1. Introduction
The EARU PC321-TY Power Clamp is designed to monitor electricity usage in your facility by connecting current transformer clamps to the power cables. It can measure Voltage, Current, Active Power, Power Factor, and total energy consumption in real-time. This device is compatible with both single-phase and three-phase electricity systems.
This guide provides an overview of the product and assists with the initial setup and installation.
Key Features:
- Tuya compliant, supporting Tap-to-Run and automation with other Tuya devices.
- Compatible with Single/3-phase electricity.
- Measures real-time Voltage, Current, Active Power, and total energy consumption.
- Suitable for both residential and commercial applications.
- Lightweight and easy to install.
- External antenna prevents signal from being shielded.
Note: The bidirectional measurement function only supports the WiFi version and does not support the ZigBee version.
2. Safety Handling
WARNING: Failure to follow these safety notices could result in fire, electric shock, other injuries, or damage to the Power Clamp and other property. Read all the safety notices below before using the Power Clamp.
- The power clamp must be installed and serviced only by qualified electrical personnel.
- Do not touch the terminals of the device during testing.
- Turn off all power supply for this equipment before installing.
- Make sure that the power supply is off before connecting or disconnecting it to an auxiliary device.
- Always use a properly rated voltage sensing device to confirm power is off.
- Replace all devices, doors, and covers before applying power to the equipment.
- Avoid high humidity or extreme temperatures.
- Avoid long exposure to direct sunlight or strong ultraviolet light.
- Do not drop or expose the unit to intense vibration.
- Do not disassemble or try to repair the unit on your own.
- Do not expose the unit or its accessories to flammable liquids, gases, or other explosives.
3. Product Overview
Familiarize yourself with the components of your energy meter:
Components:
- Main Unit: The central processing unit for energy measurement.
- CT (Current Transformer) Clamps: Used to measure current flow in power cables. The device supports 3 CT clamps.
- External Antenna: For wireless communication (WiFi or ZigBee).
- AC Input Cable: For powering the device.
- LED Indicator: Provides status feedback (Red LED flashing: Device not joined to ZigBee network; Green LED solid on: Device joined to ZigBee network).
- Reset Button: Located on the back of the main unit. Press and hold for 5 seconds to restore factory settings (energy data will not be cleared). Press twice consecutively within 10 seconds to clear energy data.
4. Technical Specifications
| Feature | Specification |
|---|---|
| Model Number | PC321-TY |
| Brand Name | EARU |
| Power Supply | AC |
| Output Voltage | 100-240V AC 50/60 Hz |
| Rated Current | 80A-1000A (Optional) |
| Max Operating Current | 150A & Above |
| Accuracy Class | 1% |
| Phase | Three Phase |
| Operating Temperature | -20 ℃ - +55 ℃ |
| Operating Humidity | ≤ 90% non-condensing |
| Dimensions | 86*86*37mm |
| Wireless Frequency | WiFi 2.4GHz IEEE 802.15.4 |
| Protocol | ZigBee 3.0 |
| Report Cycle | 5 Seconds |
| Certification | CE, RoHS |
| Battery Included | No |
CT Clamp Specifications:
| Model | 80A | 120A | 200A | 300A | 500A | 750A | 1000A |
|---|---|---|---|---|---|---|---|
| Φ (Inner Diameter) | 10mm | 16mm | 24mm | 24mm | 36mm | 50mm | 50mm |
| A | 34mm | 37mm | 53mm | 53mm | 68mm | 93mm | 93mm |
| B | 24mm | 30mm | 45mm | 45mm | 59mm | 82mm | 82mm |
| C | 42mm | 51mm | 65mm | 65mm | 90mm | 122mm | 122mm |
| E | 32mm | 43mm | 44mm | 44mm | 53mm | 70mm | 70mm |
| G | 26mm | 34mm | 34mm | 34mm | 42mm | 60mm | 60mm |
5. Installation and Wiring
Important: Please make sure the main power in your facility is OFF before installing. Failure to follow these instructions will result in death or serious injury.
5.1. Mounting the Device
The Power Clamp unit has a mounting bracket for installation:
- Use the mounting bracket as a template to mark two holes on the wall for screws.
- Secure the mounting bracket onto the wall using screws. Install wall plugs if necessary.
- Align the hooks of the mounting bracket with the mounting holes on the Power Clamp unit. Fit the hooks into the mounting holes to secure the device.
5.2. Wiring Instructions
Follow the schematics below as an example to wire the Power Clamp for different phases.
5.2.1. Connecting AC Input Cable
- Connect the AC Input cable to a socket near the Electrical Box to power on the Power Clamp according to the corresponding phase wiring diagram.
- Attach both ends of the Current Transformer Cables. Spin the waterproof latch clockwise until both ends are tightened and secured.
5.2.2. Connecting CT Clamps
Open the clamp and apply it to the electric meter cable. The arrow on the clamp should face the correct direction of the electricity current flow (P1→P2). If the arrow faces the reverse direction, the reading meter will display 0.
Important Note:
- The phase of the circuit measured by the CT needs to be consistent with the power supply phase of that CT. For example, if the CT of L1 measures the L1 circuit, the power supply for L1 must also be connected to the L1 phase. You cannot clamp the CT of L1 on the L2 phase if the power supply of L1 is still connected to the L1 phase.
- Ensure the clamp of L1/L2/L3 corresponds to L1/L2/L3 of the circuit to be tested.
- The arrow on the clamp should face the correct direction of the electricity current flows.
