VRF — Electricity Charge Apportionment (kWh Meter Integration for UTY-PEGX)

Summary

This article outlines how to use a common multifunction kWh meter—Schneider Electric PowerLogic PM5330—to capture kWh and kW demand for UTY-PEGX apportionment. It covers meter capabilities, wiring/communications, configuration, and verification steps relevant to VRF sites.

METSEPM5330

Recommended meter (reference platform)

  • Model: PowerLogic PM5330 (PM5000 family) — multifunction power meter with Modbus comms and pulse outputs. Key attributes include Class 0.5S active-energy accuracy, voltage up to 690 V L-L, 1 A/5 A CT inputs, and RS-485 Modbus RTU/ASCII.

    METSEPM5330

    PM5330 Tech leaflet

Meter capabilities relevant to apportionment

  • Energy & Power: Active energy (kWh) and active/apparent power with high accuracy suitable for sub-billing/cost allocation.

    PM5330 Tech leaflet

  • Accuracy class: Class 0.5S for active energy (IEC 62053-22).

    METSEPM5330

  • Measurement ranges: 20…400 V L-N / 35…690 V L-L; currents via 1 A or 5 A CTs (10 mA to 9 A through the meter).

    METSEPM5330

  • Demand & logging: Min/Max and demand functions with timestamped logs (model-family feature set).

    PM5330 Tech leaflet

  • Pulse outputs (alternative to Modbus): Meter constant configurable 1 to 9,999,999 pulses/kWh, 50% duty, up to 25 Hz on digital output; optical LED supports higher rates. Useful if UTY-PEGX ingests pulse inputs via a gateway.

    PM5330 Tech leaflet

  • Communications: RS-485; Modbus RTU/ASCII, 9.6/19.2/38.4 kbps, parity even/odd/none.

    METSEPM5330

Physical & electrical integration (high level)

  1. Voltage sensing: Connect to the appropriate phases (1P+N, 3P, or 3P+N) within the meter’s voltage limits; isolate and protect as per site standards.

    METSEPM5330

  2. Current sensing: Route secondary of 1 A or 5 A CTs to PM5330 current inputs; observe CT polarity and burden guidance.

    METSEPM5330

  3. Control power: 100…415 V AC (45–65 Hz) or 125…250 V DC supply.

    METSEPM5330

  4. RS-485 bus: Daisy-chain the PM5330 with twisted-pair shielded cable; set a unique Modbus address, baud, and parity to match your UTY-PEGX gateway/collector.

    METSEPM5330

  5. Pulse-output option (if used): Wire the PM5330 digital output to your pulse input device; configure pulses/kWh and ensure the receiver supports the 25 Hz max rate.

    PM5330 Tech leaflet

Configuration checklist (PM5330)

  • CT/VT ratios: Program the installed CT/VT values so kWh/kW scale correctly. (PM5000 supports direct entry of ratios.)

    PM5330 Tech leaflet

  • Energy direction: Choose delivered/received/net as required for your site accounting. (Selectable energy modes in PM5000 family.)

    PM5330 Tech leaflet

  • Demand method & interval: Set fixed/sliding block and the averaging interval your apportionment model expects.

    PM5330 Tech leaflet

  • Clock & timestamp: Synchronize time (SNTP via gateway where supported) for consistent period closes.

    PM5330 Tech leaflet

  • Modbus comms: Set address, baud (9.6/19.2/38.4 kbps), and parity (even/odd/none).

    METSEPM5330

  • Pulse mode (if used): Configure meter constant and verify receiver pulse width/duty compatibility.

    PM5330 Tech leaflet

Data points to acquire for UTY-PEGX apportionment

At minimum, acquire:

  • Total Active Energy (kWh) — cumulative, for each metered circuit/tenant. Class 0.5S.

    METSEPM5330

  • Total Active Power (kW) — instantaneous, for live reasonableness checks and demand validation.

    PM5330 Tech leaflet


    Optional but recommended:

  • Demand kW with timestamp (present/last/peak & peak-time) for cross-checks,

  • Power factor and voltage for quality screening.

    PM5330 Tech leaflet

Note: If your UTY-PEGX workflow uses Modbus registers, map the PM5330’s kWh total and kW total/demand objects in your gateway. If pulses are used, set the pulses/kWh factor and enter that constant into UTY-PEGX so it converts pulses into energy correctly.

PM5330 Tech leaflet

Commissioning & validation

  1. Electrical checks: Confirm phase rotation and CT polarities (kW should be positive under load).

  2. Scaling checks: With a known stable load, verify that kW approximates V×I×PF and that the UTY-PEGX value matches the meter within expected tolerance.

  3. Energy sanity: Record the meter’s kWh, run a timed test (e.g., 30–60 min), and confirm UTY-PEGX accrual tracks the meter.

  4. Logging: Enable data/event logs to support later audits or dispute resolution.

    PM5330 Tech leaflet

Environmental, safety & compliance notes

  • Meter front IP52, body IP30; operating –25 °C to 70 °C; 5–95 % RH (non-condensing).

    METSEPM5330

  • Complies with IEC 61010, IEC 62053-22, IEC 61557-12, and related standards; suitable for cost allocation and sub-billing contexts when installed as specified.

    METSEPM5330

    PM5330 Tech leaflet

Attachments / References

  • Product data sheet — PowerLogic PM5330 (key electrical and comms characteristics).

    METSEPM5330

  • Technical datasheet — PowerLogic PM5000 series (functions, logging, pulse options, and integration details).

    PM5330 Tech leaflet

If you would like, I can add a UTY-PEGX field template (pre-filled meter constants and data-point names) and a one-page wiring diagram for RS-485 and pulse integration.