Schneider PM750MG Multifunction Power Meter

Снято с производства (discontinued in China on 2014-12-31). No new original units available from manufacturer. Only second-hand or surplus stock parts on market. METSEPM53 series is the preferred replacement.

Пояснение кода модели

PM750: High-end multifunction power monitor of PM700 series

МГ: Modbus RS485 communication version, equipped with digital I/O, harmonic measurement and min/max value logging

Основные функции

True RMS full electrical measurement: 3-фаза / single-phase voltage, текущий, активная/реактивная/полная мощность, коэффициент мощности, частота; phase-wise & total active energy kWh, reactive energy kvarh, demand / peak demand, максимум & minimum value recording.
Power quality: Total Harmonic Distortion (КНИ), harmonic analysis up to 15th order, sampling rate 32 samples per cycle.
Интерфейс ввода-вывода: 2 цифровые входы (ОТ), 1 static digital output (ДЕЛАТЬ). DO configurable for pulse output (energy pulse), alarm output or remote control. DI for status acquisition or demand synchronization trigger.
Функция сигнализации: 15 groups of user-defined threshold alarms (перенапряжение, пониженное напряжение, сверхток, power limit violation, и т. д.), local indication + alarm report via communication.
Коммуникация: RS485, Modbus RTU protocol, up to 19200bps, compatible with PLC, SCADA and energy management systems.
Отображать: ЖК-дисплей с подсветкой, 6-line display, panel cutout mounting.

Основные электрические характеристики

Элемент	Технические характеристики
Measuring Voltage	Line-to-line: 10~480 В переменного тока; Phase-to-neutral:10～277V AC, 45~65Hz
Токовый вход	CT secondary 0.005～6A (5A/1A CT both supported)
Источник питания	переменного тока:115~415В; округ Колумбия:125~250V; Power consumption ≤5VA
Точность	Current ±0.4%; Voltage ±0.3%; Power ±0.5%; Active energy Class 0.5S (IEC62053-22)
ОТ	12~36VDC, номинальное 24 В постоянного тока, 2.5кВ изоляция
ДЕЛАТЬ	Static transistor output, supports pulse / alarm mode

Типичное применение

LV/MV switchgear, factory power distribution room, распределение электроэнергии в здании, computer room incoming cabinet. Used for power monitoring, energy consumption statistics, power quality monitoring and status acquisition; commonly used as spare parts for legacy project retrofits.

OEM Replacement Models (Ключ)

PM750MG → METSEPM5330 (RS485 Modbus); For Ethernet version: METSEPM5340 (Модбус TCP)

PM53 series is upgraded replacement for PM750, full & enhanced function coverage, identical panel cutout size for direct mounting. Modbus register addresses are incompatible, требуется реконфигурация. High-end alternative: PM8240/PM8243.

Общий контрольный список устранения неполадок

Нет тока / reversed current reading: CT S1/S2 reversed; CT secondary shorting link not removed; CT ratio not configured in meter.
Modbus communication failure: Missing termination resistor, A/B wire reversal, mismatched address/baud rate; unstable meter supply.
DO no action: Verify DO mode configuration (pulse/alarm) and polarity of external circuit.
Abnormal harmonic reading: Ослабленная проводка, insufficient PT/CT accuracy, heavy distortion on load side.

Дополнительные примечания

Размер выреза: 92×92mm, panel flush mounting

Стандарты: МЭК 62053, ANSI C12.20; compatible with 3P3L /3P4L / однофазные системы

Second-hand spare note: LCD backlight aging, damaged RS485 transceiver chip, parameter loss due to internal battery depletion.

PM750MG Modbus RTU Register Summary (Регистры хранения, 4хххх, 16кусочек; Energy values as 32bit, занимает 2 последовательные регистры)

Protocol Notes: Модбус РТУ, register starts at 40001 (Шнайдер стандартный). Some software uses 0-based addressing (40000), pay attention to offset. For float /32bit unsigned integer, сначала высокое слово. Energy registers come with multiplier register; readings must be multiplied by multiplier factor.

