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WattNode WNC-3Y-208-MB, Инструкция по установке и эксплуатации

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 Installation 13

Three-Phase Four-Wire Wye

This is typically seen in commercial and industrial environments. The conductors are neutral and 
three power lines with AC waveforms shifted 120° between phases. The line voltage conductors 
may be connected to the 

Ø

A

, 

Ø

B

,

 

and 

Ø

C 

terminals in any order, 

so long as the CTs are con-

nected to matching phases

. It is important that you connect 

N

 (neutral) for accurate measure-

ments. For wye “

-3Y

” models, the meter is powered from the 

N

 and 

Ø

A

 terminals.

Figure 5: Three-Phase Four-Wire Wye Connection

Recommended WattNode Models

The following table shows the WattNode models that should be used, depending on the line-to-
neutral voltage and line-to-line voltage (also called phase-to-phase voltage).

Line-to-Neutral Voltage

Line-to-Line Voltage

WattNode Model

120 Vac

208 Vac

WNC-3Y-208-MB

230 Vac

400 Vac

WNC-3Y-400-MB

277 Vac

480 Vac

WNC-3Y-480-MB

347 Vac

600 Vac

WNC-3Y-600-MB

Note: you may also use the following delta WattNode models to measure three-phase four-wire 
wye circuits. The only difference is that delta WattNode models are powered from 

Ø

A

 and 

Ø

B

, 

rather than 

N

 and 

Ø

A

. If neutral is present, it must be connected for accurate measurements.

Line-to-Neutral Voltage

Line-to-Line Voltage

WattNode Model

120 - 140 Vac

208 - 240 Vac

WNC-3D-240-MB

230 Vac

400 Vac

WNC-3D-400-MB

277 Vac

480 Vac

WNC-3D-480-MB

Ground

W

HI

TE

B

L

AC

K

Ø

B  CT

Ø

C  CT

Ø

A  CT

Ø

B

Ø

C

N

Ø

A

Common

B+, D1, RxD+/TxD+

E

IA-

4

8

5

PC or Logger

A−, D0, RxD−/TxD−

Continental Control Systems LLC

Status

Status

Status

X

C

B+

A-

M

O

D

B

U

S

Com

WNC

-

WNC

-

W

ATT

N

ODE

®

 M

ODBUS

-

MB

-

MB

Neutral

Phase A

Phase B

Phase C

LO
A

D

WHITE

BLACK

W

HI

TE

B

L

AC

K

LI

N

E

Source

Faces

Current

Transformers

3Y

-

xxx

3D

-

xxx

Содержание WNC-3Y-208-MB

Страница 1: ...Modbus Installation and Operation Manual WNC 3Y 208 MB WNC 3Y 400 MB WNC 3Y 480 MB WNC 3Y 600 MB WNC 3D 240 MB WNC 3D 400 MB WNC 3D 480 MB http www ccontrolsys com Continental Control Systems LLC Rev...

Страница 2: ...eived including interference that may cause undesired operation The FCC limits are designed to provide reasonable protection against harmful interference in a residential installation This equipment g...

Страница 3: ...onnecting Current Transformers 17 Circuit Protection 18 Connecting Voltage Terminals 19 Setting the Modbus Address 19 Baud Rate 20 Connecting Modbus Outputs 20 Planning the Modbus Network 20 Installat...

Страница 4: ...Energy 42 Negative Energy 43 Reactive Energy 43 Apparent Energy 43 Power Factor 43 Reactive Power 44 Apparent Power 44 Current 45 Demand 45 IO Pin Options 47 Configuration Registers 47 Demand Configu...

Страница 5: ...itoring the phase A B and C values If necessary you can use different CTs on the different circuits Communication The WattNode meter uses a half duplex EIA RS 485 interface for communication The stand...

Страница 6: ...he X terminal Option SSR Provides a solid state relay contact closure output between the X and C terminals for load shedding and other applications Special Options Contact the factory about the follow...

Страница 7: ...meter accuracy C Neutral This terminal N should be connected to neutral when available D E F Line voltage inputs These terminals connect to the A phase A B phase B and C phase C electric mains On wye...

Страница 8: ...ply voltage for this model The V indicates AC voltage For wye models this voltage should appear between the N and A terminals For delta models this voltage should appear between the A and B terminals...

Страница 9: ...t ratings 5 Ensure that the line voltage inputs to the meter have either fuses or circuit breakers on each voltage phase not needed for the neutral wire See Circuit Protection pg 18 for details 6 Equi...

Страница 10: ...eutral 3 Phase 3 Wire Delta 208V no neutral 3 Phase 4 Wire Wye 120V 208V with neutral 3 Phase 4 Wire Delta 120 208 240V with neutral WNC 3D 400 MB Delta or Wye 230 Vac 400 Vac 3 Phase 3 Wire Delta 400...

Страница 11: ...Single Phase Three Wire Connection Recommended WattNode Models The following table shows the WattNode models that can be used If neutral may or may not be present you should use the WNC 3D 240 MB see...

Страница 12: ...del This configuration is normally measured with the following WattNode model Line to Line Voltage WattNode Model 208 240 Vac WNC 3D 240 MB If neutral is available you may also use the WNC 3Y 208 MB m...

