Instruction Manual

A. Technical appendix
A−8
Festo P.BE−CPX−SYS−EN en 0902e
Ascertain by formula
Proceed as follows:
1. Calculate the maximum current consumption of the inputs
and electronics (I
1
) as well as of the outputs and val
ves(I
2
).
2. Ascertain the lowest voltage to be expected during opera
tion (V
Bmin
) on the power unit. Take the following into
account:
· The load dependency of the power supply unit
· The fluctuations in the primary voltage
· The operating temperature of the equipment
3. Enter the values in the relevant formula. The equivalent
circuit diagram as well as the example explain the correla
tions.