33
JMNC Operating Instructions
6 Setting the Rotational Speed Monitoring Device JMNC
6.3.2
Setting the Switch Point for Overspeed
Danger of electric shocks!
The mounting and the electrical connection
may only be carried out by qualified electri-
cians.
Before starting the setting, disconnect the
plant and prevent it from being switched on
again.
Cover live parts in the vicinity to prevent any
contact.
Item
Description
Indication/Reaction
1
Switch on the supply voltage and the drive.
The output relay (
16
) is attracted.
The green LED (
5
) lights.
The orange LED (
4
) flashes in the cycle of
the incoming pulses.
2
Slowly turn the potentiometer Coarse (
6
) (nomi-
nal value setting) clockwise, until …
… the green LED (
5
) extinguishes.
The output relay (
16
) dropped.
3
Slowly turn the potentiometer Coarse (
6
) coun-
ter-clockwise, until …
… the green LED (
5
) lights again.
The switch point of the output relay (
16
) is
now adjusted to the operating rotational
speed.
4
Slowly turn the potentiometer Fine (
3
) clockwise,
until…
…the green LED (
5
) extinguishes.
The switch-off point is now 10% above the
operating rotational speed.
5
Switch off the voltage supply and the drive and
prevent them from being switched on again.
6
Make sure that the plant is free of any voltage.
Fine
±10%
