Compteur de puissance multifonction Schneider PM750MG

Discontinué (abandonné en Chine le 2014-12-31). Aucune nouvelle unité originale disponible auprès du fabricant. Uniquement des pièces d'occasion ou en surplus sur le marché. La série METSEPM53 est le remplacement préféré.

Explication du code modèle

PM750: Moniteur de puissance multifonction haut de gamme de la série PM700

MG: Version communication Modbus RS485, équipé d'E/S numériques, mesure des harmoniques et enregistrement des valeurs min/max

Fonctions principales

Mesure électrique complète True RMS: 3-phase / tension monophasée, actuel, puissance active/réactive/apparente, facteur de puissance, fréquence; par phase & énergie active totale kWh, énergie réactive kvarh, demande / demande de pointe, maximum & enregistrement de la valeur minimale.
Qualité de l'alimentation: Distorsion harmonique totale (THD), analyse harmonique jusqu'au 15ème ordre, taux d'échantillonnage 32 échantillons par cycle.
Interface E/S: 2 entrées numériques (DEPUIS), 1 sortie numérique statique (FAIRE). DO configurable pour sortie d'impulsion (impulsion d'énergie), alarm output or remote control. DI for status acquisition or demand synchronization trigger.
Alarm function: 15 groups of user-defined threshold alarms (surtension, sous-tension, surintensité, power limit violation, etc.), local indication + alarm report via communication.
Communication: RS485, Modbus RTU protocol, up to 19200bps, compatible with PLC, SCADA and energy management systems.
Afficher: Écran LCD rétroéclairé, 6-line display, panel cutout mounting.

Principales spécifications électriques

Article	Caractéristiques
Measuring Voltage	Line-to-line: 10～480V AC; Phase-to-neutral:10～277V AC, 45~65Hz
Current Input	CT secondary 0.005～6A (5A/1A CT both supported)
Alimentation	CA:115~415V; CC:125~250 V; Power consumption ≤5VA
Précision	Current ±0.4%; Voltage ±0.3%; Power ±0.5%; Active energy Class 0.5S (IEC62053-22)
DEPUIS	12~36VDC, nominal 24 V CC, 2.5Isolation kV
FAIRE	Static transistor output, supports pulse / alarm mode

Application typique

LV/MV switchgear, factory power distribution room, distribution d'énergie du bâtiment, 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 (Clé)

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

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

Common Troubleshooting Checklist

No current / 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: Câblage lâche, insufficient PT/CT accuracy, heavy distortion on load side.

Notes complémentaires

Cutout dimension: 92×92mm, panel flush mounting

Normes: CEI 62053, ANSI C12.20; compatible with 3P3L /3P4L / systèmes monophasés

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

PM750MG Modbus RTU Register Summary (Registres de détention, 4xxxx, 16peu; Energy values as 32bit, occupies 2 registres consécutifs)

Protocol Notes: Modbus RTU, register starts at 40001 (Schneider standard). Some software uses 0-based addressing (40000), pay attention to offset. For float /32bit unsigned integer, mot élevé en premier. Energy registers come with multiplier register; readings must be multiplied by multiplier factor.

Version du micrologiciel: V3.050 (common firmware for PM700 series)

Modbus Address(4xxxx)	Type de données	Nom	Description
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	Actuel, 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)	par exemple. 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, Important!

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)

