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JMNC Operating Instructions
6 Setting the Rotational Speed Monitoring Device JMNC
6.2.3
Setting the Switch Point for Underspeed
Monitoring
Always select the higher pulse range, when the
required switch-off point is in the overlapping
area of the pulse selection switch (
2
) (example:
required switch-off point = 100 pulses/min., set
the pulse selection switch (
2
) into position II).
Note that the rotational speed monitoring device
processes pulses per minute and not rotations
per minute. You therefore have to multiply the ro-
tational speed of the drive by the indicated
number of pulses per rotation.
Item
Description
Indication/Action
1
Set the pulse selection switch (
2
) to the required
pulse range.
2
Press the red set button (
7
) and keep it pressed
during all following settings.
This is to bridge the switch point of the out-
put relay (
16
) during the setting.
3
Switch on the rotational speed monitoring device
and the drive.
The output relay (
16
) is attracted and the
plant starts up.
The green LED (
5
) lights.
The orange LED (
4
) flashes on arrival of the
indicator’s pulses.
4
After expiration of the set run-up bridging time…
… the green LED (
5
) extinguishes.
