Summary of Contents for ND MultiCube Single Phase
- Page 1 MultiCube Single Phase Multi-Function Electricity Meter Installation and Operation...
- Page 3 PREFACE MultiCube Single Phase Meter Operating Guide Revision 5.02 December 2004 This manual represents your meter as manufactured at the time of publication. It assumes standard software. Special versions of software may be fitted, in which case you will be provided with additional details.
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Page 4: Table Of Contents
Table Of Contents SAFETY............................... 5 ............................5 ARNING YMBOLS ............................... 5 AINTENANCE METER OPERATION ..........................6 ............................6 EASUREMENTS 2.1.1 Rolling Demand (I kW, kVA and kvar Demands) ................6 ..............................8 OWER ............................. 8 ISPLAY AGES AMPS & PEAK AMPS............................9 VOLTS &... -
Page 5: Safety
Meter Operation 1. Safety 1.1 Warning Symbols This manual provides details of safe installation and operation of the meter. Safety may be impaired if the instructions are not followed. Labels on individual meters give details of equipment ratings for safe operation. Take time to examine all labels on the meter and to read this manual before commencing installation. -
Page 6: Meter Operation
Meter Operation 2. Meter Operation 2.1 Measurements The MultiCube makes use of a high speed micro-processor and an Analogue to Digital converter to monitor input signals. The phase voltage, current and power (kW) are measured directly and a number of other parameters derived from these in software. - Page 7 Meter Operation On power up (or after a brown-out) the sub-period array values are reset to zero. During the first full MD period the Rolling Demand value will accumulate as the zeroes are replaced with valid sub-period averages. 2.1.1.2 Peak Demand (kW and I Pk Demand) Peak MD readings are the maximum recorded values of corresponding Rolling Demand values.
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Page 8: Power Up
Meter Operation 2.1.1.3 Meter Types Five Single Phase MultiCube meter types are available to suit a range of applications. The meter type defines a number of display pages which may be selected and the parameters metered. This manual covers all meters independent of type. 2.2 Power Up On power up the MultiCube shows the meter type and software issue. -
Page 9: Amps & Peak Amps
Meter Operation Amps & Peak Amps Instantaneous true rms. Current scaled by the user programmable CT primary is updated each second on the bottom line. The largest measured instantaneous value (peak) is shown on the top Ampere Demand MD based on a rolling average calculation of Amps with a user programmable period 10s to 2500s An average display based on 10 sub-period values (1s to 250s) is updated at the end of each sub period... - Page 10 Meter Operation PF, Hz, VA Power Factor (‘-’ denotes capacitive). Frequency detected on voltage input signal. Instantaneous VA calculated as Volts x Amps. PF, Hz, var Power Factor (‘-’ denotes capacitive). Frequency detected on voltage input signal. Instantaneous var calculated as: var = √(VA (‘-’...
- Page 11 Meter Operation Export Wh Register Instantaneous watts integrated over time is accumulated in this register while the load is generating real power. The most significant 7 digit is displayed on the middle line. Import varh Register Instantaneous var integrated over time is accumulated in this register while the load is receiving real power.
- Page 12 Meter Operation Single Phase MultiCube Type 1 Menus Amps & Peak Amps Volts & Peak Volts PF, Frequency, Watts Import Wh Single Phase MultiCube Type 2 Menus Amps & Peak Amps Volts & Peak Volts PF, Frequency, Watts Import Wh PF, Frequency, var Single Phase MultiCube Type 3 Menus Amps &...
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Page 13: Display Scaling
Meter Operation 2.4 Display Scaling The MultiCube scales it’s displays automatically to provide the optimum resolution dependant on user settings (CT and PT Primary). This provides direct readings with decimal points and legends automatically selected (e.g. kW or MW etc). 2.4.1 Voltage Scaling (Phase, Peak) PT Setting Example Display... -
Page 14: Per Phase & System Power Scaling (W, Va, Var)
Meter Operation 2.4.3 Per Phase & System Power Scaling (W, VA, var) PT Setting x CT Setting Example Display 300VA – 3,000VA 2000.1 W 3,001VA – 30,000VA 2.000 kW 30,001VA – 300,000VA 20.00 kW 300,001VA – 3,000,000VA 200.0 kW 3,000,001VA – 30,000,000VA 2000 kW 30,000,001VA –... -
Page 15: Energy Register Reset
Meter Operation 2.5 Energy Register Reset All accumulating energy registers may be simultaneously reset to zero using the front panel keys. Once reset, energy readings are lost forever so great care must be taken when using this feature. To reset all energy registers •... -
Page 16: Isolated Pulse Outputs
