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1. 3 2 Current Sensor Type Selection CT Current sensor types are selected from a table of preferred types identified by their nominal primary current rating The following types may be selected 9 50 100 150 400 800 Note Current sensors MUST be from the PowerRail350V range of input devices supplied by the manufacturer Use of other sensors may affect accuracy 8 safety 3 3 Nominal Line Line Voltage Selection Un The nominal line line voltage of the measured supply system may be programmed For systems without potential transformers PTs this should be the same as the nominal input of the meter as specified on the rating label e g 400V For systems with PTs fitted this should match the nominal primary rating of the PT The preferred values are 11 40 48 100 110 208 400 480 600 800 1000 1100 2200 3300 4000 4400 9000 7500 10000 11000 15000 22000 25000 33000 40000 44000 55000 3 3 1 Fine Adjust Fine Adjust Mode allows values other than those provided by the default tables to be set To enter exit Fine Adjust Mode Hold ba and By together for 2 Seconds while setting Un Fine Adjust Mode is indicated by a decimal point after Un 3 4 Pulse Rate Selection Table Counts 1 2 5 10 100 1000 3 5 Pulse On Time Selection Table 100ms 200ms 500ms 15 2s 3s 5s 10s 20s Page 6 Rail350V Operating Manual Programming 3 6 Pulse Output Test This feature allows the pulse output hardware and
2. Mode is not available when Balanced Voltage Mode is selected as all Power Factors are assumed to be unity and current phase and direction is ignored asa SS Xai a a spp Page 8 Rail350V Operating Manual Programming 4 Display Scaling The units Wh kWh or MWh and the position of the decimal point for the energy power displays are automatically set dependant on the CT and Un settings for the meter The nominal 3 phase input for the meter is defined as Wnom V3 x Un x CT Where Un is the nominal Line Line voltage or PT primary 10V 55kV CT is the current sensor nominal primary 10A 25kA Un and CT are set in programming mode The display pages are scaled as follows The display pages are scaled as follows Amps CT SA Resolution 0 1 V 1v 0 001 kV gt 9 000 V 0 01 kV kW kvar kWh kvarh 0 01 kW kvar 0 1 kWh kvarh 0 01 MWh Mvarh Rail350V Operating Manual Page 9 Display Scaling TEE DA 5 Installation 5 1 Mounting On A Fail The PowerRail350V conforms to DIN 43880 6 Module Wide The unit is therefore compatible with a number of standard distribution systems with 45mm cut outs The meter should be mounted on a 35mm symmetrical Top Hat DIN rail of minimum length 106mm 5 2 Pulse Output Connection The pulse outputs take the form of isolated volt free normally open contact pairs The contacts are isolated from all other circuits 2 5kV 1 minute and at 50V from pulse1 to pulse 2
3. external system connections to be commissioned without a measured load The LCD shows Pto off and Ptr run and the number of test pulses The test pulse rate is set automatically dependant on the programmed pulse length maximum 0 5Hz Press ba to start stop the test pulses on both outputs Press La and i together to stop the test pulses and simultaneously reset the test counter 3 7 Voltage Input Mode Selection In Balance Voltage Mode the PowerRail350 may be connected to a single voltage source in place of the three phases normally reguired for full accuracy measurement When Balanced Voltage Mode is enabled the voltage measured on phase 1 is copied to phases 2 8 3 and all three power factors are assumed to be unity 1 00 In this mode the voltage connected to phase 1 on the meter may be fed from any of the 3 Phase system voltages This connection is valid for loads with a near unity power factor PF 0 95 equates to an error of 5 and balanced 3 Phase voltages The combination of Split Core Current Sensors and Balanced Voltage Mode allows for rapid commissioning where access cannot be made to 3 Phase terminations Ata later date when access Is possible for example during planned maintenance the meter may be connected safely to the 3 Phase voltages and Balanced Voltage Mode de selected Press ba or kd to toggle between Balanced Voltage Mode and True 3 Phase Measurement Mode True 3 Phase Measurement Mode Balanced Voltag
