X20 system modules • Digital output modules • Calculation of the additional power dissipation resulting from
actuators
1064
X20 system User's Manual 3.10
4.15.2 Calculation of the additional power dissipation resulting from actuators
Calculation of power dissipation when specifying R
DS(on)
Explaining output load with an X20DO4332 example
GND
+24 VDC
GND
+24 VDC
DO
Ac
tu
at
or
1
Ac
tu
at
or
2
Ac
tu
at
or
4
Ac
tu
at
or
3
1 A
0.6 A
1.2 A
1 A
Figure 314: Calculation of power dissipation when specifying R
DS(on)
Theoretically highest power dissipation resulting from actuators:
Number of outputs * RDS
on
* nominal output current
2
= power dissipation
4 * 140 mΩ * 2 A
2
= 2.24 W
Power dissipation resulting from actuators in this example:
140 mΩ * (1 A
2
+ 0.6 A
2
+ 1.2 A
2
+ 1 A
2
) = 0.532 W
Power dissipation calculation when specifying the residual voltage
Explaining output load with an X20DO4623 example
GND
+24 VDC
GND
+24 VDC
DO
L
N
L
N
Act
ua
to
r 1
Act
ua
to
r 2
0.5 A
0.2 A
0.3 A
0.4 A
Act
ua
to
r 3
Act
ua
to
r 4
Figure 315: Power dissipation calculation when specifying the residual voltage
Theoretically highest power dissipation resulting from actuators:
Number of outputs * residual voltage * nominal output current = power dissipation
4 * 1.6 V * 0.5 A = 3.2 W
Power dissipation resulting from actuators in this example:
1.6 V * (0.5 A + 0.2 A + 0.3 A + 0.4 A) = 2.24 W
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