WattNode BACnet Reference Manual Download

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Contents

WattNode BACnet
Models ........................................................................................................................................... 1
WattNode Revenue Models for BACnet ........................................................................................ 1

Overview ................................................................................................................................5

Installation ..............................................................................................................................8

Precautions ..................................................................................................................................... 8
Electrical Service Types .................................................................................................................... 9

Baud Rate ............................................................................................................................... 20

Connecting BACnet MS/TP Outputs .............................................................................................. 20

Planning the BACnet Network ................................................................................................. 20
Wiring ..................................................................................................................................... 21

Operating Instructions .........................................................................................................29

Quick Start .................................................................................................................................... 29

WattNode Basic Configuration ................................................................................................. 29
Verify Operation ....................................................................................................................... 29
Measurement Overview ........................................................................................................... 29

BACnet Communication ................................................................................................................ 30
BACnet Self-Discovery ................................................................................................................... 30
BACnet Object and Property Lists .................................................................................................. 30

Summary of Contents for BACnet

Page 1: ...400 BN WNC 3Y 480 BN WNC 3Y 600 BN WNC 3D 240 BN WNC 3D 400 BN WNC 3D 480 BN WattNode Revenue Models for BACnet RWNC 3Y 208 BN RWNC 3Y 400 BN RWNC 3Y 480 BN RWNC 3Y 600 BN RWNC 3D 240 BN RWNC 3D 400...

Page 2: ...tection against harmful interference in a residential installation This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instruction...

Page 3: ...16 Connecting Current Transformers 17 Circuit Protection 18 Connecting Voltage Terminals 19 Connecting an External Thermistor 19 Setting the BACnet Address 20 Baud Rate 20 Connecting BACnet MS TP Outp...

Page 4: ...Object 42 Configuration and Diagnostic Objects 43 Demand Configuration 44 Thermistor Configuration 45 Calibration Adjustment 45 Zeroing Objects 46 ErrorStatus Objects 47 Communication Errors 49 Mainte...

Page 5: ...Phase C Sum Reactive Energy VAR hours Sum AC Frequency RMS Voltage Phase A Phase B Phase C RMS Current Phase A Phase B Phase C Demand and Peak Demand One WattNode BACnet meter can measure up to three...

Page 6: ...www bacnet org BACnet Standard ASHRAE ANSI Standard 135 2010 Front Label This section describes the connections information and symbols on the front label Continental Control Systems LLC Watthour Mete...

Page 7: ...erted into the corresponding screw terminal The terminals marked with black circles are connected together internally P Auxiliary output terminal This screw terminal is used for the X terminal options...

Page 8: ......

Page 9: ...lta 120 208 240V with neutral 96 138 166 276 3D 240 A and B 3 Phase 4 Wire Wye 230V 400V with neutral non N A 184 264 320 460 3Y 400 N and A 3D 400 A and B 3 Phase 4 Wire Wye 277V 480V with neutral 22...

Page 10: ...Wire Connection Recommended WattNode Models The following table shows the WattNode models that should be used depending on the line to neutral voltage Line to Neutral Voltage WattNode Model 120 Vac W...

Page 11: ...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 BN see Single Phase Two Wire without Neutral below If phase B may not...

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

Page 13: ...er is powered from the N and A terminals Line to Neutral Voltage Line to Line Voltage WattNode Model 120 Vac 208 Vac WNC 3Y 208 BN 230 Vac 400 Vac WNC 3Y 400 BN 277 Vac 480 Vac WNC 3Y 480 BN 347 Vac 6...

Page 14: ...models that should be used depending on the line to line voltage also called phase to phase voltage Line to Line Voltage WattNode Model 208 240 Vac WNC 3D 240 BN 400 Vac WNC 3D 400 BN 480 Vac WNC 3D...

Page 15: ...uctive pollution may be present use an IP 66 or NEMA 4 rated enclosure to protect the meter Due to its exposed screw terminals the meter must be installed in an electrical service panel or an enclosur...

