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Summary of Contents for CCS WattNode WNA-1P-240-TP78
- Page 1 ® for L ® ORKS User’s Guide Continental Control Systems http://www.ccontrolsys.com Rev 1.22...
- Page 2 All products sold by Continental Control Systems, LLC (CCS) are guaranteed against defects in material and workmanship for a period of one year from date of shipment. CCS’s responsibility is limited to repair, replacement, or refund. CCS reserves the right to substitute equivalent new or used parts.
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Page 3: Table Of Contents
Contents 1 OVERVIEW......................5 1.1 WattNode............................. 5 1.2 Current Transformers .......................... 5 ® 1.3 LonTalk Network ..........................6 ® 1.3.1 LonMark ........................... 6 1.3.2 External Interface File (XIF) ...................... 6 2 HARDWARE INSTALLATION................7 2.1 Precautions ............................7 2.2 Measurement Configurations ......................7 2.2.1 Single-Phase Two-Wire ...................... - Page 4 5 TROUBLESHOOTING ..................31 5.1 Service LED............................31 5.2 Miscellaneous ............................32 5.2.1 Test CT Polarity ........................34 5.2.2 Test CT Ordering ........................34 5.2.3 Test CT Output..........................34 6 SPECIFICATIONS ....................35 6.1 Models..............................35 6.2 Current Transformers .........................35 6.3 Accuracy ............................36 6.4 Timekeeping ............................36 6.5 Update Rate............................36 6.6 Ratings ...............................36 6.6.1 Electrical ...........................36...
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Page 5: Overview
1 Overview 1.1 WattNode The WattNode is designed for use in demand side management (DSM), sub-metering, and energy monitoring applications where accuracy at reasonable cost is essential. It is also possible to use the WattNode to measure power generation. Models are available for single-phase, three-phase wye and three- phase delta configurations for voltages from 120 VAC to 600 VAC, 60 Hz. -
Page 6: Lontalk Network
CTs can measure lower currents than they were designed for by passing the wire through the CT more than once. For example, to measure currents up to 1 amp with a 5 amp CT, pass the wire through the CT once, then loop back around the outside of the CT, and pass the wire through the CT again. -
Page 7: Hardware Installation
VAC three-phase. These voltages are lethal! Always adhere to the following checklist: 1) CCS recommends that a licensed electrician install the WattNode. 2) The WattNode does not contain any user serviceable parts; return to CCS for service. 3) Verify that circuit voltages are within the proper range for the WattNode model. -
Page 8: Single-Phase Two-Wire
2.2.1 Single-Phase Two-Wire The single-phase two-wire 120 VAC configuration is most often seen in homes and offices. The two wires are neutral and line. The unused CT inputs must be shorted with an insulated jumper wire. Single-phase two-wire circuits can be measured with models WNA-1P-240 or WNA-3Y-208. WNA-1P-240-FT10 Service Shorting... -
Page 9: Single-Phase Three-Wire
2.2.2 Single-Phase Three-Wire This is seen in residential and commercial service with 240 VAC for large appliances. The three wires are neutral and two line voltage wires with AC waveforms 180° out of phase. The ground wire is not connected. This results in 120 VAC between either line wire and neutral, or 240 VAC between the two line wires. -
Page 10: Three-Phase Three-Wire Delta
2.2.3 Three-Phase Three-Wire Delta WARNING This configuration is dangerous because there is no neutral wire, and as a result, the screw terminals to connect the CTs will have line voltages on them whenever the WattNode is powered. Therefore, for safety, it is critical that the WattNode is not powered while connecting the CTs. This is typically seen in manufacturing and industrial environments. -
Page 11: Three-Phase Four-Wire Wye
Load Phase A Phase B Phase C Figure 2.4: Three-Phase Delta Currents 2.2.4 Three-Phase Four-Wire Wye This is typically seen in manufacturing and industrial environments. The wires are neutral and three power lines with AC waveforms shifted 120° between the successive phases. With this configuration, the line voltage wires may be connected to the phase A, B and C terminals in any order, so long as the CTs are connected to matching phases. -
Page 12: Three-Phase Four-Wire Delta
2.2.5 Three-Phase Four-Wire Delta CAUTION This configuration must be wired correctly. The voltage between neutral and the phase A line input must be only 120 VAC. Connect the 208 VAC “Wild Phase” to the phase C line input. This is typically seen in manufacturing and industrial environments. This configuration provides a 240 VAC three phase delta, two 120 VAC phases (to neutral), and a single 208 VAC phase—known as the “Wild Phase”. -
Page 13: Connecting Current Transformers
