ABB IRB 2000 - Interference Suppression

3.1.3
Interference suppression
Relay coils and other units in the control system which could cause interference are
suppressed so that their operation does not interfere with the control system.
Relay coils, conductors and motors connected to the system should be suppressed in a
corresponding way. The figure below shows how this can be done.
Note that the operating time of a DC- relay increases when the relay is suppressed,
particularly when a diode is connected in parallel with the coil. A varistor give a
shorter realeasing time. Diodes and RC-filters can be replaced with varistors.
A varistor gives a shorter delay.The suppression of coils also extends the service life of
the switches which control the coils.
Examples of how to suppress peripheral equipment connected to the robot system
+24VDC
ov
{]—
24 V DC, or ACvoltage
The diode is to be dimensioned for
the same current as the relay coil,
and a voltage of two times the
supply voltage
R 100 ohm, 1W
C 0.1-1 nF
> 500 V max voltage
125 V nominal voltage
3X380V «
3X380V ,
R 100 ohm, 2 W
C 0.5 nF
> 1000 V max voltage
> 420 V nominal voltage
R 100 ohm, 1W
C 0.5 uF
< 1000 V max voltage
> 250 V nominal voltage
INSTALLATION
3:2
S3