Hoymiles DDSU666 User Manual (English)

Questions and Answers:

M
michaeldanielsAug 7, 2025
Why is the energy metering inaccurate on my Hoymiles DDSU666 Measuring Instruments?
- M
  Michael GentryAug 7, 2025
  If you're experiencing inaccurate energy metering with your Hoymiles Measuring Instruments, first ensure that the wiring is correct and the phase sequence for voltage and current match. Refer to the wiring diagram for correct connections. Also, check the current transformer inlet to see if the high-end and low-end are reversely connected. Note that if the power values Pa, Pb, and Pc are abnormal and show negative values, this could also be the cause.
M
margaretwilcoxAug 16, 2025
What to do if there is abnormal RS485 communication with Hoymiles DDSU666 Measuring Instruments?
- J
  Joel MorrisAug 16, 2025
  If you are experiencing abnormal RS485 communication with your Hoymiles Measuring Instruments, check the RS485 communication cable for disconnections, short circuits, or reversed connections; reconnect or replace the cable if necessary. Also, verify that the address, baud rate, data bit, and parity bit of the instrument match those of the host computer. Adjust these settings via the buttons, referring to the "parameter setting" for guidance.
M
meyersluisAug 27, 2025
How to fix no display on Hoymiles Measuring Instruments after power on?
- E
  Eileen SextonAug 27, 2025
  If your Hoymiles Measuring Instruments show no display after powering on, it could be due to incorrect wiring. Double-check and reconnect based on the correct wiring diagram. It may also be caused by abnormal voltage supplied to the instrument. Ensure the voltage supply matches the instrument's specifications.

Hoymiles DDSU666 Specifications

General

Brand	Hoymiles
Model	DDSU666
Category	Measuring Instruments
Language	English

Summary

Safety Instructions

Safety Symbols

Details various safety symbols and their meanings to ensure safe operation.

Personnel Requirements

Specifies the qualifications and PPE required for personnel handling the meter.

Product-related Requirements

Outlines requirements for product handling, storage, and transportation environments.

Disclaimer

States liabilities concerning installation, operation, modifications, and unqualified personnel.

Maintenance and Replacement

Provides guidelines for maintenance, repair, and warranty conditions for the meter.

Product Introduction

Product Overview

Introduces the DDSU666 smart meter, its design, applications, and relevant standards.

Product Naming Rule

Explains the naming convention for the DDSU666 model, detailing each component's meaning.

Working Principle

Presents a block diagram illustrating the working principle of the smart meter.

Main Function

Accurately metering positive/reverse active energy, combined active energy, and data storage. LCD displays electrical parameters and energy data.

Product Dimensions

Provides detailed physical dimensions for the DDSU666 meter and its installation.

Product Installation

Details the installation procedure for hybrid and AC-coupled systems, including safety precautions.

Troubleshooting

Fault Phenomenon

Details common faults like no display, abnormal RS485 communication, and inaccurate energy metering.

Technical Specification

Percentage Error

Specifies the permissible percentage error limits for the single-phase electric meter under various conditions.

Start

Defines the conditions under which the electric meter starts and continuously measures electric energy.

Defluction

Describes the meter's output pulse behavior when voltage is applied without current.

Environmental Parameter

Lists the operating temperature range, humidity, and atmospheric pressure specifications.

Electrical Parameter

Details specified, extended, and limiting operating voltage ranges and power consumption.

Technical Parameter

Summarizes technical parameters including power supply, measuring range, accuracy, and communication.

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Table of Contents