General Assist Technical Reference
VRF Electricity Charge Apportionment
PowerLogic PM5330 kWh meter integration for UTY-PEGX
Meter selection, electrical integration, communications, configuration and commissioning guidance
This article outlines how a Schneider Electric PowerLogic PM5330 multifunction power meter can be used to capture active energy (kWh) and active power / demand (kW) for electricity charge apportionment associated with UTY-PEGX VRF applications.
Electrical safety: Meter installation, current transformer wiring and voltage sensing must be completed by suitably qualified personnel. Isolate supplies before wiring and follow the meter manufacturer's installation instructions and local electrical requirements.
1. Recommended meter
| Item | Reference |
|---|---|
| Meter | Schneider Electric PowerLogic PM5330, PM5000 family |
| Primary use | Measurement of kWh and kW for cost allocation / apportionment |
| Active-energy accuracy | Class 0.5S |
| Voltage range | 20 to 400 V L-N / 35 to 690 V L-L |
| Current inputs | 1 A or 5 A CT inputs |
| Communications | RS-485 Modbus RTU / ASCII |
2. Meter capabilities relevant to apportionment
- Energy and power: Active energy (kWh), active power and apparent power measurement.
- Accuracy: Class 0.5S active-energy accuracy to IEC 62053-22.
- Demand: Min/Max and demand functions with timestamped logging capability within the PM5000 family.
- Pulse output: Configurable from 1 to 9,999,999 pulses/kWh, 50% duty cycle, with digital output up to 25 Hz.
- RS-485: Modbus RTU / ASCII at 9.6, 19.2 or 38.4 kbps with even, odd or no parity.
Integration method: The meter may be integrated through Modbus communications or, where the applicable UTY-PEGX workflow uses pulse collection, via a compatible pulse-input device or gateway. Confirm the actual site architecture before commissioning.
3. Physical and electrical integration
| Connection | Requirement |
|---|---|
| Voltage sensing | Connect to the appropriate 1P+N, 3P or 3P+N supply configuration within the meter's voltage limits. Provide isolation and protection to suit site standards. |
| Current sensing | Connect 1 A or 5 A CT secondaries to the PM5330 current inputs. Observe CT polarity and burden requirements. |
| Control power | 100 to 415 V AC, 45-65 Hz, or 125 to 250 V DC. |
| RS-485 | Use twisted-pair shielded cable, daisy-chain the bus and assign each meter a unique Modbus address. Baud and parity must match the gateway / collector. |
| Pulse output | Where used, connect the PM5330 digital output to a compatible pulse-input device and ensure the receiver supports the configured pulse rate, including the 25 Hz digital-output limit. |
4. PM5330 configuration checklist
- CT / VT ratios: Enter the installed ratios so kWh and kW values scale correctly.
- Energy direction: Select delivered, received or net energy as required by the site's accounting method.
- Demand method: Configure fixed or sliding block demand and the required averaging interval.
- Clock: Synchronise meter time so readings and period closes align with the apportionment system.
- Modbus: Set address, baud rate and parity to match the connected gateway / collector.
- Pulse mode: If pulse collection is used, configure the meter constant and confirm pulse width / duty-cycle compatibility with the receiver.
5. Data points for UTY-PEGX apportionment
| Data point | Purpose |
|---|---|
| Total Active Energy (kWh) | Cumulative energy value used for each metered circuit / tenant. |
| Total Active Power (kW) | Instantaneous value used for live reasonableness checks and load validation. |
| Demand kW | Optional but recommended for present, last and peak demand cross-checks. |
| Power Factor / Voltage | Optional quality-screening values that assist with commissioning and fault investigation. |
Modbus workflow: Map the PM5330 cumulative kWh total and the required kW / demand values in the gateway. Pulse workflow: configure the pulses-per-kWh factor in the meter and ensure the same conversion constant is used by the receiving apportionment workflow.
6. Commissioning and validation
- Electrical checks: Confirm phase rotation and CT polarity. Under a normal positive load, measured kW should be positive.
- Scaling check: Apply or observe a stable load and confirm the measured kW is reasonable for the measured voltage, current and power factor.
- System comparison: Confirm the value presented to the UTY-PEGX apportionment workflow matches the PM5330 within the expected system tolerance.
- Energy sanity check: Record the starting kWh value, operate the load for a controlled period and confirm the receiving system accrues energy at a comparable rate.
- Logging: Where available, enable meter or gateway data/event logging to support future audits and dispute resolution.
7. Environmental and compliance reference
- Protection: IP52 front face and IP30 body.
- Operating temperature: -25 °C to 70 °C.
- Humidity: 5-95% RH, non-condensing.
- Referenced standards: IEC 61010, IEC 62053-22 and IEC 61557-12.
Important: This article is a field integration reference. Meter register mapping, gateway compatibility and the exact UTY-PEGX apportionment architecture must be confirmed against the project design and the applicable manufacturer documentation before commissioning.
General Assist Technical Reference