4. 13 Specification 7 Specification INPUTS System Voltage Un Current Sensors Output Nominal In Accuracy ND SCL8 5 ND SCL16 50 ND SCL16 100 ND SCT19 150 ND SCT32 400 ND SCT51 800 Enclosures Insulation Environment Measurement Range Freguency Range Voltage Burden Overload DISPLAY Type Data Retention Format Scaling Legends AUXILIARY SUPPLY Standard Options Load Overload 3 Phase 3 or 4 Wire Unbalanced Load 400 230V 3 Phase 3 or 4 Wire 110 63V 120 240V amp 208 120V optional Others to order 0 333Vac 1 0 11n 1 2In In 5A Max Cable 8mm Dia Phase Error lt 2 5 at 0 5In In 50A Max Cable 16mm Dia Phase Error lt 2 5 at 0 5In In 100A Max Cable 16mm Dia Phase Error lt 2 at 0 5In In 150A Max Cable 19mm Dia Phase Error lt 2 at 0 5In In 400A Max Cable 32mm Dia Phase Error lt 2 at 0 5In In 800A Max Cable 51mm Dia Phase Error lt 2 at 0 5In UL94V 0 gt 300Vrms CAT III Indoor use only Altitude lt 2000m Voltage 50 to 120 Current 0 2 to 120 Fundamental 45 to 65Hz Harmonics Up to 30th harmonic at 50Hz Individual to the 15th lt 0 1VA per phase Voltage x4 for 1 hour Current SCL x10 for 1min SCT19 200A Continuous SCT32 800A Continuous SCT51 2000A Continuous Custom Supertwist LCD with LED backlight 10 years min Stores kWh amp Meter set up 8 x 6 66mm high digits with DPs amp 3 2mm legends Direct reading User programmable CT amp VT C
5. LEDs Light emitting diodes LEDs on the front panel of the instrument remain ON during each associated output pulse Pulse Output Indicators Page 4 Rail350V Operating Manual Programming 3 Programming 3 1 Programming Menu To enter programming mode V Hold Ri and Bg together for 5 Seconds A Security Code may be required before changes to programmed parameters are allowed This is only required if a Security Code greater than zero is set via serial communications This is then stored in non volatile memory during power interruptions 4 Digit Security Code To Enter A Security Code Press Pj or E to change each digit Lowest significant digit first Press E to select next most significant digit When a valid code is input the programming menu is displayed To change a Programmable Value Press Ea or H until the required value is set To Move to The Next Setting Press Ei until the next page in the list is displayed Parameters are set in the following order Program Menu Pages Current Sensor Primary Nominal Line Line V or PT Primary Output Pulse Rate Pulse On Time Pulse Output Test Rail350V Operating Manual Page 5 Programming Hours Run Trip Point Percent Amps Voltage Input Mode CT Auto Rotation Mode Changes Are Stored to Non Volatile Memory After the last parameter is set the new values are stored and the meter continues to measure with the new settings
6. PowerRail350V Operating Manual Current Sensor Inputs August 2010 Safety l 1 Safety This instruction sheet gives details of safe installation and operation of the PowerRail350V electricity meter Safety may be impaired if the instructions are not followed Labels on each meter give details of equipment ratings for safe operation Take time to examine all labels before commencing installation Safety symbols on the meter have specific meanings Refer To User Manual Risk of Electric Shock WARNING The meter contains no user serviceable parts Installation and commissioning should only be carried out by qualified personnel WARNING Risk of Electric Shock Isolate all inputs and supplies to the meter before connecting the current sensors on the load cables or wiring the sensors to the meter Further information is available at http www ndmeter co uk eo EEE Page 2 Rail350V Operating Manual Operation 2 Operation 2 1 Energy Displays Press ie to select kWh kvarh and Hours Run display pages Active Energy Register Hours Run p Note 1 Reactive Energy Registe The Hours Run register accumulates the total time during which the average 3 phase load current exceeds a preset level This is always displayed with a resolution of 0 1hour The percentage level of 11 12 13 at which the Hours Run register accumulates is user programmable from 1 to 100 of full scale current Press k
