Project planning for 24 V supply power

The total current demand is calculated as follows from the total power consumption of all DC 24 V consumers in the axis system:

I	Current demand
Ptotal	Total power consumption
V	Actual value of the 24-V supply

For further information on calculating the total power consumption, refer to chapter Power consumption of the 24 V supply.

Depending on the determined total current demand of the DC 24 V voltage consumers, a one-sided supply or two-sided supply must be provided so that the conductor rails are not overloaded.

In addition, a distinction is made depending on whether an external DC 24 V switched-mode power supply or an MDS90A.. switched-mode power supply module is used.

One-sided supply of DC 24 V voltage supply

• Use of MDS90A.. switched-mode power supply modules for currents ≤ 45 A
• Use of external DC 24 V switched-mode power supplies for currents ≤ 40 A

For further information, refer to chapter One-sided supply with MDS90A.. switched-mode power supply modules and a total current consumption ≤ 45 A.

Two-sided supply of DC 24 V voltage supply

• Use of MDS90A.. switched-mode power supply modules for currents > 45 A
• Use of external DC 24 V switched-mode power supplies for currents > 40 A

For further information, refer to chapter Two-sided supply with an external DC 24 V switched-mode power supply and a total current consumption > 40 A.

For a two-sided supply, arrange the interruption point of the electronics supply in such a way that the current load of the 2 segments is divided symmetrically. If you use 2 separate external switched-mode power supplies, make sure that both switched-mode power supply outputs have the same reference potential.