ABB IRB 6600 - 175/2.55 User Manual page 286

5 Electrical connections
5.2.3 Interference elimination
5.2.3 Interference elimination
External units
External relay coils, solenoids, and other units that will be connected to the controller must
be neutralized. The figure below illustrates how this can be done.
The turn-off time for DC relays increases after neutralisation, especially if a diode is connected
across the coil. Varistors give shorter turn-off times. Neutralising the coils lengthens the life of
the switches that control them
Clamping with a The diode should be be dimensioned for the same current as the relay coil, and a voltage of
diode
twice the supply voltage.
+24V
xx0100000163
Clamping with a
The varistor should be be dimensioned for the same current as the relay coil, and a voltage of
varistor
twice the supply voltage.
+24V
xx0100000164
Clamping with an R 100 ohm, 1W C 0.1 - 1 mF. >500V max. voltage, 125V nominal voltage.
RC circuit
+24V DC,
or AC voltage
xx0100000165
84
0V
0V
R C 0V
A 3HAC 16245-1