CV500-SLK21 datasheet(80/182 Pages) OMRON

80 / 182 page

4. The maximum switching capacity of the CV500-PS211 Power Supply Unit is

2 A at 24 VDC when complying with EC Directives (low-voltage directives).

5. CV-series PCs that meet EC Directives meet the common emission stan-

dard (EN50081-2) of the EMC Directives as individual products. When as-

sembled into machinery, however, the noise generated by switching relay

outputs can fail to meet the standard. When noise is excessive, surge killers

must be installed or other measures must be taken outside of the PC. The

measures required to meet the standard will vary with the load being driven,

wiring, the configuration of the machinery, etc.

The following examples show means of reducing noise. These means will

only reduce the amount of noise and will not eliminate noise. They are pro-

vided here as examples only.

Requirement

The following conditions can be used to determine if measures to reduce noise

are necessary. Refer to the EN50081-2 Standard for details.

• If the loads of the devices into which the PC is built are switched less than 5

times a minute, then no measures need to be taken.

• If the loads of the devices into which the PC is built are switched 5 times or

more a minute, then measures need to be taken.

Examples

Connect a surge suppressor or diode in parallel with the load, as shown in the

following diagrams, when switching inductive loads.

CR Method (AC or DC)

The reset time will be increased if the load is a relay, solenoid, or similar device.

Connect the CR between the load connections for 24-V and 48-V power supply

voltages and between the contact connections for 100 to 200-V power supply

voltages.

The capacitor and resistors can be based on the following guidelines.

0.5 to 1

µF for each amp of contact current

0.5 to 1

Ω for each volt of contact voltage.

You will need to adjust the above values depending on the characteristics of the

load, relay, etc., based on the discharge suppression of the capacitor when the

contacts are open and the current control effect of the resistor the next time the

circuit is closed.

The dielectric strength of the capacitor generally needs to be between 200 and

300 V. Use an AC capacitor (without polarity) in an AC circuit.

Inductive load

Power supply

Diode Method (DC Only)

The energy stored in the coil is impressed on the coil as a current by the action of

the parallel diode and converted to Joule heat by the resistance of the inductive

load. Here, the reset time will be increased even more than for the CR method.

Inductive Load Surge

Suppressor

Compliance with EC Directives

Section 3-6

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