7. T Primary programmable from 5A to 25kA VT primary programmable from 11V to 55kV Wh kWh MWh etc depending on user settings 230V 50 60 Hz 15 110V 50 60 Hz 15 OVA max x1 2 continuous METER ACCURACY All errors 1 digit kWh Kvarh kW 8 kVA kvar Amps amp Volts PF Neutral Current Better than Class 1 per EN 62053 21 amp BS 8431 Better than Class 2 per EN 62053 23 amp BS 8431 Better than Class 0 25 IEC 60688 Better than Class 0 5 IEC 60688 Class 0 1 IEC 60688 0 01In 1 2In or 0 1Un 1 2Un 0 2 0 05In 1 2In and 0 2Un 1 2Un Class 0 5 IEC 60688 0 05In 1 2In Page 14 Rail350 Operating Manual Specification OVERALL METERING ACCURACY ND SCL8 5 5 Amp Better than Class 2 Meter with Class 1 CTs ND SCL16 50 50 Amp Better than Class 1 Meter with Class 1 CTs ND SCT19 150 150 Amp Better than Class 1 Meter with Class 1 CTs PULSE OUTPUTS Function 1 Pulse per unit of energy Scaling Settable between 1 amp 1000 counts of kWh register Pulse Period 0 1 sec default Settable between 0 1 and 20 sec Rise amp Fall Time lt 2 0ms Type N O Volt free contact Optically isolated BIFET Contacts 100mA ac dc max 100V ac dc max Isolation 2 5kV 50Hz 1 minute MODBUS Serial Comms Bus Type RS485 2 wire Ov 2 Duplex 1 4 unit load Protocol MODBUS RTU with 16 bit CRC Baud Rate 4800 9600 or 19 200 User settable Address 1 247 User settable Latency Reply within 250ms max Command R
8. The pulses can be used as an input to a remote counter pulse logger building energy management system etc Pis2 Pis1 Pulse Output Connections E ee aaa ES Se ES ESS eS eee SSS Page 10 Rail350V Operating Manual Installation 5 3 Using Current Sensors WARNING Risk of Electric Shock Isolate all inputs and supplies to the meter before connecting the current sensors on the load cables or wiring the sensors to the meter 5 3 1 Current Sensor Polarity If measurement of positive and negative power is reguired True CT Rotation Mode the current sensors MUST be placed on the load cable with the correct polarity Refer to Section 3 8 for more information about setting the CT Rotation Mode The following diagram shows how each device is fitted on the cable for correct operation NOTE Ifa current sensor is placed on the cable in the opposite orientation the associated phase kW reading will be negative The secondary cables also reguire wiring with correct polarity The white cable or black white is the negative and should be connected to S2 or CT on the meter The black cable is the positive and should be connected to S1 or CT on the meter NOTES e The output from these current sensors is a low voltage It is safe to leave these outputs open circuit if not connected to a meter e The output connections from these current sensors must be individually wired direct to the meter and must not be earthed or connected to any
9. and H together and hold for 2 seconds to reset the hours run register Scaling of the energy registers is set by the nominal input currents and voltages and remains constant during operation of the meter Energy registers will each accumulate from zero to 99 999 999 then restart from zero 2 2 Voltage Displays V Press j to select from the following displays Phase n Voltages 1 3 Line Line Voltages 1 Note 1 2 3 Current Displays Press Ei to select from the following displays Phase 1 3 Current Rail350V Operating Manual Page 3 Operation 2 4 Power Displays Press bd to select from the following displays System Active Power Frequency Hz Phase 1 voltage System Power Factor C Capacitive Phase 1 