Transient And Rfi Interference - Ametek Dycor CG1100 Series User Manual

Transient and RFI Interference


NOTE
•
Although there are transient and noise protectors on all control unit
I/O connections, this protection is intended to act as a last line of
defense against unwanted transient and RFI interference. You must
follow proper installation practices to prevent the introduction of
transients and noise into the system. Install transient suppressors on
inductive loads connected to the control unit at the inductive loads. Be
sure to place the transient suppressor as close to the load as possible.
Examples of transient suppressors include MOVs, TRANSORBs, and
RC snubbers.
•
AC mains supply wiring should not be run in the same conduit with
mains supply wiring that feeds heavy inductive loads.
•
Avoid running signal wiring in the same cable or conduit with wires
that power inductive loads unless all the cables within the conduit are
shielded, the inductive loads are small, and the transient suppressors
are used at the loads.
•
Do not run signal lines in the same cable or conduit with high voltage
lines.
•
For optimum noise protection, control unit mains supply wiring
should be connected to a circuit separate from any circuit that could
introduce transients into the system. As an example, do not run mo-
tors, blowers, or air conditioners using the same mains supply circuit
or conduit as the control unit's mains supply circuit or conduit.
Follow general grounding and shielding requirements for all wiring
as described in the wiring section of Chapter 2.
Do not run control unit AC mains supply wiring in the same conduit
with other AC mains supply wiring. By keeping this wiring separate,
you prevent transient signals from reaching the control unit.
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