Mitsubishi Electric MES3-255C-EN, User Manual

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
Please contact our sales staff when you consider applying the product to special purpose, including use in devices
and systems for nuclear plant, aerospace engineering, medical care or automobile. (See the end of this document
for details.)

Current might exceeded the specified value when the power is cycled immediately after the power is breaking off
(in 5 seconds). Please turn on the power more than 5 seconds after breaking off.
Caution

Do not disassemble or modify the product. It may cause failure, electric shock or fire.

Precautions for maintenance and inspection

Use a soft dry cloth to clean off dirt of the product surface.

Do not let a chemical cloth remain on the surface for an extended period of time nor wipe the surface with thinner
or benzene.

Check for the following items to use the product properly for a long time.
Check for the items (1) to (3) once or twice every six months.
Check for the item (4) once a year.
(1) No damage on the product (2) No abnormality with LED indicators (3) No abnormal noise, smell or heat
(4) No looseness with installation, wire connection to terminal blocks, and connector connection (Check these
items under the electric outage condition.)
Caution

Checking looseness with installation, wire connection to terminal blocks, and connector
connection must be done under the electric outage condition.

Precautions for storage

To store the product, turn off the power and remove wires, and put it in a plastic bag.

To keep the power off for a long time, remove the battery connector.
(The b
attery’s accumulated backup time for electric blackout is 13,700 hours (1.57 years). Failure to use a battery
over backup time may cause a data clear of the product.

For long-time storage, avoid the following places. Failure to follow this instruction may cause failure and reduced
life of the product.

Ambient temperature exceeds -25ºC to +75ºC.

Daily average ambient temperature exceeds 35ºC.

Relative humidity exceeds 5% to 95% or condensation is
observed.

Dust, corrosive gas, saline and oil smoke exist.

Frequent vibration or impact exists.

Rainfall or water droplet hits the product.

Exposed to direct sunlight.

Metal pieces or conductive materials blow.

Under strong electromagnetic field or noise.

Precautions for disposal

The product shall be properly disposed of in compliance with the
“Wastes Disposal and Public Cleansing Act”.

The product has a built-in lithium battery. The lithium battery shall be disposed of in compliance with your local
regulations.

In EU member states, there is a separate collection system for waste batteries. Dispose of batteries properly at
the local community waste collection/recycling center.
The symbol shown below is printed on the batteries and packaging of batteries and devices with built-in batteries
used for Mitsubishi programmable controllers.
Note: This symbol is for EU member states only.
The symbol is specified in the new EU Battery Directive (2006/66/EC) Article 20 "Information for
end-users" and Annex II.
The symbol indicates that batteries need to be disposed of separately from other wastes.
Caution

There may be some electricity left in the lithium battery removed. Keep it away from other
metal parts because its contact with the metal parts may cause heat, rupture, or fire.