Introduction
This manual provides essential information for the safe and efficient installation, operation, and maintenance of the Schneider Electric EM6438H Dual Power & Energy Meter. The EM6438H is designed for accurate measurement of power and energy parameters from both utility (EB) and generator (DG) sources, featuring an accuracy class of 1.0 and RS485 communication capability.
Safety Information
Always observe standard safety precautions during installation, operation, and maintenance. This device should only be installed and serviced by qualified personnel. Disconnect all power before working on the meter or its connections. Failure to follow these instructions can result in serious injury or death.
- Ensure power is disconnected before installation or maintenance.
- Use appropriate personal protective equipment (PPE).
- Verify all connections are secure and correct before applying power.
- Do not use the meter for primary overcurrent protection.
Setup and Installation
The EM6438H meter is designed for flush mounting. Proper panel cutout and secure mounting are crucial for reliable operation.
Mechanical Installation
Prepare the panel cutout according to the specified dimensions. The meter is secured using retainer clips.
Figure 1: Flush Mounting Diagram. This image illustrates the flush mounting process for the meter. It shows the meter being inserted into a rectangular panel cutout. The cutout dimensions are indicated as 92.0 +0.8/-0.03 mm (3.62 inches) for both height and width, with a panel thickness of less than 6.4 mm (0.25 inches).
Figure 2: Mechanical Dimensions. This diagram provides the detailed mechanical dimensions of the EM6438H meter in millimeters and inches. Key dimensions include a front panel size of 96.0 mm (3.78 inches) by 96.0 mm (3.78 inches), and a depth of approximately 110.1 mm (4.33 inches) from the front panel to the rear of the terminals.
Electrical Connections
Refer to the wiring diagram (not provided in this manual, consult product documentation) for specific connection details. Ensure correct polarity and secure termination for all wires.
- Input Voltage Terminals (V1, V2, V3, VN): Connect the phase and neutral voltage inputs.
- Input Current Terminals (A1(S1, S2), A2(S1, S2), A3(S1, S2)): Connect the current transformer (CT) secondary wires.
- Auxiliary Power Supply (L+, N-): Provide the necessary control power to the meter.
- RS485 Communications (D1+, D0-): Connect for Modbus RTU communication.
Operation
The EM6438H features an intuitive display and navigation keys for accessing various parameters and settings.
Display Overview and Navigation
Figure 3: Display Overview and Controls. This image details the front panel of the meter, showing the LCD display, LED indicators, and navigation buttons. It labels various display elements such as phase measurements (A), demand measurements (B), RTC (C), negative indicator (D), navigation keys (E, F), OK key (G), energy pulsing LED (H), and x1000 indicator (J). It also shows the physical location of input current terminals (M), RS-485 terminals (N), protective cover (P), auxiliary power supply (Q), and input voltage terminals (R).
- Navigation Keys (Up/Down): Used to scroll through different measurement screens and menu options.
- OK Key: Used to confirm selections or enter sub-menus.
- Energy Pulsing LED (Red/Green): Indicates active energy (red) and reactive energy (green) pulses, or communication activity.
- Password Protection: The meter includes password protection for configuration settings.
Key Parameters Displayed
The EM6438H can display a wide range of electrical parameters, including:
- Phase Measurements: Voltage (Vl-N, Vl-L), Current (I), Power (kW, kVA, kVAR), Power Factor (PF), Total Harmonic Distortion (VTHD, ITHD).
- Demand Measurements: Demand (DM), Predicted Demand (PrdDM), Maximum Demand (MD).
- Energy Readings: Apparent energy, Active energy, Reactive energy (kWh, kVAh, kVARh).
- System Measurements: Average voltage (Vavg), average current (Iavg), frequency (F), run hours (Runhrs), on hours (OnHrs).
- Real-Time Clock (RTC): Displays date and time.
The meter supports monitoring of parameters from both EB (Electricity Board/Utility) and DG (Diesel Generator) sides, providing comprehensive dual-source energy management.
Maintenance
The EM6438H meter is designed for minimal maintenance. Regular inspection and cleaning are recommended to ensure optimal performance.
- Cleaning: Use a soft, dry cloth to clean the display and casing. Do not use abrasive cleaners or solvents.
- Inspection: Periodically check all electrical connections for tightness and signs of wear or damage.
- Firmware Updates: Consult Schneider Electric support for information on available firmware updates.
Troubleshooting
If the meter is not functioning as expected, consider the following basic troubleshooting steps:
- No Display/Power: Verify that the auxiliary power supply is correctly connected and energized. Check fuses or circuit breakers in the power supply circuit.
- Incorrect Readings: Ensure all voltage and current transformer (CT) connections are correct and that CT ratios are properly configured in the meter settings. Check for loose wiring.
- Communication Issues (RS485): Verify RS485 wiring (D1+, D0-), baud rate, parity, and slave ID settings. Ensure the communication cable is not damaged.
- Meter Not Responding: Try cycling the auxiliary power to the meter. If the issue persists, contact technical support.
Specifications
| Feature | Detail |
|---|---|
| Brand | Schneider Electric |
| Model Number | EM6438H |
| Accuracy Class | 1.0 |
| Communication | RS485 (Modbus RTU) |
| Special Features | Dual Source Energy Meter, EB & DG side Power & Energy parameters, Runhrs, OnHrs, Optional Demand parameters, Password protection |
| Item Weight | 380 g |
| Product Dimensions (LxWxH) | 18 x 5 x 5 cm (7.09 x 1.97 x 1.97 inches) |
| Mounting Type | Flush Mounting |
| Included Components | 1 unit (meter) |
Parameter Support Overview
The EM6438H supports a comprehensive set of parameters. The following table provides a general overview of parameters typically supported by EM6400 series meters, including the EM6438H.
Figure 4: EM6400 Series Parameter Support. This table illustrates the various parameters supported across different models within the EM6400 series. For the EM6438H (which is part of the EM6400 series, specifically EM6400 column in the image), it indicates support for parameters such as V, I, F, % Load, PF, THD, Demand (DM, MD), Wh, VAh, VARh, Run hours, and On hours. A solid dot (•) indicates a standard feature, while "I/E" indicates import/export functionality.
Warranty Information
Warranty does not apply for defects resulting from unauthorized modification, misuse, or use for any reason other than electrical power monitoring. This product is not intended for primary overcurrent protection; any protection feature is for alarm or secondary protection only.
This warranty is in lieu of all other warranties, expressed or implied, including any implied warranty of merchantability or fitness for a particular purpose. Schneider Electric or its resellers shall not be liable for any penal, indirect, special, or consequential damages arising from any authorized or unauthorized use of any Schneider Electric product. Liability shall be limited to the original cost of the product sold.
Customer Support
For technical assistance, service, or further information, please contact Schneider Electric customer support. Visit the official Schneider Electric website for contact details and additional resources.
Schneider Electric Official Website: www.se.com