Festo Контроллер позиционирования CPX-CMPX - Manual (Page 151)

A. Technical appendix
A−7
Festo P.BE−CPX−SYS−EN en 0902e
A.2 Cable length and cross−sectional area
Note
In the following section it is assumed that the reader is
familiar with the information in the chapter Installation" in
this manual. This section is directed exclusively at personĆ
nel trained in electrotechnology.
A load−dependent drop in voltage occurs on the cables of the
operating voltage supply to a CPX terminal. This can cause
the voltage at pin 1 or pin 2 of the operating voltage connecĆ
tion to be outside the permitted tolerance.
Recommendation:
· Avoid long distances between the power supply unit and
the CPX terminal.
· Ascertain the most suitable cross−sectional area and the
maximum cable length for the operating voltage cable in
accordance with the following formula.
Note
The following formula assumes that the cross−sectional
areas of the operating voltage supply are the same.