9
Troubleshooting
QE81WH4W
Q
What kind of time is “response time”?
A
“Response time” is a period of time between a point of sudden change of voltage or current input and a
point that an output (computation result) follows up to within± 10% of input.
Response
time
100%
90%
Actual
value
Measured value of the module
Time
9.3.3 Q&A about Installing
Q
What is wire diameter that allows installing a current sensor?
A
The following lists the nominal cross-sectional areas of the conductor of 600-V vinyl coated wires that can
penetrate (values for reference).
IV wire (600-V vinyl insulated wire)
60
mm
2
(EMU-CT50/CT100), 150 mm
2
(EMU-CT250)
500
mm
2
× 1 wire, 325 mm
2
× 2 wires (EMU-CT400/CT600)
CV wire (600-V vinyl insulated wire)
38
mm
2
(EMU-CT50/CT100), 150 mm
2
(EMU-CT250,100 mm
2
is recommended)
500
mm
2
× 1 wire, 325 mm
2
× 2 wires (EMU-CT400/CT600)
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?
A
Models EMU2-CT5-4W, EMU-CT50, EMU-CT100, EMU-CT250, EMU-CT400 and EMU-CT600 are
split-type. If split surfaces are not engaged sufficiently or a foreign object exists between the split
surfaces, adequate performances are not obtained. Pay attention in installation.
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