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Brand: Lumel
Lumel ND20 221100M1 Power Network Meter, RS-485
Description
The Lumel ND20 221100M1 is a panel-mounted network parameter meter that measures voltage, current, power, energy, frequency and harmonic distortion in single-phase and in balanced or unbalanced three-phase 3- or 4-wire systems. This code is the standard 85 to 253 V a.c. or 90 to 300 V d.c. supply version with one analog output and an RS-485 Modbus port.
Where the ND20 is used in a switchboard
A 96 x 96 mm instrument of this kind sits on the door of a motor control centre, a generator set panel, a capacitor bank cabinet or a sub-distribution board and gives the operator one place to read phase currents, voltages, kW, kvar and power factor. The data sheet shows the ND20 reading through current transformers and, if needed, voltage transformers, and passing the values to a master system by RS-485 Modbus. Because the display shows values already multiplied by the programmed transformer ratios (voltage ratio 0.1 to 4600.0, current ratio 1 to 10000), the panel reads in primary quantities and not in secondary amps.
Key features from the data sheet
- Measurement of network parameters in 2-, 3- or 4-wire balanced and unbalanced systems.
- High accuracy class: 0.2% of range on current, L-N voltage and frequency (0.2% of measured value).
- Voltage and current harmonics, selectable, plus THD factors for both.
- Backlit LCD 3.5 inch monochrome screen with configurable display pages.
- IP65 protection from the front side.
- One 0/4 to 20 mA analog output, a relay, a passive OC pulse output and RS-485 MODBUS RTU.
Technical specification
Measured quantities and ranges
| Quantity | Range and basic error |
|---|---|
| Current, 1 A input | Measuring range 0.002 to 1.200 A; indication 0.00 to 12 kA with ratio; error 0.2% of range |
| Current, 5 A input | Measuring range 0.010 to 6.000 A; indication 0.00 to 60 kA; error 0.2% of range |
| Voltage L-N | 57.7 V: 2.8 to 70.0 V; 69.3 V: 3.4 to 84 V; 230 V: 11.5 to 276 V; error 0.2% of range |
| Voltage L-L | 100 V: 5 to 120 V; 120 V: 6 to 144 V; 400 V: 20 to 480 V; error 0.5% of range |
| Frequency | 47.0 to 63.0 Hz; error 0.2% of measured value |
| Active / reactive / apparent power | Up to 1.65 kW, kvar or kVA at the measuring input; error 0.5% of range |
| Power factor PF, tan phi, cos phi | -1 to 1 (tan phi -1.2 to 1.2); error 1% of range |
| Phase angle | -180 to 180 degrees; error 0.5% of range |
| Active energy import / export; reactive inductive / capacitive | 0 to 99 999 999.9 kWh or kvarh; error 0.5% of range |
| THD of voltage and current | 0 to 100%; error 5% of range |
Outputs, interface and construction
| Parameter | Specification |
|---|---|
| Analog output | 1 programmable current output 0/4 to 20 mA |
| Relay output | Programmable, normally open voltage-free contacts, 250 V a.c. / 0.5 A a.c. |
| Pulse output | 1 passive OC type for active or reactive energy |
| Interface | RS-485, MODBUS RTU, modes 8N2, 8E1, 8O1, 8N1, 4.8 / 9.6 / 19.2 / 38.4 kbit/s |
| Display | 3.5 inch LCD, monochrome, backlit |
| Dimensions and cut-out | 96 x 96 x 77 mm; panel cut-out 92.5 +0.6 x 92.5 +0.6 mm |
| Weight | Below 0.3 kg |
| Protection (EN 60529) | IP65 from the front, IP20 from the terminal side |
| Supply, code 221100 | From 85 up to 253 V alternating or 90 up to 300 V direct (code 221200 takes the low-voltage supply instead) |
| Power consumption | 6 VA in the supply circuit; 0.05 VA in voltage and current circuits |
| Operating / storage temperature | -25 to 70 degrees C and -30 to 70 degrees C |
| Relative humidity | 25 to 95% without condensation, any mounting position |
| External magnetic field | 0 to 40 to 400 A/m |
| Overload for 1 s | Voltage input 2 Un (max 1000 V); current input 10 In |
| EMC | EN 61000-6-2 for immunity, EN 61000-6-4 for emissions |
| Safety (EN 61010-1) | Category III installations, pollution level 2, up to 300 V to earth on the supply and measuring circuits, site altitude under 2000 m |
Selection and ordering guide
Two main codes appear in the data sheet. ND20 221100M1 has current input 1 A / 5 A (X/1 A, X/5 A), voltage input 3 x 57.7/100 V, 3 x 69.3/120 V or 3 x 230/400 V, one 0/4 to 20 mA analog output, RS-485 and an 85 to 253 V a.c./d.c. supply, with bilingual Polish/English papers and a test certificate. ND20 221200M1 repeats the meter for a 20 to 40 V a.c./d.c. supply. Replacing the last character with the digit 2 (for example ND20 221100M2) adds a paid calibration certificate.
