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Single-phase energy meter for energy measurement on board trains
| Nominal Characteristics | AC 15 kV / 16.7 Hz · 25 kV / 50 Hz · DC 750 V / 1.5 kV / 3 kV |
| Accuracy | Class 0.5 R (as per EN 50463-2) |
| Operating Temperature Range | -40 °C … +75 °C |
| Measuring Input Channels | 4 galvanically isolated inputs for U- and I-sensors (AC, DC or ACDC) |
| Rated Voltage (secondary) | AC: 70 – 300 V or 17,9 – 100 mA; DC: 17,9 – 100 mA |
| Rated Current (secondary) | AC: 50 – 2000 mA or 5 A; DC: 50 – 2000 mA |
Railway applications — on-board energy measurement for multi-system traction vehicles.
The EM4TII AC-MS DC-MS +XPS 110VDC, RS232 is a None current transducer from LEM for the electronic measurement of Active and reactive energy, with galvanic isolation.
The accuracy class is 0.5 R (as per EN 50463-2). Typical applications include Multi-System Locomotives, Traction Energy Metering & Billing and Railway Vehicles (25 kV / 15 kV AC, 750 V / 1.5 kV / 3 kV DC).
The EM4TII+ is a single-phase energy meter as per EN 50463:2017, meeting the requirements of EU directive 1302/2014/EU for energy measurement on board trains. It processes signals from transformer-based and electronic transducer systems for current and voltage, and generates a load profile from the calculated energy values — consumed and regenerated active and reactive energy are recorded in separate registers and stored for at least 300 days at the default 5-minute period length.
Designed for multi-system vehicles, the meter operates on 25 kV / 50 Hz and 15 kV / 16.7 Hz AC networks as well as 750 V, 1.5 kV and 3 kV DC systems; a system change is detected automatically and recorded in the load profile and the logbook. All measured and stored data can be read out via serial interfaces (RS232, RS422 or RS485) using the IEC 62056-21 protocol, and an RS232 GPS input (NMEA 0183) provides location coordinates and automatic clock synchronisation.
The compact, fireproof housing is protected to IP65 and meets the railway requirements of EN 50155, EN 50121-3-2, EN 50124-1 and EN 61373 (shock and vibration tested to category 1, class B). The supply voltage can be selected between 24 V and 110 V as per EN 50155 — this variant is factory-configured for 110 V DC supply with an RS232 communication interface.
| General Information | |
|---|---|
| Manufacturer | LEM |
| Product Series | EM4 |
| Product Reference | EM4TII AC-MS DC-MS +XPS 110VDC, RS232 |
| Max. Traction System Voltage | 25 kV AC / 3 kV DC |
| Supply Voltage | 24 – 48 V or 72 – 110 V (as per EN 50155); this unit: 110 V DC |
| Measurement | Active and reactive energy (consumed and regenerated) |
| Mounting | Wall mounting (three-point, as per DIN 43857-2) |
| Application Domain | Railway traction — on-board energy measurement |
| Technical Data | |
|---|---|
| Measuring Input Channels | 4 galvanically isolated inputs for U- and I-sensors (AC, DC or ACDC) |
| Rated Voltage (secondary) | AC: 70 – 300 V or 17,9 – 100 mA; DC: 17,9 – 100 mA |
| Rated Current (secondary) | AC: 50 – 2000 mA or 5 A; DC: 50 – 2000 mA |
| Accuracy Class | 0.5 R (as per EN 50463-2) |
| Frequency | DC, 16.7 Hz, 50 Hz and 60 Hz |
| Load Profile | Active and reactive energy (kWh / kvarh); period length min. 1 minute |
| Memory Depth | At least 300 days (5-minute period length) |
| Clock Accuracy | < 20 ppm |
| Interfaces | 1 × RS232 / RS422 / RS485 (bidirectional); 1 × RS232 for GPS (NMEA 0183) |
| Display | LCD, self-luminous, letter height approx. 4 mm |
| Degree of Protection | IP65 |
| Supply Voltage | 24 – 48 V or 72 – 110 V (as per EN 50155); this unit: 110 V DC |
| Power Consumption | 3 W (without modem) |
| Inrush Current | 500 mA max (without modem supply) |
| Operating Temperature | -40 °C … +75 °C |
| Storage Temperature | -40 °C … +85 °C |
| Weight | approx. 1.5 kg |
Note: Specifications are taken from the official EM4TII AC-MS DC-MS +XPS 110VDC, RS232 datasheet. Parameters that could not be confirmed from the datasheet are marked UNVERIFIED.
Official technical documentation for the EM4TII AC-MS DC-MS +XPS 110VDC, RS232.
Outline dimensions, pin layout and connection diagrams of the EM4TII AC-MS DC-MS +XPS 110VDC, RS232 are shown below.
| Outline Dimensions & Mechanical Data | |
|---|---|
| Weight | approx. 1.5 kg |
Note: All dimensions are in millimetres. Refer to the official datasheet for the complete dimension drawing.
Typical applications of the EM4TII AC-MS DC-MS +XPS 110VDC, RS232.
Characteristic curve diagrams are not included in the EM4TII AC-MS DC-MS +XPS 110VDC, RS232 datasheet; the relevant characteristics are the accuracy and dynamic performance data listed below.
| Accuracy & Dynamic Characteristics | |
|---|---|
| Accuracy Class | 0.5 R (as per EN 50463-2) |
| Clock Accuracy | < 20 ppm |
| Reference Conditions | |
|---|---|
| Ambient Temperature (TA) | 25 °C, unless otherwise noted |
| Accuracy Class | 0.5 R (as per EN 50463-2) |
Note: For the full set of performance data, refer to the datasheet.
