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CCS’s WattNode Revenue Modbus RWND-M1-MB Electric Power Meter is perfect for an array of applications. The kilowatt hour (kWh) energy and power meter is constructed with ANSI C12.1 and ANSI C12.20 class 0.5 accuracy. Users can execute bidirectional energy and power readings via an RS-485 port using Modbus RTU communications, as the meter is able to measure 1, 2, or 3 phases, in delta or wye services, from 120 to 600 Vac. It’s compact for easy handling and enclosed in a DIN-rail mount. Current transformers are available in an array of opening sizes with ratings from 5 to 6,000 amps. The Module is instrument powered from 6-24 Vdc or from an isolated 12-24 Vac control transformer. The optional MDR-10-12 DIN Rail Power Supply can power up to 12 WND-M1-MB meters.
*Please specify a revenue-grade CT model when ordering.
· Note: the CT amps are not locked on either model unless you order Option L.
Accuracy
The following accuracy specifications do not include errors caused by the current transformer accuracy or phase angle errors. “Rated current” is the current that generates a CT output voltage of 0.33333 Vac or equivalent milliamp output.
Unless otherwise noted, all accuracy specifications assume the following conditions:
- • Line voltage: 100 to 690 Vac
- •Power factor (PF): 0
- •Frequency: 48 – 62 Hz
- •Ambient Temperature: 23°C ± 5°C
- •CT Current: 1% – 100% of rated current
| Parameter | Test Conditions | Typ Max | Unit |
|---|---|---|---|
| EnergySum, Energy1, 2, 3(1) (active energy) | elapsed time(2) >= 10 s | ±0.2 ±0.5 | % |
| PowerSum, Power1, 2, 3 (active power) | averaging >= 1 s | ±0.3 ±0.5 | % |
| VoltA, B, C, VoltAB, BC, CA (RMS voltage) | averaging >= 1 s | ±0.3 ±0.5 | % |
| Current1, 2, 3 (RMS current) | averaging >= 1 s | ±0.2 ±0.5 | % |
| Freq (frequency) | averaging >= 1 s | ±0.05 ±0.2 | % |
| PowerFactor1, 2, 3 | averaging >= 1 s, PF > 0.5 | ±0.5 ±1.0 | % |
| EnergyReacSum, EnergyReac1, 2, 3 (reactive energy) | elapsed time(2) >= 10 s, PF < 0.9 | ±0.6 ±1.5 | % |
| PowerReacSum, PowerReac1, 2, 3 (reactive power) | averaging >= 1 s, PF < 0.9 | ±0.6 ±2.0 | % |
| EnergyAppSum, EnergyApp1, 2, 3 (apparent energy) | elapsed time(2) >= 10 s | ±0.3 ±0.5 | % |
| PowerAppSum, PowerApp1, 2, 3 (apparent power) | averaging >= 1 s | ±0.3 ±0.5 | % |
(1) Note: when parameters are written like Energy1, 2, 3, this means Energy1, Energy2, and Energy3.
(2)Note: This indicates that energy accuracy should be evaluated over a period of 10 seconds or longer.
Revenue Models
- •Meet the ANSI C12.1-2008 standard for revenue metering when used with class 0.6 or better current transformers.
- •Meet the ANSI C12.20-2010 standard for revenue metering when used with class 0.3 or better current transformers.
Measurement
- •Update Rate: 0.1 second. Internally, all measurements are performed at this rate, except the energy registers, which are updated every 1.0 second.
- •Start-Up Time: Energy measurement starts ~100 milliseconds after the supply voltage is applied. Modbus communication is enabled ~300 milliseconds after the supply is applied; at this time, all the registers will report valid data, such as power, voltage, current, etc.
- •Default CT Phase Angle Correction: 0.0 degrees.
Electrical
Power Supply
- •Nominal Power Supply Voltage: 6 to 24 Vdc or isolated 12 to 24 Vac source
- •Power Supply Minimum Operating Voltage: 6 Vdc or 10 Vac
- •Power Supply Absolute Maximum Voltage: 40 Vdc or 30 Vac
- •Power Supply Watts: typical 0.6 W, maximum 1.0 W
- •Power Supply Current (milliamps):
| DC Supply Volts | Typical (mA) | Maximum (mA) |
|---|---|---|
| 6 | 90 | 130 |
| 12 | 50 | 70 |
| 18 | 35 | 50 |
| 24 | 30 | 45 |
| 30 | 27 | 40 |
General Electrical
- •Line Frequency: 45 to 65 Hz
- •Nominal Line-to-Neutral Vac: 90 to 347 Vac
- •Nominal Line-to-Line Vac: 120 to 600 Vac
- •Measurement Over-Voltage Limit: 720 Vac
- •Over-Current Limit: 200% of rated current. Exceeding 200% of rated current will not harm the meter, but the current and power will not be measured accurately.
