Lumel N43
DIN rail three-phase network meter for voltage, current, power, energy and THD.
The Lumel N43 is a DIN rail network meter that measures voltage, current, power, energy, power factor and THD in three-phase 3-wire and 4-wire networks. This Modbus RTU template reads all measured values, demand values, energy counters and status and lets you change transformer ratios, alarms and communication from ModbusCloud.
- Protocol
- Modbus RTU
- Connection
- RS485, 9600 baud
- Registers
- 201, read and write
- Brand
- Lumel
- Key readings
- Phase voltages · Phase currents · Active power · Power factor · Frequency · Imported active energy · Voltage and current THD · Active power demand
- Available commands
- Transformer ratios · Alarm outputs · Communication settings · Energy reset
- Compatible models
- N43 1/5 A · N43 63 A
- Last updated
Registers (201)
201 read, 129 write
| Name | Unit | Access | Address (Hidden until you enter your email) | Function (hidden) | Type (hidden) |
|---|---|---|---|---|---|
| L1 Voltage | V | Read | |||
| L1 Current | A | Read | |||
| L1 Active Power | W | Read | |||
| L1 Reactive Power | var | Read | |||
| L1 Apparent Power | VA | Read | |||
| L1 Power Factor | Read | ||||
| L1 Tan Phi | Read | ||||
| THD U1 | % | Read | |||
| THD I1 | % | Read | |||
| L2 Voltage | V | Read | |||
| L2 Current | A | Read | |||
| L2 Active Power | W | Read | |||
| L2 Reactive Power | var | Read | |||
| L2 Apparent Power | VA | Read | |||
| L2 Power Factor | Read | ||||
| L2 Tan Phi | Read | ||||
| THD U2 | % | Read | |||
| THD I2 | % | Read | |||
| L3 Voltage | V | Read | |||
| L3 Current | A | Read | |||
| L3 Active Power | W | Read | |||
| L3 Reactive Power | var | Read | |||
| L3 Apparent Power | VA | Read | |||
| L3 Power Factor | Read | ||||
| L3 Tan Phi | Read | ||||
| THD U3 | % | Read | |||
| THD I3 | % | Read | |||
| Mean 3-Phase Voltage | V | Read | |||
| Mean 3-Phase Current | A | Read | |||
| Total Active Power | W | Read | |||
| Total Reactive Power | var | Read | |||
| Total Apparent Power | VA | Read | |||
| Total Power Factor | Read | ||||
| Mean Tan Phi | Read | ||||
| Frequency | Hz | Read | |||
| Voltage L1-L2 | V | Read | |||
| Voltage L2-L3 | V | Read | |||
| Voltage L3-L1 | V | Read | |||
| Mean Phase-to-Phase Voltage | V | Read | |||
| Active Power Demand | W | Read | |||
| Apparent Power Demand | VA | Read | |||
| Current Demand | A | Read | |||
| THD U Mean | % | Read | |||
| THD I Mean | % | Read | |||
| Neutral Current | A | Read | |||
| Active Energy Import Overflows | MWh | Read | |||
| Active Energy Import | kWh | Read | |||
| Active Energy Export Overflows | MWh | Read | |||
| Active Energy Export | kWh | Read | |||
| Reactive Inductive Energy Overflows | kvarh | Read | |||
| Reactive Inductive Energy | kvarh | Read | |||
| Reactive Capacitive Energy Overflows | kvarh | Read | |||
| Reactive Capacitive Energy | kvarh | Read | |||
| Apparent Energy Overflows | kVAh | Read | |||
| Apparent Energy | kVAh | Read | |||
| Time Seconds | s | Read | |||
| Time Hours Minutes | Read | ||||
| Mean 3-Phase Current Max | A | Read | |||
| Max Voltage | V | Read | |||
| Active Power Demand Min | W | Read | |||
| Active Power Demand Max | W | Read | |||
| Apparent Power Demand Max | VA | Read | |||
| Current Demand Max | A | Read | |||
| Status Register 1 | Read | ||||
| Status Register 2 Alarms | Read | ||||
| Consumed Active Energy | kWh | Read | |||
| Released Active Energy | kWh | Read | |||
| Reactive Inductive Energy Counter | kvarh | Read | |||
| Reactive Capacitive Energy Counter | kvarh | Read | |||
| Apparent Energy Counter | kVAh | Read | |||
| Password Protection | Read and write | ||||
| Connection Type | Read and write | ||||
| Current Input Range | Read and write | ||||
| Current Transformer Ratio | Read and write | ||||
| Voltage Transformer Ratio | Read and write | ||||
| Averaging Time | Read and write | ||||
