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4. Connecting Signal Input Cables
This section describes how to connect the signal input cables.
WARNING
To avoid electric shocks, check that the AC source for the power supply has been turned off before connecting
CAUTION
A large pulling force applied to an input/output signal cable connected to the MT100 may damage a
terminal or the signal cable. Therefore, fix the wiring cords to the back of the installed panel.
To prevent fire, use signal cables with a rated temperature of 70°C or higher.
Do not apply a voltage higher than the following values to input terminals. If you do, the MT100 may
suffer damages.
Maximum input voltage: ±60VDC
Maximum common-mode voltage: AC33Vrms or ±60VDC
Caution on Connecting Cables
Connect input signal cables to terminals using insulated solderless terminals (for 4mm screws).
Keep the measuring circuit away from a power cable (power circuit) or a ground circuit.
If the measuring target is a noise source, refer to page 29 and take a necessary measure.
Be sure to connect a protective ground terminal to the ground at a low grounding resistance (50
Be sure to attach a terminal cover when you measure temperatures using a thermocouple.
Do not use a thick wire with a high heat radiation effect when you measure a temperature using a
thermocouple (a wire having a diameter of 0.65mm or less is recommended).
Avoid causing changes in the outside air temperature. In particular, turning on and off the fan near the
MT100 causes significant temperature changes.
If an input cable is connected in parallel with another device, the measurement values of both the
MT100 and the device may be influenced.
Do not turn on and off one of the devices during operation. The other device may be adversely
influenced.
Connecting Cables
Remove the terminal cover.
Connect signal cables to the input terminals.
The appropriate tightening torque of screws is 12 to 14kgf/cm.
Connect wires to terminals as shown in the following figure after checking them.
Reinstall the terminal cover.
Connection diagram
Direct voltage input
Direct voltage
Resistance temperature detector input
27
Thermocouple input
Compensation copper wire
Direct current input
Direct current
or less).
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