YOKOGAWA VZ20X, User Manual

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IM 77V01B01-01EN 5th Edition: 2023.03.07-00
CAUTION
・
Wire in an environment having an ambient temperature of -5°C or more.
・ When connecting both the power terminal and USB cable to VZ20X, first supply
power from the power terminal and then connect the USB cable.
・ Power is supplied from both the power terminal and USB cable. For this reason,
before turning the VZ20X off, be sure to disconnect the USB cable.
・ For wiring onto a push-in terminal, use a cable pre-attached with a ferrule terminal.
・
Do not use a ferrule terminal that is bent, crushed or otherwise deformed excluding
indentations caused by a crimping tool. Do not use ferrule terminals once they have
been deformed by connection. Replace with a newly crimped ferrule terminal. Use of
deformed ferrule terminals may result in the terminal getting caught on the terminal
block or prevent the terminal from being disconnected.
・ When wiring the input signal wires, observe the minimum bending radius value of the
electric wire. For the minimum bending radius value, use either an electric wire that
satisfies the specification designated by the electric wire manufacturer and an electric
wire having six times or more the diameter of the electric wire conductor.
・ Prevent static electricity from being applied to terminals.
・
Before wiring to terminals, discharge static electricity from your body and tools to
prevent it from being applied to terminals.
・
The product might become damaged if static electricity is applied to signal wires or
transient noise is applied at a similar high voltage.
・
Take measures to prevent noise from entering the measurement circuit.
・ Locate the measurement circuit away from the power supply line (power circuit).
・
Preferably, the measurement target should not be a noise source. However, if this
is unavoidable, insulate the measurement target and measurement circuit. Also,
ground the measurement target.
・ Shielded wires are effective against noise caused by static induction. Ground
shielded leads, as necessary.
・ Wiring the measurement circuit with its wiring twisted at short equal intervals is
relatively effective against noise caused by electromagnetic induction.
・ When using the reference junction compensation of this product for a thermocouple
input, ensure that the temperature of the terminal section is made stable.
・ When wiring, use leads of the specified compatible electric wire size.
・
Prevent changes in the ambient air temperature from occurring. Switching fans
nearby on and off, in particular, causes large changes in temperature.
・
Connecting input wiring in parallel to other devices may adversely affect measured
values. If such a connection is unavoidable,
・
Set burnout detection to OFF.
・ Do not switch one of the devices on and off during operation. Doing so may
adversely affect the other device.
・ Resistance temperature detectors or resistor inputs cannot be connected in parallel.
・
Do not connect to unused terminals.
・ Make sure that the wiring does not block status LEDs.