Protocole: Modbus RTU

Débit en bauds: 2400/9600/19200

Parité: Aucun / Impair / Même; Stop bit:1

Adresse de l'esclave: 1~247

RS485 Terminals: UN, B; 120Ω termination resistor at bus end

PM750MG vs METSEPM5330 Function & Wiring Migration Comparison Table

Article	PM750MG (Old Meter)	METSEPM5330 (Replacement Meter)	Migration Notes
Taille de découpe	92×92mm	92×92mm	Découpe de panneau identique, direct mounting
Alimentation	AC115~415V / DC125~250V	AC100~415V / DC110~250V	Power circuit can be reused directly
Voltage Input	10~480V line voltage	10~480V line voltage	PT secondary wiring unchanged; support 3P3L/3P4L
Current Input	CT secondary 0.005~6A	CT secondary 0.005~6A	CT S1/S2 wiring unchanged, CT ratio must be reconfigured on new meter
DEPUIS	2DEPUIS (24VCC)	2DEPUIS (24VCC)	External DI wiring can be kept
FAIRE	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 groupes	35 groupes	Alarm logic can be migrated, register addresses for alarms are fully different
Communication	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 tarifs	Support time-of-use metering
Précision	Active energy Class 0.5S	Active energy Class 0.5S	Same accuracy class
Enregistrement des données	Max. & Min values	Max. & Min. + 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: Rapport CT, Rapport 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
Bornes d'alimentation
DI1 DI2 COM
DO+ DO(Transistor)
RS485 A B

METSEPM5330 Terminal Layout

L1 L2 L3 N Voltage
CT1 CT2 CT3 Current
Pouvoir
DI1 DI2 COM
FAIRE1, DO2 (Relais, independent dry contact)
RS485 A B

Tension, actuel, 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, paramètres de communication).
Remove old meter, keep voltage, CT, DI and RS485 cables.
Install METSEPM5330, connect voltage, CT, DI and RS485; rework DO wiring separately.
Power up, configure CT/PT ratio, system wiring type, Adresse Modbus, baud rate and alarm thresholds.
Verify real-time measurements: tension, actuel, pouvoir; 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, THD, min/max logging. Définition du suffixe

MG: With RS485 Modbus RTU communication

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

P.: 2-channel solid-state pulse output

Liste complète des modèles

PM700 Base model, aucune communication, no pulse output
PM700CA North American base version
PM700MG Base measurement + Modbus RS485
PM700MGCA NA version + Modbus
PM700P Base model + 2 solid-state pulse outputs, aucune communication
PM700PCA NA version with pulse output
PM700PMG Base + sortie d'impulsion + Modbus RS485
PM700PMGCA NA version, impulsion + Modbus
PM710 Base measurement + Modbus RS485, no DI/DO
PM710CA NA PM710
PM710MG Mainstream domestic PM710 (Modbus)
PM710MGCA NA PM710MG
PM750 Top tier, Modbus RS485, 2DI+1DO, alarm function
PM750MG Most common domestic model (target model, Modbus version)
PM750CA NA PM750
PM750MGCA NA PM750MG

Comparison of 4 Modèles de base (Common for China Projects)

Modèle	Configuration de base	Application
PM700	Basic electrical +THD/min-max, No comms, pas de pouls	Affichage local uniquement, pas de connexion SCADA
PM700P	Électrique de base +THD, 2 sorties d'impulsions, No comms	Acquisition d'impulsions d'énergie, pas de réseau
PM710MG	Électrique de base +THD, Modbus RS485, Pas de DC/C	Acquisition d'énergie à distance, aucun point de statut n'est nécessaire
PM750MG	Entièrement électrique +THD+15ème harmonique, Modbus RS485, 2Alarmes DI+1DO+seuil	Surveillance de l'alimentation, acquisition d'état à distance, sortie d'alarme (la plus grande base installée en Chine)

Arrêt & Résumé du remplacement

Date d'arrêt en Asie-Pacifique: 2015-04-30; Amériques:2015-08-30. Pas de nouvelle production originale, seulement un excédent / pièces détachées d'occasion.

PM700 / PM700P / PM710 → METSEPM51xx (Série PM5100)

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

Remarques supplémentaires

Cette série n'a PAS de PM720/PM730/PM740. De nombreux documents sont trompeurs. La série PM700 ne dispose que de quatre plates-formes de base: PM700, PM700P, PM710, PM750.
Suffixe CA = variante ANSI nord-américaine, diffère dans la logique de câblage & tension nominale. Évitez les pièces de rechange avec suffixe CA pour les rénovations en Chine.
Tous les modèles partagent une découpe et une apparence de panneau identiques de 92 × 92 mm; only internal I/O and communication hardware differ.