Firmware version: V3.050 (common firmware for PM700 series)

Modbus Address(4хххх)	Data Type	Имя	Описание
40001	UINT16	V1 Phase Voltage	Phase voltage, multiplier register 40013
40002	UINT16	V2 Phase Voltage
40003	UINT16	V3 Phase Voltage
40004	UINT16	V12 Line Voltage
40005	UINT16	V23 Line Voltage
40006	UINT16	V31 Line Voltage
40007	UINT16	I1 Phase A Current	Текущий, multiplier register 40014
40008	UINT16	I2 Phase B Current
40009	UINT16	I3 Phase C Current
40010	UINT16	Frequency Hz
40011	UINT16	Total Active Power kW	Power multiplier 40015
40012	UINT16	Total Reactive Power kvar
40013	UINT16	Voltage Multiplier (10^n)	например. value=2 → ×100
40014	UINT16	Current Multiplier (10^n)
40015	UINT16	Power Multiplier (10^n)
40016	UINT16	Total Power Factor	Range 0~1000, divide by 1000
4,002,040,021	UINT32	Total Active Energy kWh	40020=High word,40021=Low word; multiplier 40108
4,002,240,023	UINT32	Total Reactive Energy kvarh
4,002,440,025	UINT32	Total Apparent Energy kVAh
40030	UINT16	Phase A THD	Current total harmonic distortion
40031	UINT16	Phase B THD
40032	UINT16	Phase C THD
40040	UINT16	DI Status	Bit0=DI1，Bit1=DI2
40041	UINT16	DO Status	Bit0=DO1
40045	UINT16	Alarm Status Word	Alarm mask
40108	UINT16	Energy Multiplier (10^n)	Energy reading ×10^n, Важный!

Energy Calculation Example: 40020=0012, 40021=ABCD; 40108=2 → 0x0012ABCD ×10² = 1254860 ×100 = 125486000 Wh = 125486 kWh

Harmonics: 1~15th harmonic magnitudes, registers start at 40050, per-phase harmonic amplitude.

Communication Basic Parameters (PM750MG)

Протокол: Модбус РТУ

Скорость передачи данных: 2400/9600/19200

Паритет: Никто / Странный / Даже; Stop bit:1

Slave address: 1~247

RS485 Terminals: А, Б; 120Ω termination resistor at bus end

PM750MG vs METSEPM5330 Function & Wiring Migration Comparison Table

Элемент	PM750MG (Old Meter)	METSEPM5330 (Replacement Meter)	Примечания по миграции
Размер выреза	92×92mm	92×92mm	Identical panel cutout, direct mounting
Источник питания	AC115~415V / DC125~250V	AC100~415V / DC110~250V	Power circuit can be reused directly
Входное напряжение	10~480V line voltage	10~480V line voltage	PT secondary wiring unchanged; support 3P3L/3P4L
Токовый вход	CT secondary 0.005~6A	CT secondary 0.005~6A	CT S1/S2 wiring unchanged, CT ratio must be reconfigured on new meter
ОТ	2ОТ (24В постоянного тока)	2ОТ (24В постоянного тока)	External DI wiring can be kept
ДЕЛАТЬ	1-channel static transistor output	2-channel relay DO	⚠️Major difference! PM750MG uses transistor DO; PM5330 is dry contact relay. Original DO pulse/alarm circuit needs redesign, higher load capacity.
Harmonic Measurement	Up to 15th harmonic	Up to 31st harmonic	PM5330 enhanced power quality capability
Alarm Groups	15 группы	35 группы	Alarm logic can be migrated, register addresses for alarms are fully different
Коммуникация	RS485 Modbus RTU	RS485 Modbus RTU	Physical A/B wiring unchanged. Register mapping is fully incompatible! PLC/SCADA program must be rewritten, old register addresses cannot be reused.
Energy Tariff	Single tariff	4 tariffs	Support time-of-use metering
Точность	Active energy Class 0.5S	Active energy Class 0.5S	Same accuracy class
Регистрация данных	Макс & Min values	Макс & Мин + Event log	PM5330 supports event logging

Retrofit Risk Checklist (Mandatory for Site Replacement)

DO circuit modification: PM750MG transistor output cannot drive heavy load. PM5330 uses relay. If original DO sends pulse to acquisition module, verify dry-contact pulse compatibility with acquisition device.
Host software program reconstruction: Register address, data arrangement and multiplier logic are all different. All tags for PLC / KingView / ForceControl / SCADA must be reconfigured; old program cannot be copied directly.
Parameter re-entry: Коэффициент трансформации трансформатора тока, Коэффициент PT, system type (3P3L/3P4L), alarm threshold, Modbus address and baud rate all require manual setup. Parameters from PM750MG cannot be imported into PM5330.
Real-time clock: PM750MG internal battery loses parameters on power loss; PM5330 retains parameters after power loss, only clock resets.