Installation and operation notes from the manual
The manual describes fixing the meter in a panel with four holders after cutting a 92.5 x 92.5 mm opening in a panel not thicker than 15 mm. Screw terminals take wires up to 2.5 mm2, and the manual asks for a switch or circuit breaker near the meter in the building installation. Connections cover direct, semi-indirect and indirect single-phase measurement and 3-wire and 4-wire three-phase measurement with three current transformers and two or three voltage transformers. Configuration is by the front keys or the free eCon software over RS-485.
Applications in GCC power and process plants
In Oman and the Gulf the ND20 fits switchboards for pump stations, desalination and water treatment, utility rooms, camps and commercial buildings. The rated ambient is -25 to 70 degrees C around the meter, so hot closed kiosks need engineering checks.
Frequently asked questions
What is the accuracy of the ND20?
The data sheet gives 0.2% of range for current, L-N voltage and frequency (0.2% of measured value), 0.5% for power and energy, and 1% for power factor.
Does the ND20 221100M1 have Modbus?
Yes, it has an RS-485 port with MODBUS RTU in 8N2, 8E1, 8O1 and 8N1 modes at 4.8 to 38.4 kbit/s.
What panel cut-out does the ND20 need?
A 92.5 x 92.5 mm cut-out (tolerance +0.6 mm); the meter measures 96 x 96 x 77 mm and the panel should be at most 15 mm thick.
What supply does code 221100M1 use?
85 to 253 V a.c. or 90 to 300 V d.c.; code 221200M1 uses 20 to 40 V a.c. or 20 to 60 V d.c.
Can the ND20 measure harmonics?
Yes, selected voltage and current harmonics, THD factors and a watt-hour meter for a chosen harmonic.
Documents and quotation
The Lumel ND20 user manual is attached to this page. It covers installation, wiring in 2-, 3- and 4-wire networks, menu parameters, the Modbus register map and the factory settings, and the data sheet code ND20-19G gives the ordering codes quoted here. Seven Star LLC is an independent supplier in Muscat and quotes the Lumel ND20 221100M1 on request; this page carries no price. Send the exact code and quantity, and we reply with availability and lead time. Confirm every rating and approval against the current Lumel documents before ordering. Related products: Electrical & Power.
Datasheets & Documents
- Manual ND20 power network meter user manual (Lumel) Download
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About brand
Lumel is a Polish manufacturer of industrial measuring and automation devices from Zielona Gora, known under this name since 1953. Its catalogue covers power network meters and analyzers, digital panel meters, controllers, recorders and data loggers, transducers, current transformers and shunts.
Lumel product families
The products on this site include panel and rail-mounted power network meters and analyzers with Modbus and Ethernet interfaces, power factor controllers, a DC circuit meter, a universal process panel meter, a PID temperature controller, a three-phase thyristor power controller and an Ethernet temperature and humidity monitor.
Where Lumel instruments are used
Typical uses are switchboards, generator and capacitor-bank panels, battery and rectifier circuits, industrial heating, plastics and food processing lines, and monitored storage and server rooms, wherever readings must reach a PLC, SCADA or building system.
Seven Star LLC is an independent supplier in Muscat and lists Lumel products on request, each page carrying the manufacturer's document and no price.
Related products
Frequently Asked Questions
What is the accuracy of the ND20?
The data sheet gives 0.2% of range for current, L-N voltage and frequency (0.2% of measured value), 0.5% for power and energy, and 1% for power factor.
Does the ND20 221100M1 have Modbus?
Yes, it has an RS-485 port with MODBUS RTU in 8N2, 8E1, 8O1 and 8N1 modes at 4.8 to 38.4 kbit/s.
What panel cut-out does the ND20 need?
A 92.5 x 92.5 mm cut-out (tolerance +0.6 mm); the meter measures 96 x 96 x 77 mm and the panel should be at most 15 mm thick.
What supply does code 221100M1 use?
85 to 253 V a.c. or 90 to 300 V d.c.; code 221200M1 uses 20 to 40 V a.c. or 20 to 60 V d.c.
Can the ND20 measure harmonics?
Yes, selected voltage and current harmonics, THD factors and a watt-hour meter for a chosen harmonic.
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