2.3 Input Signal Wiring

General Precautions to Be Taken While Wiring

WARNING

To prevent the possibility of electric shock when wiring, make sure that the power supply source is turned OFF.

CAUTION

If a strong tension is applied to the cable wired to the recorder, the terminals of the recorder and/or the cable can be damaged. In order to prevent tension from being applied directly on the terminals, fasten all wiring cables to the rear of the mounting panel.

Do not apply a voltage exceeding the following value to the input terminals as this may damage the recorder.

Maximum input voltage

Voltage range less than or equal to 200 mVDC, TC, RTD, and DI: ±10 VDC

Ranges other than those listed above: ±60 VDC

Maximum common-mode voltage

±60 VDC (under measurement category II conditions)

The recorder is an INSTALLATION CATEGORY II product.

Precautions to Be Taken While Wiring

Take the following precautions when wring the input signal cables.

It is recommended that crimp-on lug with insulation sleeves (designed for 4-mm screws) be used when connecting the input/output signal wires to the terminals. However, this does not apply clamped terminals (/H2).

Crimp-on lug with insulation sleeves (for 4 mm screws)

For clamped terminals (/H2), the following wire is recommended.

Conductive cross-sectional area for single wire: 0.14 mm2 to 1.5 mm2, stranded wire: 0.14 mm2 to 1.0 mm2

Length of the stripped section of the wire: Approx. 5 mm

Take measures to prevent noise from entering the measurement circuit.

Move the measurement circuit away from the power cable (power circuit) and ground circuit.

It is desirable that the object being measured does not generate noise. However, if this is unavoidable, isolate the measurement circuit from the object. Also, ground the object being measured.

Shielded wires should be used to minimize noise caused by electrostatic induction. Connect the shield to the ground terminal of the recorder as necessary (make sure you are not grounding at two points).

To minimize noise caused by electromagnetic induction, twist the measurement circuit wires at short, equal intervals.

Make sure to earth ground the protective ground terminal through minimum resistance (less than 100 ).

2

Before Using the Recorder

2-5

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Omega RD100B manual Input Signal Wiring, General Precautions to Be Taken While Wiring