8
JMNC Operating Instructions
3 Design and Function
3
Design and Function
The electronic rotational speed monitoring device JMNC
is applied together with a pulse indicator for monitoring
and controlling drives. The pulses of the indicator are
analysed by the speed monitoring device which signals
the overspeeding or underspeeding of a nominal rota-
tional speed.
3.1
Design
The electronic rotational speed monitoring device JMNC
is equipped into a solid plastic housing (
8
), which can be
mounted onto an operating panel by means of screws.
All indicating and operating elements are assigned to
the front side of the device
Potentiometer start-up delay (1), "run-up bridging"
This potentiometer serves to set the duration of the run-
up bridging in between 0 and approx. 45 seconds.
Pulse selection switch (2)
Fig. 3-1: Operating elements of the monitoring device
Start-up delay (
1
)
(run-up bridging)
Pulse selection switch (
2
)
Fine (
3
)
(Fine setting of the nominal value)
Coarse (
6
)
(Nominal value setting)
Set button (
7
)
LED orange (
4
)
(Input supervision)
LED green (
5
)
(Switching status indication)
