Hitachi NJI-350B manual Wiring to the power module, Unit Screw Clamping, 10-4

Chapter 10 PLC Installation, Mounting, Wiring

(3)Wiring to the power module

Power supply for the sensor

100 V AC to

240 V AC

Power leakage breaker

Noise

(a)	For power supply wiring, use a cable of 2
	mm2 or more to prevent a voltage drop from
	occurring.
(b) For the function ground terminal (PE
	terminal), use a cable of 2 mm2 or more and
	provide Class D grounding (100 Ω or less).
	The appropriate length for the ground cable
	is within 20 m.
	1] Instrumentation panel and relay panel
	grounding may be shared.
	2] Avoid grounding shared with equipment
	that may generate noise such as high-
	frequency heating furnace, large-scaled
	power panel (several kW or more),

Shielded insulated transformer

filter

thyristor exchanger, electric welders, etc.

3] Connect a noise filter (NF) to the power

cable.

(c) Tighten the terminal screws within the torque

Figure 10.4 Power supply wiring diagram

(4)Wiring cable for I/O signals

6

6

range as shown below.

Unit	Screw	Clamping
		torque
10-point	M2.5	0.3 to 0.4 Nxm
14, 23, 28-point,	M3.0	0.5 to 0.6 Nxm
expansion

(d)Use the same power supply system for the basic and expansion units.

Tighten each terminal screw using a torque of the specified torque range.

When using a crimp terminal, use one with an outer diameter of 6 mm or less.

Use only up to two crimp terminals in the same terminal. Avoid clamping down more than three at the same time.

Only one piece of cable can be wired per terminal if the cable type is between AWG14 and AWG22 (cable thickness ranging between 2.1 mm2 and 0.36 mm2), but two pieces can be wired if the cable type is between AWG16 and AWG22 (between 1.3 mm2 and 0.36 mm2).

10-4