X20 system modules • Digital output modules • Calculation of the additional power dissipation resulting from
actuators
X20 system User's Manual 3.10
1065
Power dissipation calculation when specifying the contact resistance
Explaining output load with an X20DO4649 example
GND
+24 VDC
GND
+24 VDC
DO
230 VAC
3 A
3 A
Figure 316: Power dissipation calculation when specifying the contact resistance
Theoretically highest power dissipation resulting from actuators:
Number of outputs * contact resistance * nominal output current
2
= power dissipation
4 * 15 mΩ * 5 A
2
= 1.5 W
Power dissipation resulting from actuators in this example:
15 mΩ * (3 A
2
+ 3 A
2
) = 0.27 W
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