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9
Troubleshooting
QE81WH4W
9.3.4 Q&A about Connection
Q
Does polarity exist in connection between a current sensor and the module?
A
Yes, it does.
Make connections so that secondary terminals of current sensor (k, l) and terminal symbols of module
agree 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
Does polarity exist in connection between a voltage transform unit and the module?
A
Yes, it does.
Make connections so that output terminals of voltage transform unit (PA, PB, PC, PD) and terminal
symbols of module agree with each other.
If polarity is incorrect, the voltage value, the electric power and the electrical energy can not be measured
correctly.
Q
Are there any key points in avoiding errors in wiring?
A
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.
Check the current sensor and the module are connected correctly for the 1-side circuit, 2-side circuit, and
3-side circuit.
Besides, check that voltage inputs for voltage transform unit are connected correctly among P1, P2, P3,
and P0.
Q
How do wires extend between a current sensor and the module?
A
Model EMU2-CT5-4W is extendable up to 11 m, using together with a cable supplied with the sensor. To
extend the wire further, use the current transformer CW-5S(L) for split-type instrument in combination,
extending the secondary wiring on CW-5S(L) side.
9.3.5 Q&A about Setting
Q
Is the setting required?
A
At least, settings of, primary current and input voltage are required. Specify settings in accordance with a
circuit to be connected.
Q
If a primary current setting value is different from that of rated current on a connected current
sensor, does it cause a breakdown?
A
It does not cause breakdown or burning. However, measurement values will be totally incorrect.
