Omron NB3Q-TW_B Startup Manual page 51

3 Installation and Wiring
Precautions for Safe Use
• Making the connection by using terminal screws crimping on a twisted-pair cable with a
crimping range of 12~26 AWG, and only 6.5 mm of insulation peel of the cable needs to be
peeled off. Tighten the terminal screws at a torque of between 0.3 and 0.5 N·m. Make sure
the screws are properly tightened.
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.
CP1E Wiring
This section provides a CP1E grounding example.
Please refer to the SYSMAC CP series CP1E CPU Unit User Manual for details on CP1E.
Power Connection and Grounding
Connect power and ground wires to terminal blocks.
Note Tighten the AC power cable to the terminal block at a torque of between 0.3 and 0.5 N·m. Loose screws may
occasionally result in fire or failure.
3-6
CP1E
NB7W
R S
MCCB
L1 L2/N COM 01 03 05
00 02 04 06
NB-series Programmable Terminals Startup Guide Manual(V109)
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