Mitsubishi Electric MELSEC iQ-R Series User Manual page 142

Section 8 TROUBLESHOOTING
8.3.2 Q&A about Specifications
Q What accuracy does "measuring accuracy" mean?
In terms of the amount of electricity, it means a range of tolerances in reading values. For example, when
the reading value is "10 kWh," a tolerance is ±0.2 kWh.
A
In terms of measuring items other than the amount of electricity, it means tolerance for the rated input. As
to the current, when a rated current is set to 250 A, ±1% of 250 A is a tolerance.
Q Is accuracy of a current sensor included?
Accuracy of a current sensor is not included in accuracy of the module.
A
A maximum value of tolerance is obtained by summing tolerance of the module and that of a current sensor.
Q To what degree an area of micro current is measured?
A current value is measured from the area exceeding 0.4% of the rated current. In an area below 0.4%,
measurement result is indicated as "0" (zero).
A
However, the amount of electricity is still being measured in that case. Even if the indicated value is "0,"
measurement value will increase in continuing measurement for a long time.
The amount of electricity is measured with a load that is about 0.4% or more of all load power.
Q
What kind of time is "response time"?
"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.
100%
90%
A
Q When the "MEA" LED flashes?
When calculated value is low, "MEA"LED, "R"LED, "1"LED and "3"LED are looked like flashing.
Comparing to the last value per measuring cycle, LEDs light while calculating, then LEDs light off upon no
A
changes.
Since measuring cycle is shortest as 10ms, short period setting seems like flashing.
Response
time
Actual
value
141
Measured value of the module
RE81WH
Time