| Clock Synchronization | Read and write | ||||
| Energy Counters Erase | Read and write | ||||
| Demand Erase | Read and write | ||||
| Min Max Erase | Read and write | ||||
| Alarm Latch Erase | Read and write | ||||
| Alarm 1 Quantity | Read and write | ||||
| Alarm 1 Type | Read and write | ||||
| Alarm 1 Lower Threshold | Read and write | ||||
| Alarm 1 Upper Threshold | Read and write | ||||
| Alarm 1 Activation Delay | s | Read and write | |||
| Alarm 1 Deactivation Delay | s | Read and write | |||
| Alarm 1 Reactivation Lock | s | Read and write | |||
| Alarm 1 Latch | Read and write | ||||
| Alarm 2 Quantity | Read and write | ||||
| Alarm 2 Type | Read and write | ||||
| Alarm 2 Lower Threshold | Read and write | ||||
| Alarm 2 Upper Threshold | Read and write | ||||
| Alarm 2 Activation Delay | s | Read and write | |||
| Alarm 2 Deactivation Delay | s | Read and write | |||
| Alarm 2 Reactivation Lock | s | Read and write | |||
| Alarm 2 Latch | Read and write | ||||
| Alarm 3 Quantity | Read and write | ||||
| Alarm 3 Type | Read and write | ||||
| Alarm 3 Lower Threshold | Read and write | ||||
| Alarm 3 Upper Threshold | Read and write | ||||
| Alarm 3 Activation Delay | s | Read and write | |||
| Alarm 3 Deactivation Delay | s | Read and write | |||
| Alarm 3 Reactivation Lock | s | Read and write | |||
| Alarm 3 Latch | Read and write | ||||
| Pulse Output Impulses | Read and write | ||||
| Modbus Address | Read and write | ||||
| Transmission Mode | Read and write | ||||
| Baud Rate | Read and write | ||||
| Apply Transmission Parameters | Read and write | ||||
| Restore Standard Parameters | Read and write | ||||
| Clock Time | Read and write | ||||
| Serial Number | Read | ||||
| Software Version | Read | ||||
| Backlight | s | Read and write | |||
| Automatic Page Switch | s | Read and write | |||
| Enabled Pages | Read and write | ||||
| Page 1 Display 1 | Read and write | ||||
| Page 1 Display 2 | Read and write | ||||
| Page 1 Display 3 | Read and write | ||||
| Page 1 Display 4 | Read and write | ||||
| Page 1 Display 5-6 | Read and write | ||||
| Page 1 Display 5 | Read and write | ||||
| Page 1 Display 6 | Read and write | ||||
| Page 2 Display 1 | Read and write | ||||
| Page 2 Display 2 | Read and write | ||||
| Page 2 Display 3 | Read and write | ||||
| Page 2 Display 4 | Read and write | ||||
| Page 2 Display 5-6 | Read and write | ||||
| Page 2 Display 5 | Read and write | ||||
| Page 2 Display 6 | Read and write | ||||
| Page 3 Display 1 | Read and write | ||||
| Page 3 Display 2 | Read and write | ||||
| Page 3 Display 3 | Read and write | ||||
| Page 3 Display 4 | Read and write | ||||
| Page 3 Display 5-6 | Read and write | ||||
| Page 3 Display 5 | Read and write | ||||
| Page 3 Display 6 | Read and write | ||||
| Page 4 Display 1 | Read and write | ||||
| Page 4 Display 2 | Read and write | ||||
| Page 4 Display 3 | Read and write | ||||
| Page 4 Display 4 | Read and write | ||||
| Page 4 Display 5-6 | Read and write | ||||
| Page 4 Display 5 | Read and write | ||||
| Page 4 Display 6 | Read and write | ||||
| Page 5 Display 1 | Read and write | ||||
| Page 5 Display 2 | Read and write | ||||
| Page 5 Display 3 | Read and write | ||||
| Page 5 Display 4 | Read and write | ||||
| Page 5 Display 5-6 | Read and write | ||||
| Page 5 Display 5 | Read and write | ||||
| Page 5 Display 6 | Read and write | ||||
| Page 6 Display 1 | Read and write | ||||
| Page 6 Display 2 | Read and write | ||||
| Page 6 Display 3 | Read and write | ||||
| Page 6 Display 4 | Read and write | ||||
| Page 6 Display 5-6 | Read and write | ||||
| Page 6 Display 5 | Read and write | ||||
| Page 6 Display 6 | Read and write | ||||
| Page 7 Display 1 | Read and write | ||||
| Page 7 Display 2 | Read and write | ||||
| Page 7 Display 3 | Read and write | ||||
| Page 7 Display 4 | Read and write | ||||
| Page 7 Display 5-6 | Read and write | ||||
