1. Introduction
This manual provides detailed instructions for the installation, operation, and maintenance of the QJWYO KWS-306 Three-Phase Four Wire Energy Meter. The KWS-306 is a digital watt-hour meter designed for accurate measurement of AC power parameters in three-phase four-wire systems. It features a clear color LCD display and various protection functions.
2. Safety Information
WARNING: Installation and maintenance should only be performed by qualified personnel. Failure to follow these instructions may result in electric shock, fire, or serious injury.
- Always disconnect power before installing or servicing the meter.
- Ensure all wiring connections are secure and correct according to the wiring diagram.
- Do not operate the device if it appears damaged.
- Keep the device away from moisture and extreme temperatures.
3. Product Overview
The QJWYO KWS-306 is a versatile three-phase four-wire energy meter designed for DIN rail mounting. It provides real-time monitoring of voltage, current, power, frequency, power factor, and energy consumption. The device incorporates multiple protection features to ensure system safety and stability.
Figure 1: Front view of the KWS-306 energy meter, showing the color display and indicators for various protection functions such as timed off, over temperature, power off memory, overvoltage, undervoltage, overcurrent, over power, voltage imbalance, and current imbalance protection.
Key Features:
- Three-Phase Four-Wire Measurement
- Digital Watt-Hour Meter
- AC Voltage Range: 85-290V
- Current Range: 0-80A
- Power Range: 0-23KW
- Timing Range: Up to 999 hours
- Temperature Monitoring: -20~150 degrees Celsius
- Frequency Range: 50-60Hz
- Power Factor Measurement: 0.00-1.00PF
- Integrated Protection Functions: Timed off, Over Temperature, Power off memory, Overvoltage, Undervoltage, Overcurrent, Over power, Voltage imbalance, Current imbalance protection.
- Large LCD Color VA Display
4. Setup and Installation
The KWS-306 is designed for guide rail (DIN rail) mounting. Ensure the installation location is dry, well-ventilated, and free from excessive vibrations or electromagnetic interference.
4.1 Mounting
- Ensure all power to the circuit is disconnected at the main breaker.
- Snap the KWS-306 meter onto a standard 35mm DIN rail.
- Verify that the meter is securely fastened to the rail.
4.2 Wiring Connections
Refer to the wiring diagram below for correct connection of the three-phase four-wire system. The terminals are clearly labeled A, B, C for phases and N for neutral. Ensure proper phase sequence and secure connections to prevent arcing or malfunction.
Figure 2: Detailed view of the KWS-306 energy meter showing the input terminals for phases A, B, C, and Neutral (N), along with the internal wiring connections. This image illustrates how the meter integrates into a three-phase four-wire electrical system.
- Connect Phase A to terminal A.
- Connect Phase B to terminal B.
- Connect Phase C to terminal C.
- Connect Neutral to terminal N.
- Ensure all wires are correctly sized for the expected current load.
5. Operating Instructions
Once installed and powered on, the KWS-306 will automatically begin displaying real-time electrical parameters on its color LCD screen.
5.1 Display Navigation
The display shows various parameters such as voltage (V), current (A), power (KW), energy (Kwh), frequency (Hz), and temperature (°C). Use the navigation buttons (M, +, -, NO/OFF) on the side of the meter to cycle through different display modes or adjust settings.
- M Button: Typically used to switch between different display screens or enter/exit menu options.
- + / - Buttons: Used to adjust values or navigate within menus.
- NO/OFF Button: May function as an ON/OFF switch for certain features or to confirm selections.
5.2 Protection Functions
The KWS-306 includes several built-in protection features. When a protection event occurs, the meter may display an alert or automatically trip the circuit (if connected to a compatible circuit breaker system). Refer to the display indicators for specific protection status.
- Timed Off: Configurable timer for automatic power disconnection.
- Over Temperature Protection: Shuts down if internal temperature exceeds safe limits.
- Power Off Memory: Retains settings and accumulated data during power outages.
- Overvoltage Protection: Disconnects power if voltage exceeds a set threshold.
- Undervoltage Protection: Disconnects power if voltage drops below a set threshold.
- Overcurrent Protection: Disconnects power if current exceeds a set threshold.
- Over Power Protection: Disconnects power if total power consumption exceeds a set limit.
- Voltage Imbalance Protection: Monitors and protects against significant voltage differences between phases.
- Current Imbalance Protection: Monitors and protects against significant current differences between phases.
5.3 Mobile Phone Remote Control (KWS-306WF variant only)
For models with Wi-Fi functionality (e.g., KWS-306WF), the meter can be controlled and monitored remotely via a mobile application. This feature allows for unlimited distance control and real-time data access.
Figure 3: The KWS-306 energy meter shown in an environment with a smartphone displaying its remote control interface. This illustrates the capability for mobile phone remote control and monitoring, offering access to meter data and settings from any location.
Refer to the specific instructions provided with the mobile application for pairing and usage details. The base KWS-306 model does not include this feature.
6. Maintenance
The KWS-306 energy meter requires minimal maintenance. Regular checks can help ensure its longevity and accurate operation.
- Cleaning: Gently wipe the exterior of the meter with a soft, dry cloth. Do not use abrasive cleaners or solvents.
- Connection Checks: Periodically inspect wiring connections to ensure they remain tight and free from corrosion. (Perform only after disconnecting power.)
- Environmental Conditions: Ensure the operating environment remains within the specified temperature and humidity ranges.
7. Troubleshooting
If you encounter issues with your KWS-306 energy meter, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Meter display is blank. | No power supply; Loose wiring connection. | Check main power supply. Verify all wiring connections are secure. |
| Incorrect readings. | Incorrect wiring; Sensor malfunction. | Review wiring diagram and ensure correct connections. If problem persists, contact support. |
| Protection function trips frequently. | Actual overcurrent/overvoltage/etc.; Protection thresholds set too low. | Investigate the electrical load for actual faults. Adjust protection thresholds if necessary (refer to advanced settings in the full manual). |
| Mobile app not connecting (KWS-306WF). | Wi-Fi signal issue; Incorrect app settings; Meter not in pairing mode. | Ensure strong Wi-Fi signal. Recheck app settings and pairing procedure. |
If the issue is not resolved by the above steps, please contact QJWYO customer support for further assistance.
8. Specifications
Technical specifications for the QJWYO KWS-306 Three-Phase Four Wire Energy Meter:
| Parameter | Value |
|---|---|
| Model Number | KWS-306 |
| Brand | QJWYO |
| Power Supply | AC |
| Voltage Range | AC 85-290V |
| Current Range | 0-80A |
| Power Range | 0-23KW |
| Timing Range | 0-999 hours |
| Temperature Range | -20~150 degrees Celsius |
| Frequency Range | 50-60Hz |
| Power Factor | 0.00-1.00PF |
| Circuit Breaker Type | Standard |
| Mounting Type | Bolt-On Mount (Note: Product images and title suggest DIN rail mount, which is common for energy meters. This specification might refer to a general category or an alternative mounting method.) |
| Number Of Poles | 1 (Note: This specification appears to contradict the product's function as a three-phase four-wire meter. The device is designed for three-phase systems.) |
| Item Weight | 1.76 ounces |
| Package Dimensions | 0.39 x 0.39 x 0.39 inches |
Note: Specifications are subject to change without prior notice.
9. Warranty and Support
For warranty information, technical support, or service inquiries, please contact QJWYO customer service through your purchase platform or the official QJWYO website. Please have your product model number (KWS-306) and purchase date available when contacting support.