Specifications
Safety Precautions
Transducers
107
Safety Precautions
Please pay attention to the following items when using transducers.
Read the instruction manual attached to the product before performing settings or using the device.
For safety reasons, mounting and connection work should only be performed by a professional electrical wiring technician.
Precautions concerning usage environment and
usage conditions
Do not use in the following locations. Use in such locations may
lead to malfunction, significant error or reduced service life.
Locations where the ambient temperature is outside the
range of -10°C~50°C.
Locations where the average daily temperature exceeds
35°C.
Locations where the humidity is outside the range of
30%RH~85% RH (no condensation).
Locations with excessive dust, corrosive gases, salinity or
oil fumes.
Locations with excessive vibration or impact.
Locations directly exposed to rain, water drops or sunlight.
Locations with excessive external noise.
Locations at an altitude of 1000m or more.
Locations where a strong electric field or magnetic field is
generated.
Locations where there are metal pieces or inductive
substances present.
1
Mounting precautions
Please pay attention to the following items regarding mounting.
The transducers must be mounted inside a panel.
Tighten the mounting screws using the following torques:
M4 iron screws ·········· 1.47~1.86N•m
M4 brass screws ········ 0.88~1.08N•m
M5 iron screws ·········· 2.94~3.43N•m
M5 brass screws ········ 1.67~2.06N•m
2
Connection precautions
Please pay attention to the following items regarding connection.
Use the specified materials and diameters for the
electrical wires that connect the output and load of
transducers in order to prevent failure due to external
noise or surges.
Use the following crimp terminals.
Although transmission distances for standard
combinations are indicated in this catalog, the values are
to be used when there is no interference (e.g., induction
voltage, surge) in the transmission line. If installation of
the transmission line parallel to power cables is
unavoidable and there is a possibility of inductive
interference, use a shielded transmission line to avoid
interference during use.
3
Series Applicable crimp terminals
T-51, T-101
T-120
Tightening torque
0.98~1.47N•m
0.61~0.82N•m
Round crimp terminals
(outer diameter: f8.5 or less) for M4 screws
Round crimp terminals
(outer diameter: f8.3 or less) for M4 screws
Round crimp terminals
(outer diameter: f7.1 or less) for M3.5 screws
Check the connection diagrams carefully before
making connections. Erroneous connections may
cause equipment to scorch or catch fire.
Connect correctly
Fasten electrical wires securely to the terminals.
Otherwise, overheating, equipment burnout or fire may
occur.
Fasten terminal connections securely
Do not perform connection work with live wires.
Electrical shock, electrical burns, equipment burnout or
fire may occur.
Do not perform work with live wires
Ensure that the signal on the secondary side of the CT
is connected correctly to the CT connection terminals.
Incorrect connection of the CT or opening the
secondary side of the CT will cause high voltage on the
secondary side of the CT, and may lead to equipment
failure, electrical shock or a fire.
Do not open the secondary side of a CT circuit
Ensure that the secondary side of the VT is correctly
connected to the VT connection terminals.
Incorrect connection of the VT or short-circuiting the
secondary side of the VT will cause a large overcurrent
to flow through the VT secondary winding, which will
lead to equipment failure, electrical shock or fire.
Do not short-circuit the secondary side of a VT circuit
CAUTION
Power factor and reactive power transducers will not
operate correctly when connected as a reverse phase
sequence. Use with the correct phase sequence.
When a device, such as a harmonics transducer for
measuring harmonic voltage is connected to a VT, do not
remove the auxiliary power supply of multi-use or
harmonics transducers from the VT. The harmonic
voltage may not be measured correctly.
In regard to grounding in the connection diagrams,
grounding of the secondary sides of the VT and CT is
unnecessary for low-voltage circuits.