III. Terminal Wiring Comparison

PM750MG Terminal Layout

L1 L2 L3 N Voltage Input
CT1 CT2 CT3 Current Input
Силовые терминалы
DI1 DI2 COM
DO+ DO(Транзистор)
RS485 A B

METSEPM5330 Terminal Layout

L1 L2 L3 N Voltage
CT1 CT2 CT3 Current
Власть
DI1 DI2 COM
DO1, DO2 (Реле, independent dry contact)
RS485 A B

Напряжение, текущий, DI and RS485 cables may remain untouched; DO wiring must be rewired.

On-site Replacement Procedure
Power off and confirm safety; record original PM750MG parameters (CT/PT ratio, system type, alarm settings, параметры связи).
Remove old meter, keep voltage, Коннектикут, DI and RS485 cables.
Install METSEPM5330, connect voltage, Коннектикут, DI and RS485; rework DO wiring separately.
Power up, configure CT/PT ratio, system wiring type, Адрес Modbus, baud rate and alarm thresholds.
Verify real-time measurements: Напряжение, текущий, власть; confirm CT polarity is correct.
Modify PLC / SCADA Modbus program, debug communication.
Compare accumulated energy readings, run continuous test to verify metering accuracy.

Schneider PowerLogic PM700 Series Full Model List (All discontinued)

Series basics: 92×92mm panel mounting, True RMS measurement, КНИ, min/max logging. Suffix Definition

МГ: With RS485 Modbus RTU communication

Калифорния: North American ANSI version (rarely used in China; Chinese projects prefer models without CA suffix)

П: 2-channel solid-state pulse output

Полный список моделей

PM700 Base model, нет связи, нет импульсного выхода
PM700CA North American base version
PM700MG Base measurement + RS485 Modbus
PM700MGCA NA version + Модбус
PM700P Base model + 2 solid-state pulse outputs, нет связи
PM700PCA NA version with pulse output
PM700PMG Base + импульсный выход + RS485 Modbus
PM700PMGCA NA version, пульс + Модбус
PM710 Base measurement + RS485 Modbus, no DI/DO
PM710CA NA PM710
PM710MG Mainstream domestic PM710 (Модбус)
PM710MGCA NA PM710MG
PM750 Top tier, RS485 Modbus, 2DI+1DO, функция будильника
PM750MG Most common domestic model (целевая модель, Modbus version)
PM750CA NA PM750
PM750MGCA NA PM750MG

Comparison of 4 Основные модели (Common for China Projects)

Модель	Базовая конфигурация	Приложение
PM700	Basic electrical +THD/min-max, No comms, no pulse	Local display only, no SCADA connection
PM700P	Basic electrical +THD, 2 pulse outputs, No comms	Energy pulse acquisition, no network
PM710MG	Basic electrical +THD, RS485 Modbus, No DI/DO	Remote power acquisition, no status points needed
PM750MG	Full electrical +THD+15th harmonic, RS485 Modbus, 2DI+1DO+threshold alarms	Power monitoring, remote status acquisition, выход тревоги (largest installed base in China)

Прекращение производства & Replacement Summary

APAC discontinuation date: 2015-04-30; Americas:2015-08-30. No new original production, только излишек / б/у запасные части.

PM700 / PM700P / PM710 → METSEPM51xx (PM5100 series)

PM750 / PM750MG → METSEPM53xx (METSEPM5330 RS485; METSEPM5340 Ethernet TCP)

Дополнительные замечания

This series does NOT have PM720/PM730/PM740. Many documents are misleading. PM700 series only has four base platforms: PM700, PM700P, PM710, PM750.
CA suffix = North American ANSI variant, differs in wiring logic & номинальное напряжение. Avoid CA-suffix spares for China retrofits.
All models share identical 92×92mm cutout and panel appearance; only internal I/O and communication hardware differ.