| Page 7 Display 5 | Read and write | ||||
| Page 7 Display 6 | Read and write | ||||
| Page 8 Display 1 | Read and write | ||||
| Page 8 Display 2 | Read and write | ||||
| Page 8 Display 3 | Read and write | ||||
| Page 8 Display 4 | Read and write | ||||
| Page 8 Display 5-6 | Read and write | ||||
| Page 8 Display 5 | Read and write | ||||
| Page 8 Display 6 | Read and write | ||||
| Page 9 Display 1 | Read and write | ||||
| Page 9 Display 2 | Read and write | ||||
| Page 9 Display 3 | Read and write | ||||
| Page 9 Display 4 | Read and write | ||||
| Page 9 Display 5-6 | Read and write | ||||
| Page 9 Display 5 | Read and write | ||||
| Page 9 Display 6 | Read and write | ||||
| Page 10 Display 1 | Read and write | ||||
| Page 10 Display 2 | Read and write | ||||
| Page 10 Display 3 | Read and write | ||||
| Page 10 Display 4 | Read and write | ||||
| Page 10 Display 5-6 | Read and write | ||||
| Page 10 Display 5 | Read and write | ||||
| Page 10 Display 6 | Read and write | ||||
| Page 11 Display 1 | Read and write | ||||
| Page 11 Display 2 | Read and write | ||||
| Page 11 Display 3 | Read and write | ||||
| Page 11 Display 4 | Read and write | ||||
| Page 11 Display 5-6 | Read and write | ||||
| Page 11 Display 5 | Read and write | ||||
| Page 11 Display 6 | Read and write | ||||
| Page 12 Display 1 | Read and write | ||||
| Page 12 Display 2 | Read and write | ||||
| Page 12 Display 3 | Read and write | ||||
| Page 12 Display 4 | Read and write | ||||
| Page 12 Display 5-6 | Read and write | ||||
| Page 12 Display 5 | Read and write | ||||
| Page 12 Display 6 | Read and write |
Loading registers…
Send your device list
If a device is not in the library yet, we build the template for free as soon as we have the register data.
Use cases
- Show voltage, current and power per phase of a switchboard on a dashboard.
- Log imported and exported active energy to report consumption per month.
- Get an alert when voltage THD or the neutral current passes a limit you choose.
- Watch the averaged active power demand and its maximum against the contracted capacity.
- Check the status register for a phase sequence error or a spent clock battery.
Installation
Connect the RS485 terminals of the N43 to the RS485 port of the ModbusCloud Gateway, A to A and B to B, with a terminator at both ends of the bus.
On the meter, open the parameter settings and set the Modbus address, the baud rate and the transmission mode, or keep the factory setting of address 1, 9600 baud, 8N2.
In ModbusCloud, add a Modbus device with the same address, speed, parity and stop bits and import this template.
Check that the frequency reads about 50 Hz and that the phase voltages match the display of the meter.
Set the current and voltage transformer ratios in the meter so the values read primary amps and volts.
Things to watch for
The meter does not answer on the bus. What should I check?
The factory setting is 8N2, with two stop bits, which many masters do not use by default. Match address, baud rate, parity and stop bits in ModbusCloud, then swap A and B and check the terminator at both ends of the line.
A value suddenly reads 1e20. Is that a fault?
No. The N43 writes 1e20 when a value is outside the measuring range, for example a power factor at almost no load or THD with the frequency outside 48 to 52 Hz.
Why does the active energy counter drop back to zero?
The kWh register counts up to 99999.9 and then starts again, while the overflow register adds one for every 100 MWh. Add both to get the total, or read the energy from the 16-bit pairs at 4048 and up.
Can I change settings from ModbusCloud?
Yes, the transformer ratios, alarms, pulse output, communication, clock and display pages are writable. A new baud rate or address only takes effect after register 4042 is set to 1, and the device in ModbusCloud then needs the new settings too. Writing must be enabled for the gateway first.
Want to see how it works?
