Mitsubishi Electric MELSEC iQ-R Series User Manual page 143

Section 8 TROUBLESHOOTING
8.3.3 Q&A about Installing
Q What is wire diameter that allows installing a current sensor?
The nominal cross-sectional areas of the conductor of 600-V vinyl coated wires that can penetrate (values
for reference), refer to "6.3.4"
A
The above shows the standard nominal cross-sectional areas. Due to the outer difference of finished vinyl
insulation and deformation (bending) depending on manufacturers, a wire may not penetrate.
Make verification on site.
Q What are the points when installing a current sensor?
Dedicated current sensor is split-type. If split surfaces are not engaged sufficiently or a foreign object exists
A
between the split surfaces, adequate performances are not obtained. Pay attention for installation.
8.3.4 Q&A about Connection
Q Does polarity exist in connection between a current sensor and the module?
Yes, it does.
Make connections so that secondary terminals of current sensor (k, l) and terminal symbols of module
A
conform with each other.
If polarity is incorrect, the current value is measurable, but the electric power and the electrical energy can
not be measured correctly.
Q Are there any key points in avoiding errors in wiring?
Check polarity of current sensor on the primary current side.
Power supply side of the circuit is indicated as "K," and the load is indicated as "L." An arrow indicates the
direction from K to L.
A
For a 3-wire circuit, check that the current sensor and the module are connected correctly for the 1-side
circuit and 3-side circuit.
Besides, check that voltage inputs are connected correctly among P1, P2, and P3.
Q How do wires extend between a current sensor and the module?
Dedicated current sensor (excludes EMU2-CT5) is extendable up to 50 m.
Model EMU2-CT5 is extendable up to 11 m, using together with extension cable. To extend the wire further,
A
use the current transformer CW-5S(L) for split-type instrument in combination, extending the secondary
wiring on CW-5S(L) side.
8.3.5 Q&A about Setting
Q Is the setting required?
At least, settings of phase wires, primary current and primary voltage are required. Perform settings in
A
accordance with a circuit to be connected.
If a primary current setting value is different from that of rated current on a connected current sensor, does
Q
it cause a breakdown?
A It does not cause breakdown or burning. However, measurement values will be totally incorrect.
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