12
JMNC Operating Instructions
3 Design and Function
3.2.4
Overspeed Monitoring (without Run-up
Bridging)
When overspeeding the set rotational speed the output
relay is attracted and the green LED (
5
) lights
Rotational speed
monitoring
device
the following relay contacts are
closed
JMNC
8 and 10
J
Operating speed
Switched speed
rotational speed
of the drive
II
III
pulses/min.
Standard operation
Malfunction
I
green LED (
5
) on: output relay (
16
) attracted
green LED (
5
) off: output relay (
16
) dropped
Item Description
Contact closed
green
LED
JMNC
I
relay triggering time
t = 200 ms
9 -10
II
number of pulses
below nominal value
9 -10
III
number of pulses
above nominal value
8 -10
Fig. 3-3: Time table for overspeed counter
