Electronic overspeed switch EGS 2
EGS2_MANUAL-en_R3(2018-11-14)ID74563.docx
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Overspeed monitoring
The electronic overspeed switch EGS 2 has a galvanically insulated switching output. The switching
function is
realized with a semiconductor, the switching speed is set in our factory (switching
hysteresis 10%). Possible values for switching speed is any whole number between 1 and 5400 rpm.
If the set switching speed is exceeded, the switch opens.
It is recommended to save the switch circuit against an overcurrent with a fuse (0,5A).
Specification
Value
Switching speed range, factory-set
AK with solid shaft max. 6300 rpm
AK with hollow shaft max. 5400 rpm
Deviation from switch:
Accuracy of measurement: 2%
Switching time T
Sw
:<3ms
Switch data
0…30V DC/max 500mA
Max. voltage drop at closed switch: 0,7V
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Zero speed monitoring
The zero speed monitoring is a function for the control of rotary movements. This function is available
as an alternative to overspeed monitoring, not in addition. The galvanically isolated switching contact
changes the state as soon as the shaft leaves the zero speed.
Functionality:
At a speed of less than 0.25 rpm the zero speed monitoring is activated and the switching contacting
contact is closed. When the zero speed monitoring is activated, the current position value is stored
and monitored for possible changes in the angle of rotation. As a result, very slow or creeping wave
movements can also be detected. In the speed range from 0 to 0.25 rpm, the switching contact opens
for approx. 200 - 400 milliseconds after a change in the angular position of ± 5 °. The possible
switching contact states are shown in the following table.
The switching contact is closed at zero speed (n = 0 rpm).
For rotary movement (n
≥
0.25 rpm), the switching contact is open.
At a creep motion (0 <n <0.25 rpm), the switching contact opens as soon as a change in the angle of
rotation of more than ± 5 °. After 200 to 400 ms, the switching contact is closed again as long as the
speed is less than 0.25 rpm.
Rotation speed n
[rpm]
State
Switching contact
n = 0
(zero speed)
n
≥
0,25
(rotary motion)
0 < n < 0,25
(creep motion)
switching contact opens for
approx. 200 - 400 milliseconds
after a change in the angular
position of ± 5°