CABLE LENGTH AND CROSS SECTION
PLEASE NOTE
The following information is for the exclusive
use of personnel trained in electrotechnology
and who are already familiar with the contents
of the chapters on "Installation" in this manual.
A load-dependent drop in voltage occurs on all
three cables for the operating voltage supply to
a valve terminal. This can cause the voltage at
pin 1 or 2 of the operating voltage connection to
be outside the permitted tolerances.
Recommendation
• Avoid long distances between the power unit
and the terminal.
•
Calculate suitable cable lengths and
cross sections in accordance with the follow-
ing graphs or formulae. Please note that:
– the graphs supply proximity values for
the cross sections; 1.5 and 2.5 mm
2
.
– the formulae supply exact values for any
cross section.
PLEASE NOTE
The following graphs and formulae require that
the cross sections of the operating voltage
supply cables (pins 1, 2 and 3) are the same.
VIFB13 - 03/05 Appendix A
9701 NH A-7
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