Conditions For Meeting Emc Directives When Using Cp-Series Relay Expansion I/O Units - Omron CP1L-EL20DR-D Operation Manual

Conformance to EC Directives
Circuit
Varistor method
Power
supply
6-5 Conditions for Meeting EMC Directives when Using CP-series
Relay Expansion I/O Units
Recommended Ferrite Core
Recommended Connection Method
1,2,3...
xxxii
Current
AC DC
Yes Yes The varistor method prevents the impo-
sition of high voltage between the con-
tacts by using the constant voltage
characteristic of the varistor. There is
time lag between the moment the cir-
cuit is opened and the moment the load
is reset.
If the supply voltage is 24 or 48 V, insert
the varistor in parallel with the load. If
the supply voltage is 100 to 200 V,
insert the varistor between the con-
tacts.
When switching a load with a high inrush current such as an incandescent
lamp, suppress the inrush current as shown below.
Countermeasure 1
OUT
R
COM
Providing a dark current of
approx. one-third of the rated
value through an incandescent
lamp
EN61131-2 immunity testing conditions when using the CP1W-40EDR,
CP1W-32ER, or CP1W-16ER with a CP1W-CN811 I/O Connecting Cable are
given below.
Ferrite Core (Data Line Filter): 0443-164151 manufactured by Nisshin Electric
Minimum impedance: 90 Ω at 25 MHz, 160 Ω at 100 MHz
30
32
1. Cable Connection Method
Characteristic
Countermeasure 2
OUT
COM
Providing a limiting resistor
33
Required element
---
R
6