143.5 mm (5.65") Drawn to Scale Ø 9mm (11/32") 127 mm (5.0") Ø 5.5mm (7/32") 32.5 mm (1.28") High Figure 2.7: WattNode Dimensions To protect the WattNode’s plastic case, use washers if the mounting screws could pull through the mounting hole or damage the case. Also, take care not to overtighten the mounting screws, as long term stress on the case may cause cracking. -
Page 14: Connecting Voltage Terminals
WattNodes at the same site, it may be easier to provide separate circuit breaker(s) for the WattNodes. The detachable screw terminals may be installed or removed while power is applied. CCS recommends the use of insulated gloves whenever working with a live circuit. -
Page 15: Installation Summary
The WattNode may be purchased with the following transceivers: Transceiver Bit Rate Max. Nodes Max. Distance Max. Stub Length TPT/XF-78 78 Kbps 1400 m 3.0 m FTT-10 78 Kbps 500–2700 m 3.0 m Per subnet (see Echelon LonWorks Products Databook for more details) Only applies to bus topology networks. -
Page 16: Network Configuration
3 Network Configuration 3.1 Identifying the WattNode The WattNode supports three network identification methods. The first requires that the WattNode’s service button be pressed when requested by the network installation software. The second technique uses the WattNode’s unique Neuron ID to identify the WattNode being installed. The third uses the network wink command to light the WattNode’s service LED for 5 seconds. -
Page 17: Network Variables
3.3 Network Variables The WattNode uses LonMark interoperable SNVTs (Standard Network Variable Type) and object definitions. The WattNode is designed as three independent sensor objects and one supervisory node object. The three objects report energy, power and demand. They may be independently activated, configured, and bound on the network. -
Page 18: Network Variable Summary
3.3.2 Network Variable Summary Variable Name Variable Type Default Description Node Object (#0) nviRequest SNVT_obj_request 0, normal Object request (object_id,request) nvoStatus SNVT_obj_status Object status nviTimeSet SNVT_time_stamp Time of day (yr,mn,dy,hr,mn,sec) nvoAlarm SNVT_alarm WattNode alarms nciStsMaxSendT SNVT_elapsed_tm 0 sec. Status update interval (dy,hr,mn,sec,ms) Energy Measurement Object (#1) nvoElecWH_f SNVT_elec_whr_f... -
Page 19: Operation
4 Operation 4.1 Node Object Node Object #0 Node nviRequest nvoStatus SNVT_obj_request SNVT_obj_status Management Network nviTimeSet nvoAlarm SNVT_time_stamp SNVT_alarm Variables Configuration nciMaxStsSendT SNVT_elapsed_tm nc22 Variables Figure 4.1: Node Object The Node object in the WattNode provides status and request mechanisms, time of day, and alarms. The WattNode uses several floating point network variables. -
Page 20: Status
Request & Number Node Object #0 Energy Object #1 Power Object #2 Demand Object #3 NORMAL Enables all objects. No effect. Enables power object. Enables demand object. Bound variables will be Bound power variables Demand variable will propagated on the will be propagated. -
Page 21: Time Of Day
4.1.3 Time of Day The time of day variable nviTimeSet is an input that the WattNode uses to timestamp alarms, peak demand, energy clear time and peak demand clear time. It also keeps demand intervals synchronized. It is not necessary to bind this variable, but if it is not set, then alarms will be reported with time fields set to zero, and the demand measurements will be timed off the WattNode’s internal crystal. -
Page 22: Energy Measurement
The alarms are reported through the Node object, but they are configured by the Power and Demand objects. Full descriptions of the configuration and operation of the alarms are in sections 4.3.2 Power Alarms and 4.4.4 Demand Alarms . 4.2 Energy Measurement Energy Measurement Object #1 nvoElecWH_f... -
Page 23: Zeroing Energy
The integer output variable nvoElecKWH , rolls over to zero when its count reaches 50,000—at 50,000 kWH. This permits measurements across the roll over point. For example, in most home metering, only the three least significant digits are reported on the bill and if a measurement is smaller than the previous measurement, then it is assumed that a thousand kW boundary was crossed. -
Page 24: Power Measurement
4.3 Power Measurement Power Measurement Object #2 Power nvoPower_f SNVT_power_f Output nc22 nciWMaxSendT SNVT_elapsed_tm nc24 nciWMinSendT SNVT_elapsed_tm nc27 nciWMinDelta SNVT_power_f nciPowLimHi SNVT_power_f Configuration nc18 nciPowLimLo SNVT_power_f nciPowAlmSetT SNVT_elapsed_tm Properties nciPowAlmClearT SNVT_elapsed_tm nc11 nciPowLimHystHi SNVT_power_f nc13 nciPowLimHystLo SNVT_power_f nciPowAlarmInhT SNVT_elapsed_tm nvoPowerW Manufacturer SNVT_power Specific... -
Page 25: Power Alarms
There are three strategies for receiving power updates over the network. For the first, it is not necessary to bind the power network variables. Instead, the monitoring node uses polling to retrieve the current power value. The second technique uses nciWMaxSendT to set an interval at which the WattNode will update all nciWMinSendT... -
Page 26: Power Alarm Example
Alarm Levels Alarm Actions Hi + HystHi High power alarm SET Hi - HystHi High power alarm CLEARED Normal Operation - No alarms Lo + HystLo Low power alarm CLEARED Lo - HystLo Low power alarm SET Note: all alarm level variable names have the prefix 'nciPowLim' left off. -