- •Maximum Surge: EN 61000-4-5: 2kV, ANSI C12.1 combination wave: 6kV, 1.2/50 μs – 8/20 μs
- •Line Voltage Power Consumption: The line voltage sensing circuitry draws 0.006 watts per phase at 120 Vac, increasing to 0.150 watts per phase at 600 Vac.
- •Real Power (50-60 Hz): <= 0.2 watts
- •Power Factor: ~1.0
- •Rated VA: 25 VA at 720 Vac, 50 Hz. The Rated VA is the maximum at 115% of nominal Vac at 50 Hz.
- •Measurement Category: The line voltage measurement terminals on the meter are rated for CAT III, 600 Vac. Measurement Category III is for measurements performed in the building installation. Examples are measurements on distribution boards, bus-bars, branch circuits, plug loads, and permanently connected equipment such as motors, boilers and heaters.
Current Transformer Inputs:
- •Voltage Mode:
- •Nominal Input Voltage (At CT Rated Current): 0.33333 Vac RMS
- •Absolute Maximum Input Voltage: 5.0 Vac RMS
- •Input Impedance at 50-60 Hz: 23 kΩ
- •Current Mode:
- •Nominal Input Current (At CT Rated Current): 40 mA RMS
- •Absolute Maximum Input Current: 200 mA RMS
- •Input Impedance at 50-60 Hz: 10 Ω
EIA RS-485 Interface
- •RS-485 Output Isolation: 4500 Vac RMS
- •Driver Output:
- •Voltage (Open Circuit): ±6 Vdc maximum
- •Voltage (54 Ω load): ±1.5 Vdc minimum
- •Current (54 Ω load): ±60 mA typical
- •Rise Time (54 Ω || 50 pF load): 900 nS typical
- •Receiver:
- •Common-Mode Range: -7 Vdc to +12 Vdc max
- •Sensitivity: ±200 mV
- •Bus Load: 1/8 unit load (up to 64 meters)
- •Failsafe Modes: bus open, shorted, and idle
Regulatory
- •UL: UL Listed 2808
- •UL / IEC 61010-1, 3rd Edition
- •CAN/CSA-C22.2 No. 61010-1-12, 3rd Edition
- •FCC: Class B, FCC Part 15, radiated and conducted emissions
- •CE: EN 61326-1: 2013, industrial locations
- •Radiated Emissions: CISPR / EN 55011, Class B
- •Conducted Emissions: CISPR / EN 55011, Class B
- •Electrostatic Discharge: EN/IEC 61000-4-2: (B) Self-Recovering
- •Radiated RF Immunity: EN/IEC 61000-4-3: (A) No Degradation
- •Electrical Fast Transient / Burst: EN/IEC 61000-4-4: (A) No Degradation
- •Surge Immunity: EN/IEC 61000-4-5: (A) No Degradation
- •Conducted RF Immunity: EN/IEC 61000-4-6: (A) No Degradation
- •Power Frequency H-field Immunity: EN/IEC 61000-4-8: (A) No Degradation
- •Voltage Dips, Interrupts: EN/IEC 61000-4-11: (B) Self-Recovering
- •RoHS Compliant
Environmental
- •Operating Temperature: –40°F to +176°F (–40°C to +80°C)
- •Operating Humidity: non-condensing, 5 to 90% relative humidity (RH) up to 104°F (40°C), decreasing linearly to 50% RH at 131°F (55°C)
- •Operating Altitude: Up to 9842 ft (3000 m)
- •Pollution: POLLUTION DEGREE 2 – Normally only non-conductive pollution; occasionally, a temporary conductivity caused by condensation must be expected
- •Indoor Use: Suitable for indoor use
- •Outdoor Use: Suitable for outdoor use if mounted inside an electrical enclosure (Hammond Mfg., Type EJ Series) rated NEMA 3R or 4 (IP 66)
Mechanical
- •Enclosure: High impact, ABS/PC plastic
- •Flame Resistance Rating: UL 94V-0, IEC FV-0
- •Size: 19 in. × 3.68 in. × 1.15 in. (106.4 mm × 93.4 mm × 29.1 mm)
- •Connectors: Euroblock pluggable terminal blocks
- •Green: up to 12 AWG (2.5 mm2), 600 V
- •Black: up to 12 AWG (2.5 mm2), 300 V
- •Screw torque 3.5 lbf·in (4.08 kgf·cm)
- •Weight: 4.7 oz (134 gm)
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