5.2.3. Wiring Diagrams
3 Phase electricity wiring diagram:
Video Tutorial for Wiring:
Video 1: Step-by-step guide on wiring the energy meter in a three-phase electrical box. It demonstrates connecting neutral and phase wires, and correctly installing CT clamps with attention to current direction.
6. Network Configuration
The device can be configured via the Smart Life App. Ensure your wireless router operates on 2.4GHz.
6.1. Download the Smart Life App
Download the "Smart Life" application from your App Store or Google Play Market. You can also scan the QR code below to download and install.
6.2. Pairing Method 1 (Scan)
- Open the Smart Life app and click the 'Scan' button in the upper right corner of the App Home page.
- Scan the QR code provided in the manual (or on the device/packaging) to configure the network.
6.3. Pairing Method 2 (ZigBee Gateway)
Note: This method is for the ZigBee version and requires a dedicated ZigBee gateway.
- Make sure your Tuya ZigBee gateway is successfully connected to your Smart Life App.
- Ensure the power clamp is within the signal range of your Tuya ZigBee Gateway.
- Power on the power clamp. If the LED indicator is not flashing red, reset the device (press and hold the reset button for 5 seconds).
- Enter your ZigBee gateway settings in the Smart Life App and set it to permit joining to add a subdevice.
- After a few seconds, the power clamp will automatically join the gateway. Once successfully added, you will see the new power clamp in the Smart Life App.
7. Operating Instructions
Once installed and configured, the EARU PC321-TY energy meter allows you to monitor various electrical parameters through the Smart Life App.
7.1. Real-time Monitoring
Monitor Current, Active Power, Voltage, and Power Factor in real-time. Daily, weekly, and monthly consumption and production data can be viewed with charts in the Tuya App. This allows you to see how much electricity you are consuming, when, and how much excess energy you are producing back to the grid.
7.2. Bidirectional Measurement (WiFi Version Only)
The WiFi version supports bidirectional measurement, allowing you to track both energy consumption ("From Grid" energy) and energy production ("To Grid" energy), which is particularly useful for solar panel installations.
- Clip Clamp1 onto Grid: Measures "From Grid" or "To Grid" energy. If the measured current direction is P1→P2, energy is accumulated as "From Grid" energy. If P2→P1, energy is accumulated as "To Grid" energy.
- Clip Clamp2 onto Inverter: Measures how much energy is generated by the inverter. The clamp direction needs to point to the Inverter.
- Clip Clamp3 onto Load: Measures how much energy is consumed by the load. The clamp direction needs to point to the Load.
7.3. Voice Control
The device supports voice control through intelligent speakers like Amazon Alexa and Google Assistant, allowing for hands-free operation.
8. Maintenance
- Keep the device clean and free from dust.
- Avoid exposing the device to direct sunlight, high humidity, or extreme temperatures.
- Regularly check wiring connections for tightness and integrity.
- If the device malfunctions, do not attempt to repair it yourself. Contact qualified personnel.
Resetting the Device:
To restore the power clamp to default factory settings (energy data will not be cleared), press and hold the reset button for 5 seconds until the Red LED indicator flashes 3 times quickly. The device will then enter EZ mode for 3 minutes.
To clear energy data, reset the Power Clamps twice consecutively. The interval between two resets must be less than 10 seconds. After successful operation, the indicator light will flash alternately red and green 3 times.
9. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Device not powering on | No power to AC input cable or faulty connection. | Check AC input cable connection and power source. Ensure main power is on after installation. |
| LED indicator not flashing red during pairing | Device not in pairing mode or already paired. | Press and hold the reset button for 5 seconds to enter pairing mode. |
| Inaccurate readings or 0 display | Incorrect CT clamp direction or phase mismatch. | Ensure the arrow on the CT clamp points towards the load. Verify that the CT clamp for each phase (L1, L2, L3) is connected to its corresponding phase wire. |
| No data in Smart Life App | Device not connected to network or out of range. | Check WiFi (2.4GHz) or ZigBee gateway connection. Ensure device is within signal range. Re-pair if necessary. |
| ZigBee version not showing bidirectional measurement | ZigBee protocol limitation. | Bidirectional measurement is only supported by the WiFi version. This is expected behavior for ZigBee models. |
10. User Tips
- Neutral Wire Requirement: The meter requires a neutral wire for accurate voltage, current, and power measurements. Ensure your measured circuit includes a neutral wire.
- CT Clamp Direction: Always double-check the direction of the arrow on the CT clamps. It must point towards the load for correct consumption readings. For solar generation, the arrow should point away from the load (towards the grid/inverter).
- Phase Correspondence: When using multiple CT clamps in a three-phase system, ensure that each clamp (L1, L2, L3) is correctly installed on its corresponding phase wire. Mismatched phases will lead to incorrect data.
- App Data Visualization: The Smart Life app provides bar graphs for kWh consumption per phase. While current measurements are available, trend lines for current might not be directly supported in the same graphical format as energy consumption.
- Alerts and Routines: The device can often be integrated with smart home platforms like Alexa for routines. Check the Smart Life app for options to set up alerts based on consumption or lack thereof, and to create routines with other smart devices.
- Signal Strength: For ZigBee versions, ensure the device is close enough to the ZigBee gateway for a stable connection. For WiFi, a strong 2.4GHz signal is crucial.
11. Warranty and Support
For warranty information and technical support, please refer to the official product page or contact the seller directly. This manual provides general operational guidelines and does not cover specific warranty terms or advanced support procedures.
A user manual in PDF format is available for download: User manual (PDF).
