Hoymiles DTSU666 User manual

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Three-phase Smart Meter
USER MANUAL
DTSU666 (CT-3 × 100 A)

© 2023 Hoymiles Power Electronics Inc. All rights reserved. 2
Smart Meter User Manual
1 Safety Instruction 3
1.1 Safety Symbols 3
1.2 Personnel Requirements 4
1.3 Product-related Requirements 4
1.4 Disclaimer 4
1.5 Maintenance and Replacement 4
2 Product Introduction 5
2.1 Product Overview 5
2.2 Product Naming Rule 5
2.3 Working Principle 6
2.3.1 Working Principle Diagram 6
2.3.2 Metering Part Principle 6
2.3.3 Data Processing Part Principle 6
2.4 Main Function 7
2.4.1 Display function 7
2.4.2 Programming Function 9
2.4.2.1 Programming Parameter 9
2.4.2.2 Programming Operation 9
2.4.3 Communication Function 10
2.4.4 Energy Measurement Function 10
2.5 Product Dimensions 11
2.6 Product Installation 12
2.7 Typical Wiring 13
3 Troubleshooting 14
4 Technical Specication 15
4.1 Limit of error caused by the current augment 15
4.2 Start 16
4.3 Deuction 16
4.4 Environmental Parameter 16
4.5 Electrical Parameter 16
4.6 Technical Parameter 17
CONTENTS

© 2023 Hoymiles Power Electronics Inc. All rights reserved. 3
Smart Meter User Manual
1 Safety Instruction
1.1 Safety Symbols
The following types of safety precautions and general information symbols used in this manual must be
followed during the installation, operation, and maintenance.
Symbol Usage
Indicates a hazard with a high level of risk that, if not avoided, will result in death or
serious injury.
Indicates a hazard with a medium level of risk that, if not avoided, can result in death or
serious injury.
Indicates a hazard with a low level of risk that, if not avoided, can result in minor or
moderate injury.
Indicates a situation that, if not avoided, can result in property damage.
NOTICE is used to address practices not related to personal injury.
Caution! Failure to observe any warnings contained in this manual may result in injury.
Danger to life due to high voltages!
Only qualified personnel can open and maintain the inverter.
Burn danger due to hot surface that may exceed 60℃.
Refer to the operating instructions.
Products shall not be disposed of as household waste.
DANGER
CAUTION
NOTICE
WARNING

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Smart Meter User Manual
1.2 Personnel Requirements
This document is only applicable to qualified personnel who have received professional training and
possess the following skills:
• Knowledge of and compliance with this document and all safety instructions.
• Familiar with all safety specifications of the electrical system.
• Understanding of the composition and working principles of the grid-tied PV power system and local
regulations.
• Proficiency in energy meter installation, operation, and maintenance.
Note:
• The qualified personnel must wear personal protective equipment (PPE) during all operations.
• The qualified personnel should comply with local laws and regulations during installation and
operation. The safety instructions in this document are only supplements to laws and regulations.
1.3 Product-related Requirements
• When transporting and unpacking the products, please confirm they are not severely impacted.
• The package of the meter should use materials that can meet environmental requirements.
• The instrument and accessories shall be stored in dry and ventilated places, to avoid humidity and
corrosive gas erosion. The storage environment temperature is -40℃ to 70℃, and the relative humidity
should be no more than 75%.
• Transport and store the product based on transportation, basic environmental conditions, and testing
methods for instruments and meters of JB/T9329-1999.
1.4 Disclaimer
Hoymiles shall not be liable for the following situations:
• Any damage caused by incorrect installation and operation.
• Any damage caused by improper transportation and storage.
• Any damage caused by unauthorized modifications to the product.
• Any installation, operation, and maintenance performed by unqualified personnel.
• Failure to comply with all safety and operation instructions described in this document.
1.5 Maintenance and Replacement
• Disconnect the power supply before any maintenance and repair operation.
• All maintenance and replacement operations must be performed by qualified personnel.
• It is recommended to carry out regular inspection and maintenance for safety reasons.
• If users find any quality problem within 18 months from the date of dispatch, Hoymiles is responsible
for repairing or replacing it for free, on the condition that users operate the product according to the
manual’s provision, and the seal is intact.

© 2023 Hoymiles Power Electronics Inc. All rights reserved. 5
Smart Meter User Manual
2 Product Introduction
2.1 Product Overview
Type DTSU666 three-phase smart meter (Din-rail) (hereinafter referred to as the “instrument”) adopts
a large-scale integrated circuit and applies digital sampling technology. It is designed based on power
monitoring and energy metering demands for electric power system, communication industry,
construction industry, etc, as a new generation of intelligent instruments combining measurement and
communication functions, mainly applied to the measurement and display for the electric parameters in
the electric circuit including three voltage, three current, active power, reactive power, frequency, positive
and negative energy, four quadrant energy, etc. Adopting the standard DIN35 mm din rail mounting and
modular design, it is characterized by small volume, easy installation, and networking, widely applied to
the internal energy monitoring and assessment for industrial and mining enterprises, hotels, schools, and
large public buildings.
This type of energy meter conforms to the following standards:
• IEC 61010-1:2010
《Safety requirements for electrical requirement for measurement, control, and
laboratory use Part1: General requirements》 ;
• IEC 61326-1:2013
《Electrical requirement for measurement, control, and laboratory use-EMC
requirements Part1: General requirements》 ;
• MODUS-RTU protocol.
2.2 Product Naming Rule
Model Accuracy Grade Referenced
Voltage
Current
Specication Constant Type
DTSU666
(CT-3 × 100 A) Active Power 1 3 × 230 V/400 V 100 A/40 mA 400 imp/kWh Transformer Access
D D/T/S S U 666
Design Number
DIN Rail
Electronic Type
Connection Mode:
D: Single phase AC Energy Meter
T: Three phase four wire AC Energy Meter
S: Three phase three wire AC Energy Meter
Energy Meter
Figure 2-1 Product Naming Rule
Table 2-1 Model Specication