Страница 13: ...ine to Neutral Voltage Line to Line Voltage WattNode Model 120 Vac 208 Vac WNC 3Y 208 MB 230 Vac 400 Vac WNC 3Y 400 MB 277 Vac 480 Vac WNC 3Y 480 MB 347 Vac 600 Vac WNC 3Y 600 MB Note you may also use...

Страница 14: ...Recommended WattNode Models The following table shows the WattNode models that should be used depending on the line to line voltage also called phase to phase voltage Line to Line Voltage WattNode Mod...

Страница 15: ...nd attaching a note to the meter indicating this configuration for future reference Mounting Protect the WattNode meter from moisture direct sunlight high temperatures and conductive pollution salt sp...

Страница 16: ...multimeters and the WattNode meter Resistive loads like heaters and incandescent lights have nearly sinusoidal current waveforms with a crest factor near 1 4 Power factor corrected loads like computer...

Страница 17: ...LEDs Be careful to match up the current transformers to the voltage phases being measured Make sure the A CT is measuring the line voltage connected to A and the same for phases B and C Use the suppli...

Страница 18: ...r this earth connection is not used for safety protective earthing For solid core CTs disconnect the line voltage conductor to install it through the CT opening Split core and bus bar CTs can be opene...

Страница 19: ...in the white box on the meter front label When power is first applied to the meter check that the LEDs behave normally see Installation LED Diagnostics pg 23 below if you see the LEDs flashing red gre...

Страница 20: ...4 to the ApplyComConfig 1651 register to apply the new address 2 Set the address with the Address register Set the DIP switches to any non zero address so the meter won t reset the address to the fact...

Страница 21: ...you may use stubs or branches Long stubs or branches greater than 30 m 100 ft may cause signal reflections and should be avoided Termination Networks shorter than 500 m 1650 ft should not need termina...

Страница 22: ...g communication problems If you are using shielded cable you may use the shield to provide the Modbus common C connection between all devices on the network Connect the cable shield or Modbus common i...

Страница 23: ...hase if line Vac is present but the measured power is below the minimum that the meter will measure see Creep Limit pg 58 the meter will display solid green for that phase Inactive Phase If the meter...

Страница 24: ...hift between voltage and current resulting in a low power factor and probably negative power Yellow red flashing negative power is less common and indicates incorrect installation unless you are gener...

Страница 25: ...inal operating voltages printed in the white rectangle on the front label Meter Error If the meter experiences an internal error it will light all LEDs red for three seconds Check the ErrorStatus 1710...

Страница 26: ...k the measured power for each active phase PowerA PowerB PowerC If possible estimate or measure the actual power Also make sure the load you are measuring is currently on If one or more active phases...

Страница 27: ...lled properly Check for CTs touching each other or pre existing CTs CT opening too large for the wire being measured The voltage phases green screw terminal block are not matched up with the current p...

Страница 28: ...he measured power factor or reactive power appears to be outside the normal ranges this most commonly indicates that the voltage and current phases on the meter are not connected properly although som...

Страница 29: ...e second for any of the following errors the ErrorStatus registers will also be set but depending on the problem you may not be able to read register values CRC error this could indicate noise on the...

Страница 30: ...rrorStatus 211 212 The Modbus packet contained an invalid count of registers or an invalid byte count 04 Slave device failure ErrorStatus 200 The correct ConfigPasscode must be entered before changing...

Страница 31: ...ive amps Set the CtAmps 1603 register to the correct rated CT amps of your current transformers For example if you are using 100 A CTs write 100 to register 1603 16 bit integer register Verify Operati...

Страница 32: ...odbus protocol is a master slave protocol with only one master and many slaves The WattNode meter is always a slave device and responds only when queried Modbus on EIA RS 485 allows for either full du...

Страница 33: ...600 MB WNC 3D 240 MB Continental Control Systems LLC WattNode MODBUS WNC 3D 240 MB WNC 3D 400 MB Continental Control Systems LLC WattNode MODBUS WNC 3D 400 MB WNC 3D 480 MB Continental Control Systems...

Страница 34: ...t values have a limitation the effective resolution in kWh gets lower as more energy accumulates If the total energy exceeds 100 000 kWh the resolution of the floating point energy will become coarser...

Страница 35: ...to line phase A to B 1029 1030 VoltBC V RMS voltage line to line phase B to C 1031 1032 VoltAC V RMS voltage line to line phase A to C Frequency Register 1033 1034 Freq Hz Power line frequency These r...

Страница 36: ...rectional energy phase A 1103 1104 EnerygB kWh Net bidirectional energy phase B 1105 1106 EnergyC kWh Net bidirectional energy phase C 1107 1108 EnergyPosA kWh Positive energy phase A 1109 1110 Energy...

Страница 37: ...ist Integer These registers provide advanced integer measurements The energy registers are 32 bit signed dual registers the first register provides the lower 16 bits and the second register provides t...

Страница 38: ...1356 DemandMax PowerIntScale Maximum power demand 1357 DemandApp PowerIntScale Apparent power demand 1358 DemandA PowerIntScale Real power demand phase A 1359 DemandB PowerIntScale Real power demand...

