Yokogawa Data Acquisition with PID Control CX2000 - Manual (Page 134)

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IM 04L31A01-01E
Installation and Wiring
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General Precautions When Wiring the Input/Output Signal Wires
ARNING WARNING
• To prevent the possibility of electric shock when wiring, confirm that the power
supply source is turned OFF.
• If a voltage greater than or equal to 30 VAC/60 VDC is going to be applied to the
output terminals, use round crimp-on lugs with insulation covers (to prevent the
wires from coming loose) for connecting the signal wires on all output terminals. In
addition, use double insulated wires (withstand voltage of 2300 VAC or more) for
signal wires to which a voltage greater than or equal to 30 VAC/60 VDC is to be
applied and basic insulation wires (withstand voltage of 1350 VAC or more) for all
other signal wires. To prevent the possibility of electric shock, attach the terminal
cover after connecting the wires and keep your hands away from the terminals.
CAUTION
• If a large pulling force is applied to the input/output signal wires connected to the
CX2000, the terminal or signal wire may become damaged. To prevent this
from happening, fix all the wiring cords to the rear of the installation panel.
• To prevent fire, use signal wires having a temperature rating of 70°C or more.
• Do not apply a voltage exceeding the following value to the input terminals.
Otherwise, damage to the unit may result.
• Maximum input voltage
Voltage range less than or equal to 2 VDC and thermocouples: ±10 VDC
Voltage range between 6 and 50 VDC: ±60 VDC
• Maximum common mode noise voltage
250 VACrms (50/60 Hz)
• The CX2000 is an installation category II product.
• Use the following circuit voltage for the connection to the alarm/FAIL/Memory
End output terminal.
• When the connection is to Mains Circuits (primary AC power source circuits):
150 V or less
• When the connection is to circuits derived from Mains Circuits (secondary
circuits): 250 V or less
(Mains Circuits voltage is less than 300 V, and connection must be used by
isolation transformer.)
It is recommended that crimp-on lugs with isolation sleeves (for 4-mm screws) be
used when connecting the input/output signal wires to the terminals.
For 4-mm screws
Ensure that noise does not enter the measurement circuit.
• Keep the measurement circuit away from the power supply cable (power supply
circuit) and ground circuit.
• It is desirable that the object under measurement is not a noise source. However, if
this is not avoidable, insulate the object under measurement and the measurement
circuit. In addition, ground the object under measurement.
• Shielded wires are effective against noise caused by electrostatic induction. As
necessary, connect the shield to the ground terminal of the CX2000 (make sure this
does not lead to grounding at two points).
• Twisting the measurement circuit wires at short intervals is relatively effective against
noise caused by electromagnetic induction.
• Make sure to ground the protective ground terminal through a small grounding
resistance (less than or equal to 100 Ω).
2.3 Wiring