Installation Video Guide
Watch the complete installation walkthrough before starting. The video covers DIN rail mounting, CT clamping, RS485 wiring, and gateway commissioning.
HPzenAi Energy Meter — Complete Installation Walkthrough
Video coming soon
Walkthrough video will be added here
Tools Required
Gather these tools before starting. A qualified electrician must perform all wiring inside the electrical panel.
Flat-Head Screwdriver
For tightening terminal block screws on the energy meter and gateway
Wire Strippers
To prepare RS485 cable ends and power supply leads before termination
DIN Rail Cutters or Hacksaw
To cut 35 mm DIN rail to length if a new section is being installed
Multimeter
To verify 12V DC supply voltage and confirm RS485 continuity before power-on
RS485 Shielded Twisted-Pair Cable
2-core shielded cable for RS485 communication — not included, sourced separately
Cable Ties / Cable Duct
For neat cable management inside the electrical panel
What's in the Box
Verify all items are present before beginning installation. Contact support if anything is missing or damaged.
Energy Meter Unit
Main DIN rail-mounted meter body with LCD display
Split-Core CT(s)
60A split-core clamp-on current transformer — 1× for EM-1P-60A, 3× for EM-3P-60A
CT Connection Cables
Pre-terminated CT leads for connecting CTs to the meter input terminals
DIN Rail Mounting Clip
Standard 35 mm DIN rail mounting clip (integrated into meter body)
Installation Guide
Printed quick-reference card for mounting, wiring, and commissioning
CT Installation — Clamping the Current Transformer
Split-core CTs clamp around the phase conductor without cutting any wires. The load does not need to be switched off for CT installation — but all panel work must be performed by a qualified electrician.
Image
- 1Identify the phase conductor(s) to be metered — L for single-phase, L1/L2/L3 for three-phase.
- 2Open the split-core CT by unclipping the two halves at the hinge point.
- 3Position the CT around the phase conductor so the conductor passes through the CT aperture.
- 4Close the CT halves firmly until the latch clicks — ensure there is no gap between the two halves.
- 5Verify the CT arrow or polarity mark points in the direction of current flow toward the load.
- 6For EM-3P-60A, install a separate CT on each of the three phase conductors — L1, L2, and L3.
- 7Do not clamp the CT around both live and neutral conductors simultaneously — this results in zero reading.
- 8Plug the CT leads into the corresponding CT input terminals on the energy meter body.
DIN Rail Mounting & Power Wiring
Mount the energy meter on the 35 mm DIN rail in the electrical panel and connect the voltage sense and 12V DC supply wiring.
Image
- 1Snap the energy meter onto the 35 mm DIN rail — press the top clip onto the rail then push the bottom in until it locks.
- 2Connect the voltage sense input: L to the meter's L (voltage) terminal for single-phase; L1, L2, L3 for three-phase.
- 3Connect Neutral (N) to the meter's N terminal for single-phase installations.
- 4Connect the 12V DC power supply: + to the meter's 12V input terminal, − to GND.
- 5Verify all terminal screws are tightened firmly — loose connections cause intermittent readings.
- 6Ensure the meter LCD powers on and displays voltage after the 12V supply is connected.
RS485 Wiring to Gateway
Connect the energy meter to the HPzenAi Gateway via shielded RS485 cable for communication and data upload.
Image
- 1Run shielded RS485 twisted-pair cable from the energy meter to the HPzenAi Gateway.
- 2Connect the meter's RS485 A terminal to the gateway RS485 A terminal.
- 3Connect the meter's RS485 B terminal to the gateway RS485 B terminal.
- 4Connect the cable shield to earth at the gateway end only — do not earth both ends.
- 5If multiple meters share one RS485 bus, daisy-chain A-to-A and B-to-B between devices.
- 6Ensure each meter on the bus has a unique Modbus address (factory default is 1; adjust via meter DIP switches or configuration).
- 7For bus runs longer than 300 m, fit a 120 Ω termination resistor between A and B at the furthest meter.
Commissioning & Gateway Linking
After wiring, commission the meter by verifying live readings and linking the device to the HPzenAi app.
Image
- 1Power on the panel supply and confirm the energy meter LCD shows live voltage and current readings.
- 2Open the HPzenAi app and navigate to Gateway → RS485 Scan.
- 3Wait for the scan to complete — the energy meter should appear with its Modbus address.
- 4Tap the detected meter and confirm Link to add it to your device list.
- 5Verify real-time power data (V, A, kW, PF) is displayed on the meter tile in the app.
- 6Apply a known load (switch on a pump or appliance) and confirm the app power reading increases accordingly.
- 7Configure alerts and cost rates: Meter → Settings → Energy Cost and Demand Alert.
Installation Checklist
Use this checklist before handing over the installation or proceeding to automation setup.
- 1Energy meter mounted securely on DIN rail.
- 2CT(s) clamped firmly around phase conductor(s) with no gap.
- 3CT polarity arrow pointing toward load (direction of current flow).
- 4CT leads plugged into correct meter input terminals.
- 5Voltage sense terminals connected — L (and N for single-phase).
- 612V DC supply connected and meter LCD active.
- 7RS485 A and B wired correctly to gateway — not swapped.
- 8Cable shield earthed at gateway end only.
- 9Unique Modbus address confirmed for each meter on the bus.
- 10Meter visible in HPzenAi app with live readings.
- 11Live load test confirms correct power readings.
- 12No exposed conductors or loose terminal screws.
Important Installation Notes
Follow these precautions during installation and service.
- 1All panel wiring must be performed by a qualified electrician in accordance with local electrical codes.
- 2Isolate the panel supply before making any voltage sense or power supply connections.
- 3CT installation around live conductors is permitted without isolating the load — exercise appropriate caution.
- 4Do not exceed the 60A CT rating — fit a larger CT and external meter for higher current applications.
- 5Keep RS485 signal cables separated from mains power cables to prevent interference.
- 6Replace CT leads if insulation is cracked or damaged — do not repair with tape.