Omron NB3Q-TW00B Startup Manual Manual page 50

3 Installation and Wiring
Precautions for Safe Use
• Firstly, wire the twisted power line to the terminal block, then install the terminal block to the
NB Units.
Use power lines with AWG#12 to #26 thick, peel the coating 6.5 mm length, followed by
tightening the screw with 0.3 to 0.5N torque. Make sure the screw of the terminal block is
tightened firmly. Only NB3Q-TW
Do not make use of the terminal block of NB3Q-TW
Grounding
The NB unit has a functional earthing terminal (
Arrange the wiring according to the following conditions.
1
When a potential difference occurs between the NB Unit and the host, arrange the earthing as
illustrated. If the distance is too long to realize a single-point earthing, do not ground the
earthing terminal of the NB Unit.
2
When the NB Unit, and noise source equipments such as motors and inverters, etc. are
installed on the same panel, do not ground the earthing terminal of the NB unit.
Precautions for Safe Use
To prevent malfunctions caused by noise, ground the Unit correctly.
3-6
B has a different pin arrangement of the terminal block.
).
NB7W CP1E
NB-series Programmable Terminals Startup Guide Manual(V109)
B for other equipments.