Page 27: Demand Measurement
4.4 Demand Measurement Demand Measurement Object #3 Demand nvoDemand_f SNVT_power_f Outputs Configuration nciDemHiLim1 SNVT_power_f nc10 nciDemHiLim2 SNVT_power_f Properties nciDemPeriod SNVT_elapsed_tm nciDemSubints SNVT_count nvoDemandW SNVT_power nvoDemandKW SNVT_power_kilo Manufacturer nvoLoadControl SNVT_switch Specific Variables nvoPkDemandW SNVT_power nvoPkDemandKW SNVT_power_kilo nvoPkDemand_f SNVT_power_f nvoPeakDemT SNVT_time_stamp nvoPkDemResetT SNVT_time_stamp Figure 4.5: Demand Measurement Object Demand is defined as the average power over a specified time interval. -
Page 28: Demand Configuration
The WattNode also supports rolling demand (also called “sliding window”), in which the demand intervals are evenly divided into a fixed number of subintervals. At the end of each subinterval, the average power over the demand interval is computed and output. This results in better accuracy, especially for demand peaks which would not have lined up with the demand interval without subintervals. -
Page 29: Demand Output
4.4.2 Demand Output The demand power and the peak demand are each available in three different units: Demand Peak Demand Resolution Range Network Variables Network Variables nvoDemandW nvoPkDemandW 0.1 watt 0 to 6553.5 watts nvoDemandKW nvoPkDemandKW 0.1 kilowatt 0 to 6553.5 kilowatts nvoDemand_f nvoPkDemand_f 1.2e-7 ×... -
Page 30: Demand Alarms
Whenever a new demand peak occurs, the peak demand value and nvoPeakDemT are updated. nvoPeakDemT is a SNVT_time_stamp that records the time at which the peak demand occurred, as this can sometime affect billing, and may be useful in monitoring applications as well. When the peak demand is zeroed, the output value will be zero until the next demand interval or subinterval is completed. -
Page 31: Troubleshooting
5 Troubleshooting 5.1 Service LED The service LED indicates the operating condition of the WattNode firmware. Many problems can be diagnosed by observing the service LED. Figure 5.1 shows the different behaviors of the WattNode service LED after power up. During normal operation, after the initial power up, the LED should remain OFF. In addition, the service LED should always light while the service button is being pressed: this can be used to test that the WattNode is powered. -
Page 32: Miscellaneous
5.2 Miscellaneous SYMPTOM: The WattNode does not appear on the network. Probable Causes Corrective Actions The WattNode is not powered Check for power by pressing the service button and watching for the service LED to light. The WattNode is not connected to the Check the network wires to the WattNode. - Page 33 SYMPTOM: The WattNode appears to be reporting incorrect values. Probable Causes Corrective Actions nciGain value is set incorrectly. See section 4.2.3 Energy Configuration to check configuration. nciCTAmps nciCTAmps does not match the rating of Check that is set to the correct value. the CTs.
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Page 34: Test Ct Polarity
5.2.1 Test CT Polarity 1. Either remove power from the WattNode or unplug the CT screw terminals from the WattNode before working with the CT wires. 2. Check each CT in turn. Disconnect the other CTs and jumper their screw terminals with a shorting wire. -
Page 35: Specifications
6 Specifications 6.1 Models Model VAC phase to VAC phase to Phases Wires Neutral neutral phase Present WNA-1P-240-xxx 2 or 3 WNA-3Y-208-xxx 208,240 WNA-3Y-400-xxx WNA-3Y-480-xxx WNA-3Y-600-xxx WNA-3D-208-xxx WNA-3D-480-xxx WNA-4WD-240-xxx 120/208 Table 6.1: WattNode Models The transceiver suffixes (-xxx) are -TP78 or -FT10. 6.2 Current Transformers The WattNode uses CTs with integral burden resistors generating 0.333 VAC at rated current. -
Page 36: Accuracy
6.3 Accuracy The WattNode’s minimum accuracy is 0.45% of reading plus 0.05% of full-scale. The WattNode’s temperature dependence is less than ±0.01% / °C. The total system accuracy is subject to CT accuracy. The WattNode can measure power from 0.05% to 150% of rated power at reduced accuracy, which provides extra range for occasional high loads and for alarms. -
Page 37: References
7 References Handbook for Electricity Metering . 9th edition: Edison Electric Institute, 1992 Application Layer Interoperability Guidelines . Version 3.0: Echelon Corporation, 1996 ® Engineering Bulletin “L Custom Node Development” : Echelon Corporation, ORKS ORKS January 1995 ® Technology Device Data . -
Page 38: Index
Index object 17, 22 alarms 21 override 23 demand 30 status 20 levels 26 zeroing 16, 19, 22, 23 power 25 ESD 14 example 26 external interface file 6, 17, 33 hysteresis 25 inhibit time 26 FTT-10 15, 36 sources 26, 30 fuses 14 status 20 types 21... - Page 39 output 17 status 20 summary 18 subintervals demand measurement, Neuron ID 16 subintervals Node object 17, 19 nvi 17 three-phase four-wire 11, 12 nviRequest 19, 23, 29 three-phase three-wire 10 nviTimeSet 21, 29, 36 time of day 21, 29, 36 nvo 17 TPT-78 15, 36 nvoAlarm 21, 26, 30...
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