Power Rail 303 - ND Metering Solutions
Contents
1. 3 Phase 3 Wire To Load To Load PowerRail303 Page 11 Commissioning L3 L2 L1 3 4 Vn V1 V2 V3 l1 M1 12 HV Systems Using PTs Vn P1 P2 1 R 51 2 N To Load To Load I2 3 I Hb GG Da qa L N Vn V1 V2 V3 1 1 2 Single Phase PowerRail303 Page 12 Commissioning 5 2 Pulse Output Connection The pulse output takes the form of an isolated volt free normally open contact pair The contacts are isolated from all other circuits 2 5kV 1 minute The pulse can be used as an input to a remote counter pulse logger building energy management system etc BEMS Pulse Input rL Pulse Output 5 3 Rail Mounting The PowerRail 303 enclosure conforms to DIN 43880 6 Modules wide The unit is therefore compatible with a number of standard DIN distribution systems with 45mm cut outs The Power Rail 303 should be mounted on a 35mm symmetric DIN rail of minimum length 106mm PowerRail303 Page 13 Specification 6 Specification Aux Mains Input Voltage Input Currents Accuracy LCD Display Pulse Output Environment Other PowerRail303 Nominal 230Vac 15 45 65Hz 1W max Optional 115Vac 15 Un 400V Line Line Range 20 120 Un Burden 0 1VA Phase Overload 2xUn Continuous Other nominal voltages are available to order Nominal Ib 5A Range 0 2 120 Ib Burden 0 1VA Phase Overload 20xIb 1 sec Isolation 2 5kV 1 minute Option2. support PowerRail303 Page 5 Operation Press ml kW Demand Period in Minutes The kW demand period in minutes is only displayed on meters supplied with this factory fitted option Press tl Serial Communication Baud Rate The baud rate is only displayed on meters supplied with the Modbus serial communication factory fitted option Press Pi Modbus Address The Modbus address is only displayed on meters supplied with the Modbus serial communication factory fitted option 2 7 Pulse Output An isolated pulse output is provided for connection to external systems such as Building Energy Management Systems BEMS data loggers remote counters etc 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 7 1 Pulse LED A green LED on the front panel of the instrument pulses ON during each output pulse DD Pulse Output Indicator PowerRail303 Page 6 Programming 3 Programming 3 1 Programming Menu To enter programming mode Hold we and PE together for 5 Seconds The first programmable parameter CT Primary is displayed 3 1 1 CT Primary Programming This should be set to match the nominal primary current rating in Amps of the external current transformers CTs fitted to the meter The CT secondaries must match the nominal input rating of the met
3. Rail 303 Operating Guide October 2007 Copyright Northern Design Bradford UK 2007 Safety 1 Safety This instruction manual gives details of safe installation and operation of the PowerRail 303 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 Further information is available at http www ndmeter co uk PowerRail303 Page 2 Operation 2 Operation 2 1 Energy Displays 2 2 Total kWh Register This default display presented on power up shows total kWh on an 8 digit accumulating register Register scaling is determined by user programmed CT and or PT constants On standard PowerRail meters this register may not be reset 2 3 KWh Count Register The kWh Count display is a 7 digit resetable accumulating energy register This acts in a similar manner to the Trip display on a vehicle odometer e Press the key to select Total kWh or kWh Count display pages The kWh Count display remains visible for 1 minute before the unit reverts to Total kWh mode e Press and hold the fedi and we keys for approximately 5
4. al Ib 1A KWh Class 1 EN62053 21 amp BS8431 2 120 Nominal Load KW 1 Rdg 5 120 Nominal Load Green Backlit LCD 8 Digits h 9mm Legends kWh Memory 10 years without power Normally open volt free contacts 1 pulse per energy increment Pulse rate and length selectable Contacts 100V ac dc 100mA 5W max Isolation 2 5kV for 1 minute Operate 10C gt T lt 65C RH lt 75 Non Condensing Storage 25C gt T lt 75C Size 106 x 90 x 58mm Cut out 106 x 45mm Case Noryl UL94 V 0 Self Extinguishing Terminals Rising Cage 4 0mm Weight Approx 250g Page 14
5. ameter 3 1 5 Pulse Output Rate Programming This sets the amount of energy measured between each pulse output The scaling is dependant on the display scaling and therefore on the CT and PT programming Press p or ed to select pulse rates from a table Press Di when the desired value is set to move to the next parameter 3 1 6 Pulse Output Length Programming This sets the length in seconds of each pulse Press LI Or ed to select pulse lengths in seconds from a table Press P when the desired value is set to move to the next parameter 3 1 7 Pulse Output Testing The pulse test facility allows the pulse output hardware and external system connections to be commissioned without a measured load The LCD shows Pto off and Ptr run and the number of test pulses output The test pulse rate is set automatically dependant on the programmed pulse length maximum 0 5Hz Press L to start stop the test pulses Press p and be together to stop the test pulses and simultaneously reset the test counter Press iP when the test is complete to move to the next parameter PowerRail303 Page 8 Programming 3 1 8 KW Demand Period Programming This sets the time in minutes over which kW Demand measurements are averaged This is sometimes referred to as the sliding window or rolling average period Press pe or had to increase decrease the kW Demand period Press Pi when the desired value is set to move to the n
