Summary
This article explains how to connect and configure kWh meters so UTY-PEGX can apportion electricity costs across tenants/zones. It covers wiring at a high level, how pulses are brought into the system controller, and the grouping rules that must be followed so apportionment is valid. SysCon_Install_Electricity_Mete… UTY-PEGX
Applies to
Sites using UTY-PEGX/System Controller for electricity charge apportionment
Sub-metering with whm/kWh meters that provide pulse outputs (preferred) or measurement lines via CT/VT to a pulse converter as shown in the system controller documentation
SysCon_Install_Electricity_Mete…
How the kWh meter is used by UTY-PEGX
UTY-PEGX totals active energy (kWh) for each allocation boundary (e.g., tenant/contract) using pulses from a kWh meter. Each pulse represents a fixed energy quantum (meter constant), which UTY-PEGX converts to kWh for reporting and billing. Meters are associated to groups (remote controller groups, RB groups, outdoor groups) and contracts defined in the apportionment setup. UTY-PEGX
Electrical integration (overview)
Per the installation schematic, a typical arrangement includes:
Electricity meter (whm) measuring the circuit via CTs (and VT/PT if required).
Pulse transmission line (CVV-S) from the meter’s pulse output to the System Controller via the external input connector (Wire A, P/N 9368777005).
Measurement lines and power supply to the meter as per local electrical rules.
Field-supplied parts include the whm, CT, VT (if used) and all cables.SysCon_Install_Electricity_Mete…
Commissioning essentials
Program the meter constant (pulses/kWh) into UTY-PEGX so pulses convert to correct kWh totals.
Verify pulse polarity and that the pulse width/frequency are within the controller’s input specification.
SysCon_Install_Electricity_Mete…
Grouping & placement rules (must-follow)
To ensure correct totals in UTY-PEGX, place meters with respect to system groups as follows (see diagrams for examples):
Do not split a Remote Controller Group with meters (i.e., don’t meter only part of a group).
UTY-PEGX
Do not split an Outdoor Unit Group with meters.
UTY-PEGX
It is permissible to divide RB Groups with meters (RB group metering is OK).
UTY-PEGX
Cross-contract metering is prohibited. If you are using meters for apportionment, install them so that the contract settings in UTY-PEGX are not bypassed or “skipped.” Each meter must align cleanly to a single contract.
UTY-PEGX
Step-by-step (field workflow)
Define contracts and groups in UTY-PEGX (one contract per tenant/charge point). Map indoor units/RB groups appropriately.
UTY-PEGX
Install meters on the electrical feeders serving each contract boundary—respect rules 1–4 above to avoid split-group or cross-contract installations.
UTY-PEGX
Wire CT/VT and supply to each meter. Bring the pulse output to the system controller’s external input using the specified connector/wiring.
SysCon_Install_Electricity_Mete…
Configure pulse constants in UTY-PEGX and label each input with the matching contract/site area.
SysCon_Install_Electricity_Mete…
Validate counts: Run a timed-load test; confirm pulse counts and UTY-PEGX kWh increase correspond to the meter’s register.
SysCon_Install_Electricity_Mete…
Good practice & troubleshooting
One meter per contract boundary. Never mix loads across contracts.
UTY-PEGX
Keep wiring short and shielded on pulse lines; follow local regulations for measurement, control and ELV cabling.
SysCon_Install_Electricity_Mete…
If totals look low/high, re-check the meter constant, pulse polarity, and that the meter is not splitting a group unintentionally.
UTY-PEGX
Safety & compliance
All CT/VT and meter work must be performed by licensed personnel under local electrical rules. Follow the manufacturer’s installation instructions and the system controller guidance for connectors and pulse wiring. SysCon_Install_Electricity_Mete…