Страница 39: ...ni cation Registers pg 51 below for details Registers Name Default Description 1651 ApplyComConfig 0 Writing 1234 applies the configuration settings below Reads 1 if changes not applied yet 1652 Addre...

Страница 40: ...tCtAmpsB CtAmpsB Option CT phase B CtAmps 1726 OptCtAmpsC CtAmpsC Option CT phase C CtAmps 1727 OptModbusMode ModbusMode Option TCP RTU for Modbus protocol 1728 OptAddress Address Option AD Modbus add...

Страница 41: ...is value is appropriate for net metering applications i e photovol taic where you wish to measure the net energy in situations where you may sometimes consume energy and other times generate energy Us...

Страница 42: ...se registers as estimates of the line to line voltage In order to estimate these voltages the meter must know the phase offset or the type of electrical service see PhaseOffset configuration register...

Страница 43: ...egisters that can count up or down depending on the sign of the reactive power The WattNode meter only measures the fundamental reactive energy not including harmonics These values are reset to zero w...

Страница 44: ...PowerReacB PowerReacC or PowerReacSum to VARs use the following equation PowerReac VAR PowerReacSum PowerIntScale For example if PowerIntScale 1609 is 100 and the integer PowerReacSum 1343 reports 15...

Страница 45: ...to 720 minutes 12 hours The meter records the peak demand for metering applications where the measurements may only be accessed weekly or monthly Since the WattNode meter can measure bidirectional pow...

Страница 46: ...w ing equation Demand W Demand PowerIntScale For example if PowerIntScale 1609 is 100 and the integer Demand 1354 reports 4700 then the demand is 4700 100 470 000 watts or 470 kW Demand Subinterval De...

Страница 47: ...code contact support for assistance 0 Unlocked 1 Locked Invalid unlock attempts will result in the Modbus exception 03 Illegal data value and prevent more attempts for five seconds An unlocked meter w...

Страница 48: ...ications So if the status LED for a phase was flashing red and you flip the CT with CtDirections the LED will change to green flashing This cannot be used to correct for situations where CT phases do...

Страница 49: ...urrent values so that a current equal to the CT rated amps will result in an output value of CurrentIntScale The default CurrentIntScale is 20000 See CurrentA CurrentB CurrentC for more details Demand...

Страница 50: ...ower below MinimumPower is forced to zero FullScalePower is defined as the nominal line to neutral VAC see Specifications Models pg 56 multiplied by the full scale or rated CT current Generally the de...

Страница 51: ...u may want to use the broadcast address 0 so that all meters will update together This isn t permitted for setting the address because then multiple devices would share the same address The communicat...

Страница 52: ...col In order to make this work the meter can switch to the Modbus TCP IP protocol still using RS 485 which is nearly identical to Modbus RTU but with a different header and no CRC bytes TCP IP has a b...

Страница 53: ...or an RS 485 bus collision PacketErrorCount 1714 This counts up to 32767 the number of Modbus packets that could not be parsed OverrunCount 1715 This counts up to 32767 the number of times the Modbus...

Страница 54: ...nergySumNR register overflowed 100 gigawatt hours reset to 0 89 90 91 INFO EnergyReacA B C registers overflowed 100 gigawatt hours reset to 0 92 INFO EnergyReacSum register overflowed 100 gigawatt hou...

Страница 55: ...on the bus or packets longer than 256 bytes 251 WARNING RS 485 receiver error Generally caused by baud rate mismatch parity mode mismatch or electrical interference 252 253 WARNING Short Modbus packe...

Страница 56: ...psC This is used if non matching CTs are connected to different phases Communication Options Option EP Factory configure the Modbus RS 485 communications to even parity E81 Parity even Data bits 8 Sto...

Страница 57: ...on 1 Normal Operation Line voltage 20 to 15 of nominal Power factor 1 0 Frequency 48 62 Hz Ambient Temperature 25 C CT Current 5 100 of rated current Accuracy 0 5 of reading Condition 2 Low CT Current...

Страница 58: ...oltage for a phase drops below 20 of nominal Vac the output power for the phase will be set to zero These limits prevent spurious readings due to measurement noise To customize the creep limit see Cre...

Страница 59: ...13 Power Supply Characteristics Maximum Operating Power Supply Voltage Range 20 to 15 of nominal see table above For the WNC 3D 240 MB this is 20 of 208 Vac 166 Vac to 15 of 240 Vac 276 Vac Operating...

Страница 60: ...e an electrical enclosure Hammond Mfg Type EJ Series that is rated NEMA 3R or 4 IP 66 Mechanical Enclosure High impact ABS and or ABS PC plastic Flame Resistance Rating UL 94V 0 IEC FV 0 Size 143 mm 8...

Страница 61: ...as bus bar CTs because they are available in larger and custom sizes appropriate for use with bus bars or multiple large conductors These are UL recognized under UL file number E325972 CTB wwwXhhh xx...

Страница 62: ...ising under normal use and does not include malfunctions or failures resulting from misuse neglect improper application improper installation water damage acts of nature lightning product modification...

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