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Wiring – Yokogawa Touch Screen GP20 User Manual

Page 21

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19

IM 04L51B01-02EN

Installation and Wiring

Wiring

• To prevent electric shock while wiring,

make sure that the power supply is

turned off.

• If a voltage of more than 30 VAC or

60 VDC is to be applied to the output

terminals, use ring-tongue crimp-on

lugs with insulation sleeves on all

terminals to prevent the signal cables

from slipping out when the screws be-

come loose. Furthermore, use double-

insulated cables (dielectric strength

of 2300 VAC or more) for the signal

cables on which a voltage of 30 VAC

or 60 VDC or more is to be applied.

For all other signal cables, use basic

insulated cables (dielectric strength of

1390 VAC). To prevent electric shock,

attach the terminal cover after wiring

and make sure not to touch the termi-

nals.

• Applying a strong tension to the input

and output signal cables connected to

the GX/GP may damage the cables or

the GX/GP terminals. To avoid apply-

ing tension directly to the terminals,

fix all cables to the rear of the mount-

ing panel.

• To prevent fire, use signal cables with

a temperature rating of 70°C or more.

• Do not apply voltages that exceed the

following values to the input termi-

nals. Doing so may damage the GX/

GP.

GX90XA

• Maximum input voltage: ±60 VDC

• Maximum common mode voltage: ±60

VDC (under measurement category II

conditions)

GX90XD

• Maximum input voltage: +10 VDC

• Maximum common mode voltage: ±50

VDC

The GX/GP is an installation category II

product.

Precautions to Be Taken While Wiring

Take the following precautions when wiring the input signal

cables.

• With a screw terminal, we recommend that you use a

crimp-on lug with an insulation sleeve (M4 for power

supply wiring, M3 for signal wiring).

Crimp-on lug with an insulation sleeve

Recommended signal

wiring crimp-on lug

N1.25-MS3

(JST Mfg. Co., Ltd.)

• With a clamp terminal, we recommend the following

wire.

GX90XA

Cross-sectional area

0.05 mm

2

to 1.5 mm

2

(AWG30 to 16)

Stripped wire length

5 to 6 mm

GX90XD

Cross-sectional area

0.2 mm

2

to 1.5 mm

2

(AWG24 to 16)

Stripped wire length

9 to 10 mm

RS-422/485 (/C3 option)

Cross-sectional area

0.08 mm

2

to 1.5 mm

2

(AWG28 to 16)

Stripped wire length

6 to 7 mm

FAIL output/status output (/FL option)

Cross-sectional area

0.33 mm

2

to 2.0 mm

2

(AWG22 to 14)

Stripped wire length

10 to 11 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.

• Ideally, the object being measured should 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 the noise

caused by electrostatic induction. Connect the shield

to the ground terminal of the GX/GP 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 Ω).

• When using internal reference junction compensation

on the thermocouple input, take measures to stabilize

the temperature at the input terminal.

• Always use the terminal cover.

• Do not use thick wires which may cause large heat

dissipation (we recommend a cross sectional area of

0.5 mm

2

or less).

• Make sure that the ambient temperature remains

reasonably stable. Large temperature fluctuations

can occur if a nearby fan turns on or off.

• Connecting the input wires in parallel with other

devices can cause signal degradation, affecting all

connected devices. If you need to make a parallel

connection, then

• Turn the burnout detection function off.

• Ground the instruments to the same point.

• Do not turn ON or OFF another instrument during

operation. This can have adverse effects on the

other instruments.

• RTDs cannot be wired in parallel.

Wiring Procedure

A terminal cover is screwed in place on the I/O terminal

block. A label indicating the terminal arrangement is

affixed to the cover.

1. Turn off the GX/GP, and remove the terminal cover.

2. Connect the signal cables to the terminals.

Recommended

torque for

tightening the

screws

Screw terminal

(M3)

0.5 to 0.6 N•m

Clamp terminal

GX90XA: 0.4 N•m

GX90XD: 0.5 N•m

3. Attach the terminal cover and fasten it with screws. The

appropriate tightening torque for the screws is 0.6 N•m.

Note

With a clamp terminal, if you use a single wire whose

diameter is 0.3 mm or less, you may not be able to clamp

the wire securely to the terminal. Take measures to

securely clamp the wire such as by folding the conductor

section that will be connected to the clamp terminal in half.

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