take-off side
3000 pulses/min at both inputs (= 50 pulses/s),
0 RPM
1500 RPM
1500 RPM
3000 pulses/min (= 50 differential pulses/s)
1500 RPM
60 RPM
120 pulses/min (= 2 differential pulses/s)
2 pulses/s
1,0 s
(or a multiple, e.g. 6 differential pulses in 3.0 s)
FS-2 / FS-2N
MONITOR
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