Page 16: ...of the peak current to the RMS current the RMS current is the value reported by multimeters and the WattNode meter Resistive loads like heaters and incandescent lights have nearly sinusoidal current w...

Page 17: ......

Page 18: ...600 volts Solid wire may be used but must be routed carefully to avoid putting excessive stress on the screw terminal The WattNode meter has an earth connection which should be connected for maximum...

Page 19: ...on the meter front label Front Label p 6 After testing plug in the terminal block making sure that is pushed in all the way The WattNode meter is powered from the voltage inputs A phase A to N neutral...

Page 20: ...rest are 0 down the resulting BACnet address is 4 16 20 Baud Rate Select the baud rate by setting DIP switch positions 7 and 8 as shown below If power is applied when you start changing DIP switches...

Page 21: ...00 m 1650 ft should not need termination Longer networks and net works in electrically noisy environments may need termination at both ends of the bus with 120 ohm resistors between the A and B termin...

Page 22: ...the six position black terminal block on the meter matching the wire colors to the white and black dots on the front label Connect the voltage wires including ground and neutral if present to the gree...

Page 23: ...meter Alterna tively you can use the configuration objects InvertCtA InvertCtB and InvertCtC to reverse the polarity of one or more of the CTs The CT lead wires are connected to the wrong inputs For e...

Page 24: ...rmine the exact error If this happens repeatedly return the meter for service If a severe error occurs twice in 24 hours the LEDs will stay red for 24 hours Bad Calibration This indicates that the met...

Page 25: ...Next check 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 Low Line Voltage The...

Page 26: ...ormers may have a rated current too high or too low for your applica tion CTs should be used between 1 and 100 of their rated current for best results They generally work with reduced accuracy as low...

Page 27: ...er factor near 1 0 small negative reactive power Florescent lighting power factor between 0 4 and 1 0 Electrical heating power factor near 1 0 Office equipment power factor between 0 6 and 1 0 reactiv...

Page 28: ...ce making the request or another device The meter starts transmitting a response but doesn t see the data it is transmitting on the RS 485 bus This can happen if two devices have the same address and...

Page 29: ...ues are preserved across power failures Instantaneous measurements These are non accumulating values like power volts cur rent etc These are not preserved across power failures Demand measurements the...

Page 30: ...ntifiers and values of all properties or all optional properties Multi state Values for each multi state value object the WattNode meter implements the optional State_Text property which is an array o...

Page 31: ...eports DEVICE 8 for all analog input objects System_Status 112 This will return a value of OPERATIONAL 0 Vendor_Name 121 This will return Continental Control Systems LLC Vendor_Identifier 120 This wil...

Page 32: ...e and Object_Number Object_Name 77 A string name for this object such as EnergySum Object_Type 79 Reports ANALOG_INPUT 0 for all analog input objects Units 117 The BACnet engineering units for this me...

Page 33: ...ergy phase B 49 EnergyNegC kWh Negative energy phase C Reactive and Apparent Energy Objects 50 EnergyReacSum kVARh Reactive energy sum of active phases 51 EnergyReacA kVARh Net reactive energy phase A...

Page 34: ...objects are preserved across power failures These objects support resetting or presetting the value Analog Value Objects Configuration and Diagnostics The WattNode meter uses analog value objects for...

Page 35: ...eter Current Transformer Rated Amps 12 CtAmpsA 1 A 5 A CT rated current 0 to 60000 13 CtAmpsB 1 A 5 B CT rated current 0 to 60000 14 CtAmpsC 1 A 5 C CT rated current 0 to 60000 Demand Configuration Ob...

Page 36: ...me properties as the analog value objects but without a Units property and the following changes Present_Value 85 This reports or sets the value as an integer representing the state Object_Type 79 Thi...

Page 37: ...lue directly to each object All energy objects ending with NR for non resetting cannot be reset to zero for billing security You can protect all energy objects from being zeroed or preset by setting a...

