Micrologic X Control Unit Measurements

A Masterpact MTZ device with embedded current sensors and Micrologic X control unit is a power metering device complying with IEC/EN 61557-12, Class 0.5 accuracy for voltage and current and Class 1 accuracy for active power and energy measurements. For each measurement the accuracy is certified within a temperature range of -25 to 70°C (-13 to 158°F).

Measurements and Electrical Parameters Calculated by the Control Unit

Based on the measurement of line currents, neutral current, phase-to-phase voltages and phase-to-neutral voltages, a Micrologic X control unit calculates* and displays parameters required to monitor any AC electrical power system:

RMS values of current and voltage
Active, reactive and apparent power
Active, reactive and apparent energy
Power factor
Frequency
Phase sequence
Voltage unbalance, current unbalance
Current demand
Total active, reactive and apparent power demand
THD of voltage and current

The calculation of current and power demand are performed in compliance with IEC/EN 61557-12.

Thermal Demand

Demand Calculated with a Sliding Block Interval

Electrical values calculated by Micrologic X control units can be shown on the embedded HMI display, a smart device via Bluetooth, embedded web pages of Ethernet gateways, a PC running Ecoreach software and on the FDM128 display unit. They are refreshed every 2 seconds. The display on the embedded HMI allows easy navigation through the electrical values and access to a Quickview option for the main basic values.

Micrologic X control units log and time stamp minimum and maximum values since the last reset of all relevant measurements: currents, voltages, frequency, active power, reactive power, apparent power, total current harmonic distortion (THDI), total voltage harmonic distortion (THDV).... For the complete list of measurements and min / max values, see the Micrologic X User Guide (DOCA0102EN). The maximum and minimum values are resettable from the embedded display, a smart device via Bluetooth technology or a PC running Ecoreach software.

An optional external 24 Vdc power supply or the optional VPS module is required to process and display measurements below 20% of the rated current .

The phase-to-neutral voltages are available for four-pole and three-pole circuit breakers providing the connection of the VN terminal of Micrologic X control units to the neutral. For accuracy of the active power measurement the connection of the VN terminal of Micrologic X control units to the neutral is necessary. Please refer to the user guide (DOCA0102EN) for more details concerning the wiring and configuration of Micrologic X control units.

Energy Management Functions of Micrologic X Control Unit

Embedded sensors

A Masterpact MTZ device equipped with a Micrologic X control unit and its own embedded sensors is a Class 1 full chain measurement device for active power and energy metering*.

Embedded power metering avoids variation and uncertainty due to external sensors and wiring.

Effect of Temperature on Masterpact MTZ Circuit Breaker Measurement

The effect of the temperature on accuracy of the measurement has been carefully managed to maintain an operating temperature between -25°C and 70°C (-13°F and 158°F).

Micrologic X Control Unit Measurement Values

Type of Measurement	Symbol	Accuracy	Range Min Acc	Range Max Acc	Unit	EHMI *
Currents
RMS Current of Phases	I1, I2, I3, Iavg	±0.5%	40 *	4,000 x 1.2 *	A
Voltages
RMS Phase-to-Phase Voltage	V12, V23, V31, VLL average	±0.5%	208	690 x 1.2	V
RMS Phase-to-Neutral Voltage	V1N, V2N, V3N, VLN average*	±0.5%	120	400 x 1.2	V
Power and Energy
Active Power	P1, P2, P3, Ptot	±1 %	5	10,000	(±) kW
Reactive Power	Q1, Q2, Q3, Qtot	±2%	5	10,000	(±) kVAR
Apparent Power	S1, S2, S3, Stot	±1%	5	10,000	kVA
Power Factor	PF	±0.02	-1	1		—
Power Factor / Phase	PF1, PF2, PF3	±0.02	-1	1
Fundamental Power Factor (cos φ or DPF)	Cos φ	±0.02	-1	1		—
Fundamental Power Factor (cos φ or DPF) / Phase	Cos φ1, Cos φ2, Cos φ3	±0.02	-1	1
Active Energy With reset.*	Ep IN / OUT / total IN+OUT or IN-OUT according to setting.*	±1%	0	10,000,000	kWh
Reactive EnergyWith reset.*	Eq IN / OUT / total IN+OUT or IN-OUT according to setting.*	±2%	0	10,000,000	kVARh
Apparent Energy With reset.*	Es IN / OUT / total IN+OUT or IN-OUT according to setting.*	±1%	0	10,000,000	kVAh
Active Energy Without reset.*	Ep IN / OUT / total IN+OUT or IN-OUT according to setting.*	±1%	0	10,000,000	kWh	—
Reactive Energy Without reset.*	Eq IN / OUT / total IN+OUT or IN-OUT according to setting.*	±2%	0	10,000,000	kVARh	—
Apparent Energy Without reset.*	Es IN / OUT / total IN+OUT or IN-OUT according to setting.*	±1%	0	10,000,000	kVAh	—
Current and Power Demands
Current demands	I1, I2, I3, IN, Iavg	±0.5%	40 *	4,000 x 1.2 *	A	—
Total active power demand	Ptot	±1%	5	10,000	(±) kW	—
Total reactive power demand	Qtot	±2%	5	10,000	(±) kVAR	—
Total apparent power demand	Stot	±1%	5	10,000	kVA	—
Power Quality
Frequency	F	±0.005	40	70	Hz
Phase Sequence (0: a,b,c /1,2,3 - 1: a,c,b /1,3,2)	Phase sequence	NA	1 2 3	1 3 2	0 - 1
RMS Current on Neutral	IN Neutral current available only with 4 pole circuit breakers or 3 pole circuit breakers with External Neutral Current Transformer (ENCT). *	±1%	40 *	4,000 *	A
RMS Current on Ground Current	Ig	±5%	40 *	4,000 *	A
THDI Current Phase	ITHD I1, I2, I3, Iavg	Cl 5 According IEC/EN 61557-12.*	0 %	100 % *	% *		*
THDI I Neutral	ITHD IN Neutral current available only with 4 pole circuit breakers or 3 pole circuit breakers with External Neutral Current Transformer (ENCT). *	Cl 5 According IEC/EN 61557-12.*	0%	100% *	%*		*
THDU Phase-to-Phase voltage	VTHD V12,23,31, LLavg	Cl 2 According IEC/EN 61557-12.*	0%	20% *	%*		*
THDV Phase-N Voltages	VTHD V1N,2N,3N, LNavg *	Cl 2 According IEC/EN 61557-12.*	0%	20% *	%*		*
Current Unbalance vs Average 3 Phase RMS Currents	I_unbal 1,2,3, Iunbal (worst)	+5%	0%	100%	%
Phase-to-Phase Voltage Unbalance	VLL_Unbal 12 23 31 unbal	Cl 0.5	0%	10%	%
Phase-to-Neutral Voltage Unbalance	VLN_Unbal 1N, 2N 3N, unbal*	Cl 0.5	0%	10%	%
NOTE: Micrologic X control units log and time stamp minimum and maximum values since last reset of all relevant measurements. Main maximum values may be read on embedded HMI (Currents, Voltages, Frequence, Ptotal, Qtotal, THDIavg, THDUavg,THDIN ...). For a complete list of measurements and min / max values, see the Micrologic X User Guide DOCA0102EN.