Caution For Compliance With Ec Directive - Mitsubishi FX3U SERIES User Manual

Caution for compliance with EC Directive

1. Installation in Enclosure
Programmable logic controllers are open-type devices that must be installed and used within conductive
control boxes. Please use the FX
shielded control boxes. Please secure the control box lid to the control box (for conduction). Installation within
a control box greatly affects the safety of the system and aids in shielding noise from the programmable logic
controller.
2. Caution for Analog Products in use
The analog special adapters have been found to be compliant to the European standards in the aforesaid
manual and directive. However, for the very best performance from what are in fact delicate measuring and
controlled output devices, Mitsubishi Electric would like to make the following points;
As analog devices are sensitive by nature, their use should be considered carefully. For users of proprietary
cables (integral with sensors or actuators), these users should follow those manufacturers' installation
requirements.
Mitsubishi Electric recommends that shielded cables be used. If NO other EMC protection is provided, users
may experience temporary induced errors not exceeding +10%/-10% in very heavy industrial areas.
However, Mitsubishi Electric suggests that if adequate EMC precautions are followed with general good EMC
practice for the users complete control system, users can expect errors as specified in this manual.
- Sensitive analog cables should not be laid in the same trunking or cable conduit as high voltage cabling.
Where possible, users should run analog cables separately.
- Good cable shielding should be used. When terminating the shield at Earth - ensure that no earth loops
are accidentally created.
- When reading analog values, EMC induced errors can be smoothed out by averaging the readings. This
can be achieved either through functions on the analog special adapters/blocks or through a user's
program in the FX
Series programmable logic controllers while installed in conductive
3U
Series PLC main unit.
3U
19