Light Stream Electric Meter LITE - Technical datasheet
Features
Per-phase energy metering
Counts the energy consumed separately for each phase and the total across all three. Accuracy class 0.5S for active energy and 1 for reactive energy.
All grid parameters in one device
Voltage, current, power (active, reactive, apparent, non-active), power factor, phase angles between current and voltage, frequency.
Bidirectional metering
Counts the energy drawn from the grid and the energy fed back into it. Accumulated values are not lost on power loss or firmware updates.
Power quality monitoring
Detects short current and voltage surges from 300 µs and stores the maximum value for the period — a spike is never missed between polls.
No external transformers needed
Three current transformers are built into the housing: a phase wire up to 9.5 mm is passed through the hole. Current up to 125 A is measured directly.
High currents
For currents above 125 A, it works with external transformers with a 5 A output and immediately outputs real values taking the ratio into account.
Three phases or one
Works as a single three-phase meter or as three single-phase meters. A phase wiring error can be corrected in the settings without rewiring.
Data to the control system
RS-485 with the Modbus RTU protocol, isolated from the mains. Measurements are updated every 320 ms, energy values instantly.
Dimensions
75 × 90 × 58 mm
Technical specifications
Ergonomics
| Parameter | Value |
|---|---|
| Mounting | 35 mm DIN rail |
| Overall dimensions (W × H × D) | 75 mm • 90 mm • 58 mm |
| Weight (with box) | 195 g |
| Indication | S — Modbus exchange; CF1 — energy pulses |
Measurement
| Parameter | Value |
|---|---|
| Accuracy class | 0.5S (active), 1 (reactive) |
| Channels | 1 three-phase or 3 single-phase |
| Current transformers | built-in, no calibration needed |
| Rated current | 5 A |
| Maximum current | 125 A |
| Cable diameter through the transformer | up to 9.5 mm |
| Current and voltage surges | from 300 µs |
| Measurement update rate | 320 ms |
| CF1 pulse indicator | 1000 pulses/kWh |
Interfaces
| Parameter | Value |
|---|---|
| Interface | RS-485, galvanically isolated |
| Power and RS-485 terminals | V+, GND, A, B; 3.5 mm pitch |
| Power terminals | L1, L2, L3, N, PE |
| Wire gauge with ferrule | control: 0.35–1 mm²; power: up to 2.5 mm² |
| Tightening torque | 0.2 N·m (control), 0.5 N·m (power) |
Power supply
| Parameter | Value |
|---|---|
| Interface section | 5.5–28 V DC |
| Measurement section | 90–510 V AC, from any phase |
| Short-term on L1, L2, L3 | 1200 V for 10 ms |
| Consumption | 0.9 W (average), 1.3 W (max) |
| Ready after power-on | ~2 s |
Modbus
| Parameter | Value |
|---|---|
| Protocol | Modbus RTU |
| Address | 1–247, factory default on the label on the side of the housing |
| Baud rate | 1200–115,200 bps, default 9600 |
| Default format | 8N2 |
| Firmware update | via RS-485 |
Operating conditions
| Parameter | Value |
|---|---|
| Temperature | from −40 to +80 °C |
| Humidity | up to 92%, non-condensing |
| Climatic design category (GOST 15150-69) | O2.1* |
| Service life | 16 years |
Wiring
| Terminals | Purpose |
|---|---|
| V+, GND | power for the interface section, 5.5–28 V DC |
| A, B | RS-485 bus |
| L1, L2, L3 | phases A, B, C |
| N | neutral |
| PE | protective earth |
| Transformers L1(A), L2(B), L3(C) | the phase wire is passed through in the direction of the arrow towards the load |
In a single-phase network, the phase is connected to L1.
Caution
- Be sure to connect the PE terminal to protective earth and N to the neutral.
- Modbus communication requires 5.5–28 V DC power on V+ and GND — power from the phases alone is not enough.
- The secondary winding of an external current transformer must always be either short-circuited or connected to the device — otherwise the transformer will be damaged.
- This is a technical metering device; it does not replace the utility company's billing meter.
Package contents
- Light Stream Electric Meter LITE
Maintenance
Connecting cables and wires must be in good condition and securely fastened. If the device works properly and no new features are needed, installing updates is not required. Before updating, it is recommended to back up the settings so that you can return to the previous version.
Safety
- Do not expose the device to rain or moisture — this will void the warranty.
- Do not remove the cover: there are no user-serviceable parts inside.
- Never connect the device to a dimmer.
- Never connect 0 V to electrical ground.
Warranty
3-year limited manufacturer's warranty (2 years for products sold before 30.09.2024).
Warranty service is not provided:
- for mechanical and other damage to the product caused by the buyer;
- for lamps, fuses, galvanic isolation and protection components;
- if the product was repaired by the buyer or by third parties;
- if the design of the product was modified;
- for equipment operated in violation of the power quality and capacity requirements of GOST 13109-97, under emergency conditions, or exposed to lightning strikes, fire or other extreme conditions;
- for product accessories (including cables, external power supplies, packaging) and parts not included in the delivery;
- if the wiring diagram or the rules of storage, transportation and operation were violated;
- if the product was exposed to chemicals or abrasive cleaning agents;
- if the product was used for purposes other than those stated in the datasheet;
- for damage caused by natural disasters or fire;
- if the manufacturer's (supplier's) label is missing.