Meter Operation 2.9 Isolated Pulse Outputs MultiCube meters which display kWh and/or Export kWh incorporate isolated pulse output(s). These outputs provide a simple interface to external systems such as building management centres etc. Each output takes the form of a normally open, volt free contact pair which provides a low resistance, for 100mS, at the end of a pre-set number of increments of the associated energy register (‘pulse rate’). -
Page 17: Installation
Installation 3. Installation 3.1 Panel Mounting Panels should be of thickness 1mm to 4mm with a square cut-out of 92mm (+0.8 - 0.0). A minimum depth of 72mm should be allowed behind the panel for the meter. Remove the panel mounting clips and insert the meter into the cut-out from the front of the panel. -
Page 18: Ct Connections
Installation 3.2 CT Connections The MultiCube is designed for use with an external current transformer (CT). Recommended types should conform to Class 1 per IEC 60044-1. The secondary of the CT should be specified to suit the input rating defined on the meter label. Cables used for the current circuit should have a maximum conductor size of 4.0mm should be kept as short as possible to reduce cable losses loading the CT secondary. -
Page 19: Auxiliary Mains Supply (L & N)
Installation 3.4 Auxiliary Mains Supply (L & N) The MultiCube uses an isolated auxiliary mains supply separate from the voltage measurement input. This may be connected separately or in parallel with the measurement inputs provided the ratings detailed on the instrument label are not exceeded. -
Page 20: Connection Schematics
Installation 3.5 Connection Schematics Figure 3-2 Single Phase Connection Page 20 Single Phase MultiCube... -
Page 21: Programming
Programming 4. Programming 4.1 Description The MultiCube is designed for use in a wide variety of systems. A range of programmable features allow the unit to be set-up for a specific application. Programming is available using the front panel keypad and display while the unit is operational. -
Page 22: Setting The Ct Primary Current
Programming 4.3 Setting The CT Primary Current The first item in the programming menu allows the user to set the CT Primary current, in the range 5A to 20000A, to match the primary of the current transformer connected to the meter inputs. The secondary of the CT must match the nominal input current specified on the meter label. -
Page 23: Setting The Pt Primary Voltage
Programming 4.4 Setting The PT Primary Voltage The next item in the programming menu allows the user to set the PT Primary line- line voltage, in the range 60V to 50,000V, to match the primary of the potential transformers connected to the meter inputs. The secondary of the PTs must match the nominal line-line input voltage specified on the meter label. -
Page 24: Setting Pulse Output 1 Rate
Programming 4.5 Setting Pulse Output 1 Rate Isolated pulse output #1 may be set to provide a single pulse at the end of every 1, 10, or 100 increments of the Wh register irrespective of display scaling and decimal point. This allows the unit to be configured to suit a wide variety of data logging, building management type applications. -
Page 25: Setting Pulse Output 2 Rate
Programming 4.6 Setting Pulse Output 2 Rate Isolated pulse output #2 may be set to provide a single pulse at the end of every 1, 10, or 100 increments of the Total varh register irrespective of display scaling and decimal point. This allows the unit to be configured to suit a wide variety of data logging, building management type applications. -
Page 26: Setting The Ampere Demand Period
Programming 4.7 Setting The Ampere Demand Period The averaging period used in calculation of Ampere Rolling Demand (ref. Section 2.1.1) may be set in the range 10-2500 seconds (steps of 10s). This period may be selected to set a convenient filter for short term fluctuations in input power, as required. -
Page 27: Setting The Kw Rolling Average Period
Programming 4.8 Setting The kW Rolling Average Period The averaging period used in calculation of Watts Rolling Demands (ref. Section 2.1.1) may be set in the range 1-60 minutes. This period may be selected to match specific standards, or to set a convenient filter for short term fluctuations in input power, as required. -
Page 28: Specification
Specification 5. Specification Inputs System 1-Phase 2 Wire Balanced/Unbalanced Loads Voltage Vb. 230 Volt. 1-Phase 2 Wire Vb. 120 Volt optional Ib 5 Amp from external current transformer (CT) Current Ib 1 Amp optional Fully Isolated (2.5kV / 1 minute) Measurement Range Voltage 20% to 120%... - Page 29 Specification Accuracy Current 0.2% Ib (1.0% Rdg. 0.05 Ib ≤ I ≤ 1.2 Ib) ±1 digit. 0.2% Vb (1.0% Rdg. 0.2 Vb ≤ V ≤ 1.2 Vb) ±1 digit. Voltage 0.4% FS (1.0% Rdg. 0.05FS ≤ P ≤ 1.2FS) ±1 digit. Watts 0.6% FS (1.5% Rdg.
- Page 30 Specification General Temperature -10 deg C to +65 deg C Operating -25 deg C to +70 deg C Storage Environment IP54 Humidity <75% non-condensing Mechanical Enclosure DIN 96mm x 96mm Mablex ULV94-V-O Dimensions 96mm x 96mm x 80mm (72mm behind panel) 130mm behind panel with options unit fitted Weight Approx.
- Page 32 Northern Design (Electronics) Ltd, 228 Bolton Road, Bradford, West Yorkshire, BD3 0QW, England. Telephone: +44 (0) 1274 729533 Fax: +44 (0) 1274 721074 Email: sales@ndmeter.co.uk support@ndmeter.co.uk Copyright Northern Design 2004...