Omron CPM1A Operation Manual page 21

EC Directives
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6-4 Relay Output Noise Reduction Methods
Countermeasures
Countermeasure Examples
6-5 CPM1A-MAD01 Conformance to EMC Directives
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All Expansion I/O Units except for the CPM1A-20EDR conform to EC Directives.
To ensure that the machine or device in which the CPM1A PC is used complies
with EC Directives, the PC must be installed as follows:
1. The CPM1A PC must be installed within a control panel.
2. Reinforced insulation or double insulation must be used for the DC power
supplies used for the PC and I/O power supplies.
3. CPM1A PCs complying with EC Directives also conform to the Common
Emission Standard (EN61000-6-4). Radiated emission characteristics
(10-m regulations) may vary depending on the configuration of the control
panel used, other devices connected to the control panel, wiring, and other
conditions. You must therefore confirm that the overall machine or equip-
ment complies with EC Directives.
All CPM1A CPU Units with model numbers ending in "-V1" conform to the Com-
mon Emission Standards (EN61000-6-4) of the EMC Directives.
For CPM1A CPU Units with model numbers not ending in "-V1," Relay Output
Units and Transistor Output Units of CPU Units with DC power supplies conform
to the Common Emission Standards (EN61000-6-4) of the EMC Directives.
Relay Output Units, however, conform to the Common Emission Standards
(EN61000-6-4) only when the output load power supply is outside the ranges
specified for the Low Voltage Directive (less than 75 VDC or less than 50 VAC).
When a Unit is built into another device, however, it may not satisfy these stan-
dards due to noise generated by relay output switching. In such a case, a noise
filter must be connected to the load side or other appropriate countermeasures
must be provided external to the PC.
Countermeasures taken to satisfy the standards vary depending on the devices
on the load side, wiring, configuration of machines, etc. Following are examples
of countermeasures for reducing the generated noise.
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 more than 5 times per minute.
When switching an inductive load, connect a surge protector, diodes, etc., in par-
allel with the load or contact. For detailed circuit examples, refer to the relevant
parts of this manual.
Immunity testing conditions when using the current I/O of the CPM1A-MAD01
are as follows.
• Total accuracy: +10%/-1%
• Insert the following core in each line as shown below.
Recommended core: 2643-002402
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