6. er 5A on standard meters Press the up key SS or down key pesi to select CT values from a table of standard primary currents Press Pi when the desired value is set to move to the next parameter For primary currents not found in the standard table use fine adjust To enter exit Fine Adjust mode press pe and Pa together for two seconds 3 1 2 Nominal Primary Current Programming Press the up key DE or down key E to increase decrease the CT primary setting in steps of 10A Press Pi when the desired value is set to move to the next parameter 3 1 3 Nominal Voltage Programming If no external Potential Transformer PT is fitted this is must be set to match the nominal line line voltage Un of the meter as detailed on its rating label If an external PT is fitted this should be set to match the PT nominal primary line line voltage rating in volts The PT secondary must match the nominal input rating of the meter eg 110V L L Press the up key dai or down key Di to select values from a table of standard PT primaries Press Pi when the desired value is set to move to the next parameter PowerRail303 Page 7 Programming For PT primaries not found in the standard table use fine adjust To enter exit Fine Adjust mode press BMS and Pi together for two seconds Press the up key ae or down key ial to increase decrease the PT setting in steps of 10V Press rn when the desired value is set to move to the next par
7. ext parameter 3 1 9 Baud Rate Programming This sets the Baud Rate of the serial communications if the Modbus option is fitted at the factory Press p or gii to select the desired baud rate from a table Press Pi when the desired value is set to move to the next parameter 3 1 10 Modbus ID Programming This sets the meters unique communications network ID Modbus address if the Modbus option is fitted at the factory Press Di Or hel to increase decrease the value Press i when the desired value is set to complete programming The programmed values are saved to non volatile memory which is secure in the event of a loss of auxiliary power to the meter PowerRail303 Page 9 Display Scaling 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 1 32 x Un x Ct The display pages are scaled as follows kW kWh Ke ls kWh fond Miadi 4 kWh lt 24 3 kW 0 001kW 0 01 kWh lt 243 kW 0 01 kW 0 1 kWh PowerRail303 Page 10 Commissioning 5 Commissioning 5 1 Standard Connections Vn P1 P2 I IT sef S1 2 IQ AJ O Q BEBE Ge L NO Vn V1 V2 V3 l4 11 12 12 13 13 3 Phase 3 or 4 Wire Optional Neutral P Lore 1 P2 6 Bid L N Vn V1 V2 V3 1 11 12 2 13 I3
8. seconds to reset the kWh Count register to zero Total kWh Register kWh Count Register Scaling of the energy registers is set by the nominal input currents and voltages and remains constant during normal operation of the meter Energy registers will accumulate from zero to 99999999 and then restart from zero lf no keys are pressed the meter will automatically revert to the Total kWh Register display after 60 seconds Both energy registers are stored in non volatile memory during power loss to the meter PowerRail303 Page 3 Operation 2 4 Instantaneous kW Display Press ed Instantaneous Power 2 4 1 REV CT The instantaneous power display may show negative values indicating export power or incorrectly wired inputs REV CT will also be shown indicating that the most likely cause of the negative reading is one or more current transformers fitted the wrong way round on the primary conductor 2 5 kW Demand Display Option Press ed kW Demand KW demand is only available on meters factory fitted with this option If the user sets a demand period of N minutes eg 30 minutes the display will be updated every N seconds eg every 30 seconds The display shows the average of all KW readings taken over the most recent demand period eg average over 30 minutes This average kW parameter is commonly known as kW Demand Press ed Peak kW Demand Peak KW demand is only available on meters factory fitted
9. with the demand option The display shows the largest value of kW demand recorded since the user last reset it The peak kW Demand value is stored during power loss to the meter 2 5 1 Resetting Peak kW Demand To reset Peak kW Demand press p and bad for approximately 2 seconds while displaying Peak kW Demand PowerRail303 Page 4 Operation 2 6 Setup Display Menu Each meter is configured to operate in a specific system The meter settings may be displayed on the LCD in the Setup Display Menu Hold Pi for 5 Seconds Current Transformer Primary The CT value should match the Nominal Primary rating of the current transformers fitted with the meter Press Pi Nominal Line Line Voltage or PT Primary If no external potential transformer PT is fitted Un is the Rated Nominal Line Line Voltage as detailed on the meter label If a PT is fitted its secondary voltage should match the Rated Nominal Line Line Voltage of the meter Un is then programmed as the Nominal Rated Primary Voltage of the PT Press Pi Output Pulse Rate PLr indicates the amount of energy accumulated between each pulse output Press Pulse On Time PLt indicates the length of time in seconds the output pulse contacts remain short circuit for each pulse Press Options Fitted OPt Is a code indicating which factory fit options are supplied on an individual meter This information may be requested when contacting technical
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