3 Active Power Note 1 Phase 1 3 Power Factor C Capacitive NOTE 1 Some display pages are removed in Balanced Voltage Mode Refer to section 3 7 2 5 Pulse Outputs Two isolated pulse outputs are provided for connection to external systems such as Building Energy Management Systems BEMS data loggers remote counters etc Pulse 1 is associated with the active energy kWh register and Pulse 2 with the reactive energy kvarh register A single pulse occurs for each unit of energy on the display eg 1 pulse per 0 1kWh The pulse rate amount of energy associated with each pulse and pulse length may be set to suit the external system 2 5 1 Pulse
10. ate New command within 5ms of previous one GENERAL Temperature Operating 10 C to 65 C Storage 25 C to 70 C Humidity lt 75 non condensing Environment IP54 standard IP65 optional MECHANICAL Terminals Rising Cage 4mm2 12 AWG cable max Enclosure DIN 43880 6 Modules Wide Material Noryl with fire protection to UL94 V O Self extinguishing Dimensions 106 x 90 x 58mm Cut out 106 x 45mm Weight 250 gms SAFETY Conforms to EN 61010 1 Installation Category Ill 8 BS 8431 E amp O E Northern Design Electronics Ltd March 2008 Rail350V Operating Manual Page 15
11. e Mode In Balance Voltage Mode some display menu pages are removed as they have little or no meaning and voltage is displayed as Voltage Display in Balanced Voltage Mode Single Phase kW Power Factor and kvarh displays are removed while Balanced Voltage Mode is enabled Rail350V Operating Manual Page 7 Programming SSS SSS SS ey 3 8 CT Auto Rotation Mode When CT Auto Rotation Mode is selected the orientation of each Current Transformer CT on its respective cable becomes irrelevant It is therefore possible to pass the cable through the centre of the CT in either direction In this mode current direction is ignored and all power is assumed to be feeding a load import When CT Auto Rotation Mode is de selected True Rotation Mode current direction is monitored and measurement of import and export power is provided In both modes it is essential to place each CT on the correct phase conductor associated with the relevant phase voltage Therefore link CT1 with V1 CT2 with V2 CT3 with V3 PowerRail350 meters are normally supplied with CT Auto Rotation Mode selected In order to detect Positive and Negative power values in all four quadrants it is necessary to de select CT Auto Rotation Mode In the programming Menu Press ba or kl to toggle between CT Auto Rotation Mode and True Rotation Mode CT Auto Rotation Mode True Rotation Mode NOTE CT Auto Rotation
12. other circuit e lf the sensor secondary cables require extending care must be taken to avoid pickup of electrical interference With suitable low capacitance screened cables the cable can be extended to 100m or more e Examples of suitable cables include Belden 9841 Alpha 6412 and equivalents also multi pair versions of these cables This cable must have an insulation rating gt 250V e Current sensor polarity is irrelevant in Auto CT Rotation Mode refer to Section 3 8 Rail350V Operating Manual Page 11 Standard Connections 6 Standard Connections Vn P1 P2 L3 Oo P1 P2 L2 I O S1 S2 N 20090 gt C S1 2 L N Vn V1 V2 V3 11 I1 12 I2 13 I3 3 Phase 3 or 4 Wire Optional Neutral _ N gt k O al P1 P2 pa ull 1 gt Y S1 2 8 Vn V1 1 1 Single Phase Page 12 Rail350V Operating Manual Installation Vn E O al L2 O A i L1 S1 S2 alL sE L N Vn V1 V2 V3 M O M 12 12 13 13 Balance Voltage Mode NOTE In Balanced Voltage Mode L1 L2 or L3 may be used as the voltage input to V1 as phase is assumed to be zero in all measurements Balanced Voltage Mode must be selected in the programming Menu Refer to Section 3 7 in order to obtain meaningful measurements WARNING Ensure the supply connected to L N Aux Supply and Vn V1 Voltage Input is rated in accordance with the individual meter rating labels Rail350V Operating Manual Page

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