Saia-Burgess Controls AG
Manual Manual PCD 1 / PCD 2 Series │ Document 26 / 737 EN22 │ 2013-11-26
Appendix
A-9
Installation direction and relays contact protection
A
The resistors used must withstand high voltages (pulse stability). With low resistance
values in particular, voltage ashovers can occur at the ground helical section pro-
duced in the manufacturing process. For this reason, composite carbon resistors are
often used in screening units. However, enamelled wire resistors or cement resistors
with a large helical pitch are suitable.
Dimensioning guide:
The value for C is the direct result of the switching current. The resistance value R can
be established by drawing a straight line through the corresponding points on the I and U
curves and reading off the resistance at the intersection with the R curve.
Load
Example:
U = 100 V I = 1 A
C is direct result with 0,1 μF
R = 10 Ω (point of intersection with R scale)
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