Mitsubishi Electric Melsec Q Series User Manual page 26

4 Functions
(4) Restrictions for measuring data
- Measurement cannot be performed immediately after the power loading to the sequencer
system (Module ready signal is under the OFF condition).
After checking that Module ready (Xn0) is ON, obtain measuring data.
- Measurement cannot be performed immediately after operating conditions are set up to the
module. After checking that Operating condition setting completion flag (Xn9) becomes ON,
obtain measuring data.
- Behaviors during operation are as follows:
Measuring item
Current
Current demand
Voltage
Electric power,
Reactive power
Electric power demand
Electric energy
Power factor
Frequency
Behavior of the module
When the input current is less than 0.4 % of the rating current, it
becomes 0 A.
Current demand is obtained by current moving average.
Therefore, even if current is 0 A, current demand may not be 0 A.
When the input voltage is less than 10 % of the rating voltage, it
becomes 0 V.
When current is 0 A (at all phases are 0 A) or when voltage is 0 V
(all in-between wires are 0 V), it becomes 0 kW.
Electric power demand is obtained by electric power moving
average. Therefore, even if electric power is 0 kW, electric power
demand may not be 0 kW.
The electric energy is measured with a load that is about 0.4 % or
more of all load power. Even if the indicated value is "0",
measurement value will increase.
When current is 0 A (at all phases are 0 A) or when voltage is 0 V
(all in-between wires are 0 V), it becomes 100 %.
Voltage condition
When the input voltage is less than 10 % of the rating voltage, it
becomes 0 Hz.
Frequency condition
When it is less than 44.5 Hz, it is fixed to 44.5 Hz.
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