Chapter 3 Installation; Notes For Installation; Requirements For Installation Position; Installation Method - Emerson EC20 Series User Manual

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Table Of Contents

Table of Contents

3.1 Notes For Installation

The PLC is designed to be used in the environments meeting with standard II installation ambient, and Class 2

pollution. So the unit should be installed in such environment free of dust, conductive dust, corrosive or flammable

gas, excessive heat, moisture or rain; Besides, shocks and vibrations will also affect the reliability of the PLC and

shorten its service life, and should therefore be avoided.

Usually, the user should mount the PLC and the associated switches, contactors to the inside wall of the electric

cabinet and keep adequate natural convection. If the ambient temperature is a little high, or a heat generating

equipment is nearby, then a forced convection device should be installed on the top or the side of the cabinet to

prevent the overheat of the unit.

Take special care not to allow metal debris and wire lead to fall inside the vent of the PLC during the screw hole

processing and wiring. Otherwise there is a danger of fire, damage or faulty operation of equipment.

Once the installation of the new PLC is complete, remove everything on the surface of the vent, including packing

goods such as protective paper. Otherwise the poor ventilation during the operation may result in fire, damage or

faulty operation of equipment.

Do not wire, inset or pull out the cable plug with power applied. Otherwise there is a danger of electric shock or circuit

damage.

Installation and wiring must be firm and reliable; bad contact may result in faulty operation of equipment.

3.2 Requirements For Installation Position

To prevent a rise in temperature, mount the PLC up and down to the backboard of the cabinet horizontally. Never

mount them to the floor or ceiling of an enclosure or other directions, as shown in the Figure 3-1. You must provide a

clearance of at least 15 mm, both above and below the units, for proper cooling. No heat generating equipment

should

exist around the PLC.

3.3 Installation Method

Generally you can mount the PLC onto a standard rail (DIN) with 35mm width. Follow these steps:

1. Fix the DIN rail to the backboard;

2. Pull out the clip (located on the bottom of the PLC) and hook the back of the PLC onto the rail.

3. Snap the clip closed, carefully checking to ensure that the clip has fastened the PLC securely onto the rail.

4. At last, install two DIN rail stops at the two sides of the PLC to avoid slippage around.

Other EC20 series modules can be mounted using the same procedures.