3G5A2-RPT01-PE datasheet(12/182 Pages) OMRON

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Conformance to EC Directives

4. PCs complying with EC Directives also conform to the Common Emission

Standard (EN50081-2). When a PC is built into a machine, however, noise

can be generated by switching devices using relay outputs and cause the

overall machine to fail to meet the Standards. If this occurs, surge killers

must be connected or other measures taken external to the PC.

The following methods represent typical methods for reducing noise, and

may not be sufficient in all cases. Required countermeasures will vary

depending on the devices connected to the control panel, wiring, the config-

uration of the system, and other conditions.

Countermeasures

Refer to EN50081-2 for more details.

Countermeasures are not required if the frequency of load switching for the

whole system including the PC is less than 5 times per minute.

Countermeasures are required if the frequency of load switching for the whole

system including the PC is 5 or more times per minute.

Countermeasure Examples

When switching an inductive load, connect a surge protector, diodes, etc., in par-

allel with the load or contact as shown below.

Circuit

Current

Characteristic

Required element

CR method

Power

supply

Yes

If the load is a relay or solenoid, there

is a time lag between the moment the

circuit is opened and the moment the

load is reset.

If the supply voltage is 24 or 48 V,

insert the surge protector in parallel

with the load. If the supply voltage is

100 to 200 V, insert the surge

protector between the contacts.

The capacitance of the capacitor must

be 1 to 0.5

µF per contact current of

1 A and resistance of the resistor must

be 0.5 to 1

Ω per contact voltage of

1 V. These values, however, vary with

the load and the characteristics of the

relay. Decide these values from

testing, and take into consideration

that the capacitance suppresses spark

discharge when the contacts are

separated and the resistance limits

the current that flows into the load

when the circuit is closed again.

The dielectric strength of the capacitor

must be 200 to 300 V. If the circuit is

an AC circuit, use a capacitor with no

polarity.

Diode method

Power

supply

Yes

The diode connected in parallel with

the load changes energy accumulated

by the coil into a current, which then

flows into the coil so that the current

will be converted into Joule heat by

the resistance of the inductive load.

This time lag, between the moment

the circuit is opened and the moment

the load is reset, caused by this

method is longer than that caused by

the CR method.

The reversed dielectric strength value

of the diode must be at least 10 times

as large as the circuit voltage value.

The forward current of the diode must

be the same as or larger than the load

current.

The reversed dielectric strength value

of the diode may be two to three times

larger than the supply voltage if the

surge protector is applied to electronic

circuits with low circuit voltages.

Varistor method

Power

supply

Yes

The varistor method prevents the

imposition of high voltage between the

contacts by using the constant voltage

characteristic of the varistor. There is

time lag between the moment the

circuit 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

contacts.

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