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Totalizing with the kV2

Totalizing with the kV2. Revised 6-7-00. Z Soft Switch. Totalization and External Pulse Input Scaling Enables combining data from up to 5 meters 4 external meter inputs plus the kV2 metered data External inputs require use of the Multiple I/O option board

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Totalizing with the kV2

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  1. Totalizing with the kV2 Revised 6-7-00

  2. Z Soft Switch • Totalization and External Pulse Input Scaling • Enables combining data from up to 5 meters • 4 external meter inputs plus the kV2 metered data • External inputs require use of the Multiple I/O option board • Up to 8 data combinations allowed -- “totalization maps” • Add or subtract inputs with the same engineering units • May use one totalization channel as input to a second totalization channel • Enables data scaling of external pulse inputs • External inputs may be recorded and displayed as unscaled raw pulse counts without the Z soft switch installed

  3. Multiple I/O Option Board • Expanded Functionality • 2 Three-Wire Outputs • 6 Two-Wire Outputs • 4 Pulse Inputs (Three-Wire or Two-Wire) • 1 RTP Input • All outputs configurable for: • Pulse Initiator functions • Alerts, Diagnostics, & Cautions • Load Control Operation • Solid State relays • Max. ratings: 120 VAC, 0.1 AAC; 170 VDC, 0.1 ADC • RTP and pulse inputs require 5~24 VDC, 8 mADC minimum • Not compatible with the kV meter

  4. kV kV kV2 Wiring the external inputs • An external DC power supply must be connected in series with the “K” lines between between the kV2 inputs and the pulse initiator outputs • If only two-wire inputs are used, use the kV2 “K” and “Z” input leads • Shield signal lines and surge protect the power supply as needed • The kV2 inputs must see 5 VDC minimum to be recognized • Maximum input pulse rate = 30 pulses/second • Minimum input pulse duration = 33 milliseconds/pulse • Inputs are sampled 60 times per second • Every input state change is counted as a pulse K1 Z1 Source Meters (4 max.) Totalizing Meter Z2 K2 Power Supply 5~24V DC K1 & K2

  5. kV2 MI/O Pulse Input Schematic User Connections Inputs to the Microprocessor User Connections Inputs to the Microprocessor Note: Four inputs are available. Only two are shown here for clarity. If only 2-wire inputs are used, connect to K & Z inputs.

  6. kV2 MI/O Pulse FM C Output Schematic Outputs from the Microprocessor User Connections Outputs from the Microprocessor User Connections

  7. kV2 MI/O Pulse 2-wire Output Schematic Outputs from the Microprocessor User Connections Note: Six two-wire outputs are available. Only two are shown here for clarity.

  8. Totalized Demand

  9. Application Considerations • Combine inputs with the same unit type (Wh + Wh, varh + varh, etc.) • Combining kVA (Phasor, Apparent) pulses results in an “arithmetic” total of vector quantities and may result in unexpected answers • Consider combining orthogonal quantities (wh, varh, distortion VAh), then convert them to a Phasor or Apparent kVAh value • External equalization of pulse inputs is not required • Pulse scaling is done via software programming

  10. External Input Pulse Scaling • Scaling pulse inputs for programmed input: • Determine the primary value of the pulse inputs • Divide by the TF of the kV2 totalizing meter • Program the kV2 external pulse input parameter with the resulting value • Example: • Sub-meter #1 is programmed for a pulse output of 0.15 wh/pulse (secondary) with a CTR=600:5, TF=120. • A kV2 meter has a CTR=400:5, TF=80. • Determine the program value to correctly totalize the pulse input from Sub-meter #1 with the kV2 measured energy. • Solution: • Primary value of pulse input = 0.15 wh/pulse * 120 = 18 wh/pulse • Programming value = (18 wh/pulse) / 80 = 0.225 wh/pulse

  11. Programming Considerations • Make sure the measurement Profile contains at least one Totalization entry and one External Pulse Input (scaled) • To display the external inputs individually as scaled values, create separate Totalization channels for each input, map each input to its own totalization channel, and display the totalized channel. • Make sure the Totalization option is enabled for the MeterMate Program file • Define the I/O and Alerts support table first • Define the Totalization support table second • Before programming the kV2 meter, make sure the Z soft switch is enabled and the Multiple I/O option board is installed • If you wish to record the pulse inputs and/or totalized result, make sure either the R or X soft switch is enabled and the Recorder support table is configured appropriately • Data accumulations may be selected for display, and will always appear in the Site Status report from MMDOS

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