16
IM 04L55B01-02EN
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, GX90XP, GX90YA
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
● When wiring input/output signal cables, observe the
minimum bend radius of the cables. For the minimum
bend radius, use the specifications indicated by the cable
manufacture or six times the cable conductor diameter,
whichever is larger.
● 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 GM 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.
● 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 other instruments on or off during operation.
This can have adverse effects on the other instruments.
• RTD or resistance input cannot be wired in parallel.
Removing and Attaching a Terminal Cover
Removing the Terminal Cover
Loosen the screw at the bottom section of the terminal
cover, and remove the cover.
Attaching the Terminal Cover
A
The shape of the cover varies depending on
the module, but the procedure is the same.
1. Insert the two hooks at the top section
on the inside of the terminal cover into
A, and push the bottom section of the
terminal cover.
2. Fasten the screw at the bottom section
of the terminal cover to fix the cover in
place.
Recommended tightening torque:
0.6 N•m
Removing and Attaching a Terminal Block
Removing the GX90XA/GX90WD/GX90UT Terminal
Block
Push down on the lever at the bottom section of the
module, and pull the terminal block out.
Attaching the GX90XA/GX90WD/GX90UT Terminal
Block
Insert the terminal block into the module, and push the
lever firmly against the module (at the position indicated by
the arrow in the figure).
Terminal block release lever
Side view of module
For modules other than the GX90XA, you can use the
attachment screw to remove and attach them.
Terminal block attachment screw
Recommended torque for tightening the terminal block
attachment screws: 0.1 N•m
