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Precautions for Safe Use

• Do not press a flat-blade screwdriver straight into the release hole on a screwless clamping

terminal block. Doing so may break the terminal block.

• When you insert a flat-blade screwdriver into a release hole on a screwless clamping terminal

block, press it down with a force of 30N or less. Applying excessive force may damage the

terminal block.

• Do not incline or twist the flat-blade screwdriver while it is in a release hole on a screwless

clamping terminal block. Doing so may break the terminal block.

• Follow the instructions in this manual to correctly perform wiring.

• Do not pull on the cables or bend the cables beyond their natural limit.

Doing so may break the cables.

Securing Wires

It is necessary to secure wires to the screwless clamping terminal block depending on the wire

types that are used or the current flows on the wires.

The following table gives the necessity for securing wires.

Terminals

Wire type

Ferrule

Twisted wires Solid wire

Classification Current capacity Plated Unplated Plated Unplated

All terminals except ground

terminals

2 A max. No No No No No

Greater than 2 A and

4 A or less

Not possi-

ble

Yes Not possible

Ground terminals --- No No No No

Use the following procedure to secure the wires.

1 Prepare a cable tie.

A cable tie can be used with a width of 4 mm or less and a thickness of 1.5 mm or less.

Select a cable tie correctly for the operating environment.

5 Installation and Wiring

5-47

NX-series NX502 CPU Unit Hardware User's Manual (W629)

5-4 Wiring

5-4-8 Wiring to the CPU Unit Terminal Block

Omron NX Series Hardware User Manual

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