MITSUBISHI ELECTRIC Low-voltage Products
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Energy Measuring Devices Energy Measuring Module Programmable Controllers, MELSEC-Q Series


Industry's first* PLC slot mounted type Energy Measuring Module

* As of September 2010

Achieves addition of measuring instrument without any additional space

By mounting the energy measuring module onto the open slot of the base unit, measuring instrument can be added without changing the layout in the control panel.

Achieves wire savings and engineering workload reductions

With a communication unit, communication cable and creation of a communication program are no longer needed, cost reductions can be realized by wire savings and engineering workload reductions.

Allows for detailed power measurement at high-speed (250ms)

Allows for easy specific energy consumption*1 management by matching the "production information" of the CPU unit with the "energy information" of the energy measuring module.

Since measured data is automatically collected in a buffer memory at 250ms, detailed specific energy consumption management is also available.

*1 :
The specific energy consumption is a numerical value displayed by "dividing energy consumption by production volume," which is one type of index that measures energy productivity. Improving this specific energy consumption leads to improvements in productivity.

Allows for easy construction of a "visualization" system

Allows for easy graphic display of specific energy consumption with a graphic operation terminal (GOT) installed on the control panel at the manufacturing site.*2

Combination with the "high-speed data logger module (QD81DL96)" allows specific energy consumption analysis to be easily performed with a PC.*2

General Specifications & Measured Items

(1) General specifications

Item Specification
Phase wire system Single-phase 2-wire, single-phase 3-wire, 3-phase 3-wire
Single-phase 2-wire,
3-phase 3-wire
110VAC, 220VAC common use
Single-phase 3-wire 110VAC (between wires 1-2, between wires 2-3), 220VAC (between wires 1-3)
Current circuit AC50A, 100A, 250A, 400A, 600A (Dedicated split-type current sensor is used. In all cases, the current sensor's primary current is indicated.)
AC5A (Dedicated split-type current sensor is used. The 5A current sensor is used in combination with a current transformer (CT) in a two-step configuration. In this case, the maximum primary current setting is 6000A.)
Frequency 50-60Hz (automatic frequency selection)
Tolerance Main unit Current, demand current*1: ±1.0% (relative to 100% rating)
Voltage: ±1.0% (relative to 100% rating)
Power, demand power*1: ±1.0% (relative to 100% rating)
Frequency: ±1.0% (45 to 65Hz range)
Power factor: ±3.0% (relative to electrical angle of 90°)
Power level: ±2.0% (5 to 120% of rating, power factor = 1)
Reactive power level: ±2.5% (5 to 120% of rating, power factor = 0)
Number of measurement circuits 1 circuit
Data refresh period 250ms (fixed) Note: Constant cumulative count of power level and reactive power level (also includes short-cycle load changes)
Response time 2 sec or less
Power outage compensation Backup to non-volatile memory (Saved items: Setting values, max./min. values and their occurrence times, power level (regenerative, consumption), reactive power level, period power level)
Number of occupied I/O points 16 points (I/O assignment: intelligent 16 points)
*1 :
"Demand" is the moving average over the specified time period.

(2) Measuring items

Measured items
Current Single-phase current, 2-phase current*2, 3-phase current*2, total current
Current demand*1 Single-phase demand current, 2-phase demand current*2, 3-phase demand current*2, max. demand current
Min. demand current, max. demand current occurrence date/time, min. demand current occurrence date/time
Voltage Voltage between wires 1-2, voltage between wires 2-3*2, voltage between wires 3-1*2, total voltage
Max. voltage, min. voltage, max. voltage occurrence date/time, min. voltage occurrence date/time
Power Power
Demand power*1 Demand power, max. demand power, min. demand power
Max. demand power occurrence date/time, min. demand power occurrence date/time
Power factor Power factor, max. power factor, min. power factor, max. power factor occurrence date/time, min. power factor occurrence date/time
Frequency Frequency
Electric energy Electric energy (consumption), electric energy (regenerative)
Reactive energy Reactive energy (consumption lagging)
Term electric energy Term electric energy 1, term electric energy 2
*1 :
Indicates the moving average over the specified time period
*2 :
When the phase wire system is set to single-phase 2-wire, these parameters are not measured.