Page 38: ...ergy EnergyNegSum will report 1000 not 1000 The negative energy objects are reset to zero except for EnergySumNegNR when ACTIVE 1 is written to the ZeroEnergy object You may also reset them to zero or...

Page 39: ...tive reactive power while capacitive loads generate negative reactive power Reactive power transfers no net energy to the load and generally is not metered by the utility Loads with high reactive powe...

Page 40: ...he same line frequency otherwise this value will be erratic or incorrect Current The WattNode BACnet meter estimates the RMS current for each phase This is an indirect measurement and does not include...

Page 41: ...and Measurement I Demand I Interval WattNode meters also supports rolling demand also called sliding window in which the demand intervals are evenly divided into a fixed number of subintervals At the...

Page 42: ...negative for systems with power generation It is preserved across power failures and can be reset with the ZeroDemand object Note there are no minimum or maximum demand objects for DemandA DemandB and...

Page 43: ...unlock attempts will result in the property error value out of range 37 and prevent more attempts for five seconds The passcode can be set or changed by writing the new passcode to ConfigPasscode twic...

Page 44: ...werReacB PowerReacC PowerAppSum PowerAppA PowerAppB PowerAppC CurrentA CurrentB CurrentC Averaging is beneficial because it reduces measurement noise and if the meter is being polled less often than o...

Page 45: ...PhaseAdjustA B and C to 600 which subtracts 600 millidegree or 0 6 degree from the phase lead Use negative values to compensate for a phase lead in the CT most common The default adjustment is 0 Creep...

Page 46: ...d object can be written with three values or 1 which does nothing If a ConfigPasscode has been set then you must unlock the meter before you can zero demand 2 Reset Min Max Zero DemandMin and DemandMa...

Page 47: ...d status code values For any codes not listed or those marked ERROR contact technical support All the notifications can be cleared by writing ACTIVE 1 to the ClearErrors object binary value For all th...

Page 48: ...gs 2000 2999 2000 2005 Line Vac reached or exceeded the overvoltage limit 2006 An attempt was made to write a non writable property 2008 An unexpected software reset occurred 2009 BACnet receive frame...

Page 49: ...Collisions due to more than one device configured with the same MAC address Not all devices configured with the same baud rate BACnet protocol violations bad timing invalid MS TP frame etc The WattNo...

Page 50: ...e token Maintenance and Repair The WattNode BACnet meter requires no maintenance There are no user serviceable or replace able parts except the pluggable screw terminals The WattNode meter should not...

Page 51: ...ue of the attached current transformers Option CT xxx yyy zzz Pre assign xxx to CtAmpsA yyy to CtAmpsB and zzz to CtAmpsC This is used if non matching CTs are connected to different phases Option TM1...

Page 52: ...ds after AC power is applied and enables the BACnet MS TP interface one second later Default Current Transformer Phase Angle Correction 0 0 degrees The CT phase angle correc tion can be changed using...

Page 53: ...t also includes the characteristics of an application specific controller B ASC List all BACnet Interoperability Building Blocks BIBBs Supported Annex K DS RP B Data Sharing ReadProperty B DS RPM B Da...

Page 54: ...mit is limited to 100 to 10000 The Present_Value of PtRatio is limited to 0 05 to 300 Binary Value Writeable Properties The Present_Value property of the objects InvertCtA InvertCtB Invert CtC ClearEr...

Page 55: ...m at 115 of nominal Vac at 50 Hz This is the same as the value that appears on the front label of the meter Maximum Power Supply Voltage Range 20 to 15 of nominal see table above For the WNC 3D 240 BN...

Page 56: ...er 58 tempera ture analog input object to report the measured temperature in degrees Celsius Thermistor Configuration Objects Added ThermistorCoeffA ThermistorCoeffB and ThermistorCoeffC analog value...

Page 57: ...functionally equivalent new or serviceable used parts This warranty covers only defects arising under normal use and does not include malfunctions or failures resulting from misuse neglect improper a...

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