KStar EASTRON SDM630MCT 40mA - User Manual

SDM630MCT
40mA
DIN Rail Energy Meter for Three Phase
KSTAR Electrical Systems
www.kstar.comShenzhen KSTAR New Energy Company Limited
USER MANUAL V1.3
Measures kWh kVArh, kW, kVAr, kVA, P,
F, PF, Hz, dmd, V, A, THD,etc.
Bi-directional measurement IMP & EXP
Two pulse outputs
RS485 Modbus
Din rail mounting 35mm
40mA CT connection
Better than Class 1 / B accuracy

Summary

SDM630 MCT 40 mA Energy Meter Introduction

Zero Export Function for Three-Phase Inverters

Phase-Level Zero Export Method

Inverter output balanced by phase, limited by minimum phase power flow.

System-Level Zero Export Method

Inverter output balanced by total load, with phase-level injections or grid draw.

Meter and CT Installation & Wiring

Meter Installation on DIN Track

Instructions for releasing retaining clip and mounting the meter onto a DIN track.

CT Installation and Directionality

Guidance on installing current transformers (CTs) with correct directionality.

Wiring Connection Diagram

Detailed diagram showing grid, meter, and inverter connections, including RS485 and PE.

Inverter Settings for Zero Export

Navigating Inverter Menus

Explanation of buttons (A, B, C, D) for menu navigation and selection.

Setting Anti-Reverse Current

Steps to configure 'Anti Rev-l' (Enable/Disable, Meter Type, Anti Method).

Setting Amended Value

Instructions to set the 'Anti Amend' value for inverter output adjustment.

Overview

1. Function Description
2. Important Technical Specifications
3. Usage Features
4. Maintenance Features

The KSTAR SDM630MCT 40mA is a DIN Rail Energy Meter designed for three-phase KSTAR electrical systems, offering comprehensive energy monitoring and control capabilities. This device is crucial for implementing zero export functions in KSTAR three-phase inverter systems, ensuring compliance with grid regulations and optimizing energy consumption.

Function Description:

The primary function of the SDM630MCT 40mA is to accurately measure various electrical parameters in a three-phase system. It provides detailed data on energy consumption and generation, which is then used by KSTAR inverters to manage power flow. The meter supports two main methods for achieving zero export:

1. Phase-level zero export: In this method, the inverter's three-phase outputs are balanced based on the phase with the minimum power flowing through it. For example, if the loads on phases A, B, and C are 10kW, 20kW, and 30kW respectively, the inverter will limit its output to 10kW for each phase. Any additional power required by the higher-load phases will be drawn from the grid. This ensures that no power is injected back into the grid at the individual phase level.

2. System-level zero export: This method balances the inverter's three-phase outputs based on the total load of the system. If the loads on phases A, B, and C are 10kW, 20kW, and 30kW respectively, the inverter's limit power for each phase will be determined by the total load, for instance, 20kW per phase. In this scenario, phases requiring less than 20kW will inject power into the grid, while phases requiring more than 20kW will draw power from the grid to meet their demand. This approach aims for overall system balance regarding grid interaction.

The meter's data-driven decisions enable the inverter to control its output effectively, preventing unwanted power export and optimizing self-consumption.

Important Technical Specifications:

• Measurement Parameters: The SDM630MCT measures a wide range of electrical parameters, including:
  • kWh (kilowatt-hour)
  • kVArh (kilovolt-ampere reactive hour)
  • kW (kilowatt)
  • kVAr (kilovolt-ampere reactive)
  • kVA (kilovolt-ampere)
  • P (power)
  • F (frequency)
  • PF (power factor)
  • Hz (Hertz)
  • dmd (demand)
  • V (voltage)
  • A (current)
  • THD (Total Harmonic Distortion), etc.
• Bi-directional Measurement: It supports both import (IMP) and export (EXP) measurements, providing a complete picture of energy flow.
• Pulse Outputs: The device features two pulse outputs, which can be used for external monitoring or control systems.
• Communication: Equipped with RS485 Modbus, allowing for remote communication and integration with building management systems or energy monitoring platforms.
• Mounting: Designed for 35mm DIN rail mounting, ensuring easy installation in standard electrical enclosures.
• CT Connection: Specifically designed for a 40mA CT (Current Transformer) connection, which is crucial for accurate current measurement.
• Accuracy: Offers better than Class 1 / B accuracy, ensuring reliable and precise measurements for critical energy management applications.

Usage Features:

• Easy Installation: The meter is designed for straightforward installation on a DIN rail. The process involves pulling a retaining clip to release, mounting the meter, and pushing the clip up until a click sound confirms secure installation.
• CT Directionality: Proper CT installation is critical. The current flow must be consistent with the arrow direction on the CT, indicating flow from the grid to the inverter. The CT is then buckled in the direction of this arrow.
• Inverter-based Configuration: All settings for the meter, including meter mode and zero export function, are configured directly through the KSTAR inverter interface. This eliminates the need for direct interaction with the meter's physical interface for complex configurations.
• User-friendly Inverter Interface: The inverter's interface utilizes a simple navigation system with 'Return', 'Up', 'Down', and 'ENTER' buttons for menu selection and value adjustment.
• Password Protection: Access to setup functions on the inverter is protected by a password ("00000"), ensuring secure configuration.
• Zero Export Method Selection: Users can choose between "SinglePhase" (phase-level zero export) and "R-S-T Sum" (system-level zero export) methods via the inverter settings, allowing flexibility based on specific grid requirements and energy management strategies.
• Meter Type Selection: The inverter settings allow for the selection of the correct meter type (e.g., "Acrel" or "Estron") to ensure compatibility and accurate data interpretation. This setting is typically printed on the meter itself.
• Amended Value Setting: The inverter interface allows users to set an "Amended value" in Watts, providing fine-tuned control over the inverter's output for zero export.

Maintenance Features:

• Wiring Connection Guidelines: The manual provides clear wiring diagrams for connecting the meter to the grid, CTs, and the inverter. This includes specific connections for N (Neutral), L1, L2, L3 (Phases), RS485 A/B, and SO (Pulse Output).
• Critical Connection Warning: Emphasizes the importance of ensuring that the CT and corresponding supply cable are connected to the same phase. A warning is provided that incorrect connection or direction can lead to inaccurate data and potential damage to the meter.
• System Integration: The RS485 Modbus communication allows for remote monitoring and diagnostics, which can aid in troubleshooting and maintenance without direct physical access to the meter.
• Robust Design: As a DIN rail mountable device, it is designed for installation within electrical panels, offering protection from environmental factors and contributing to its longevity.

KStar EASTRON SDM630MCT 40mA Specifications