Hitachi NJI-350B manual Installation location and environment, Installing the unit, 10-1

Chapter 10 PLC Installation, Mounting, Wiring

Chapter 10 PLC Installation, Mounting, Wiring

10.1 Installation

(1)Installation location and environment

(a)When installing the MICRO-EH, use the unit under the environment within the general specification.

(b)Mount the PLC onto a metal plate.

(c)Install the PLC in a suitable enclosure such as a cabinet that opens with a key, tool, etc.

(2)Installing the unit

(a)Precautions when installing the unit

1] When installing the base unit, fix it securely with screws in 2 places (M4, length 20 mm or more) or DIN rail.

2] To use the unit within the ambient temperature range,

a)Allow ample space for air circulation. (50 mm or more at top and bottom, 10 mm or more to the left and right)

b)Avoid installing the unit directly above equipment that generates significant heat (heater, transformer, large-capacity resistance, etc.)

c)When the ambient temperature reaches more than 55 °C, install a fan or cooler to lower the

temperature to below 55 °C.

3] Avoid mounting inside a panel where high-voltage equipment is installed.

4] Install 200 mm or more away from high-voltage lines or power lines.

5] Avoid upside down, vertical or horizontal mounting.

	50 mm or more
10 mm or more		10 mm or more
	P L C
	50 mm or more
	50 mm or more
10 mm or more		10 mm or more

L1

L2

Figure 10.2 External dimensions

P L C		Dimensional table
50 mm or more		Unit	L1	L2
		10-point	65	70
		14-point (basic, exp.)	85	80
Wiring	duct
		23, 28-point (basic, exp.)	140	80

Figure 10.1 Mounting clearances

Unit: mm

(b)Mounting to a DIN rail

Attaching to a DIN rail

1]

1] Hook the claw (top side) attached to the back of the unit to the DIN rail.

2] Press the unit into the DIN rail until it clicks.

Note: After installation, check to make sure the base unit is securely fixed.

2]

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