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Smart Meter User Manual
2.3 Working Principle
2.3.1 Working Principle Diagram
The instrument is composed of a highly accurate metering integrated circuit (ASIC), management MCU,
memory chip, RS485 communication module, etc.
The working principle block diagram of the instrument is shown in Figure 2-2:
2.3.2 Metering Part Principle
The special metering integrated circuit (ASIC) integrated six loads in two orders ∑-△a type of A/D
conversion, please take the digital signal processing measured by the voltage circuit as well as all the
power, energy, effective values, power factor, and frequency. This metering chip can measure the active
power, reactive power, apparent power, active energy, reactive power, and apparent energy of each phase
and combined phase, and at the same time, measure current, voltage effective values, power factor,
phase angle, frequency, and other parameters, entirely satisfying the needs of the power meter. The chip
provides an SPI interface, convenient for metering parameters as well as parameter calibration between
the management MCU.
2.3.3 Data Processing Part Principle
Management MCU will timely read the electrical parameters such as current, voltage, power, etc. in the
metering chips, judging the current quadrant based on the read data, and judging the current operated
rate based on time and time rate, then adding the energy read from the metering chip to the corresponding
quadrant energy and total energy based on the rate and quadrant, at the same time, calculating the
corresponding combined energy based on the energy combination mode, and then store and backup the
energy.
Current
Sampling
Voltage
Sampling
Metering
ASIC MCU
LCD Display
Memory
Key Stroke
RS485 Interface
Real-time Clock
Impulse Output
Power
Management
Power Supply
Ia
Ib
Ic
Ua
Ub
Uc
Figure 2-2 Working Principle Diagram

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Smart Meter User Manual
2.4 Main Function
2.4.1 Display function
From the displayed interface, the electrical parameter and energy data are all primary side data (that is, the
multiplied by current and voltage ratios). The energy measuring value will be displayed in seven bits, with
the display range from 0.00 kWh to 999999.9 kWh.
No. Display Interface Description
1 Combined active energy=10000.00 kWh
2 Positive active energy=10000.00 kWh
3 Reserve active energy=2345.67 kWh
4
Protocol: Modbus-RTU;
address =001
Baud rate=9600 bps
None parity, 1 stop bits
5
6 Phase A voltage=220.0 V
7 Phase B voltage=220.1 V
8 Phase C voltage=220.2 V
Figure 2-3 Liquid Crystal Display
Table 2-2 Display Interface

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Smart Meter User Manual
9 Phase A current=5.000 A
10 Phase B current=5.001 A
11 Phase C current=5.002 A
12 Combined phase active power=3.291 kW
13 Phase A active power=1.090 kW
14 Phase B active power=1.101 kW
15 Phase C active power=1.100 kW
16 Combined phase power factor PFt=0.500
17 Phase A power factor PFa=1.000
18 Phase B power factor PFb=0.500
19 Phase C power factorPFc=0.500
Note:
Combined active energy=Positive active energy + Reserve active energy
The communication address of Modbus protocol is 1 terminal data (1-247), and the factory default baud
rate is 9600 bps, N.8.1; E1 means even check 1 stop bit, O1 means odd check 1 stop bit, and N1 means one
stop bit without check.
The above interface is used to show the meaning of the display content. Due to the different functions of
the instrument, the display symbols will increase or decrease.

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Smart Meter User Manual
2.4.2 Programming Function
2.4.2.1 Programming Parameter
Parameter Value Range Description
1-9999
Current ratio, used for setting the input loop current ratio:
When the current is connected to the line via the transformer, Ct=the rated
current of the primary loop / the rated current of the secondary circuit;
When the current is directly connected to the line, Ct shall be set as 1.
0.1-999.9
Voltage ratio, used for setting the voltage ratio of the input loop;
When the voltage is connected to the line via the transformer, Pt= the rated
voltage of the primary loop / the rated voltage of the secondary circuit;
When the voltage is directly connected to the line, Pt shall be set as 1.0.
1-5
Settings for communication stop bit and parity bits:
1: 645 mode; 2: None parity, 2 stop bits, n.2; 3. None parity, 1 stop bit, n.1;
4: Even parity, 1 stop bit, E.1; 5: Odd parity, 1 stop bit, O.1
0: 1200
1: 2400
2: 4800
3: 9600
4: 19200
Communication baud rate:
0: 1200 bps; 1: 2400 bps; 2: 4800 bps; 3: 9600 bps;
4: 19200 bps (customization)
1-247 Communication address
0: n.34
1: n.33
Option for wiring mode:
0: n.34 represents three-phase four wire;
1: n.33 represents three-phase three wire.
0: P
1: Q
2: S
Pulse output:
0: active energy pulse; 1: reactive energy pulse; 2: others
0-30 Display in turns (second)
0: Timely display; 1-30: Time interval of actual display
0-30 Backlight lighting time control (minutes)
0: Normally light; 1-30: Backlight lighting time without button operation
2.4.2.2 Programming Operation
Button description: The “SET” button represents “confirmation” or “cursor shift” (when input digits); the
“ESC” button represents “exit”; the “→” (“ ”) button represents “add”. The input code is (default 701).
Table 2-3 Programming Parameter
Figure 2-4 Setting examples for communication address and baud rate

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Smart Meter User Manual
When input digits, “ ” can be used as a cursor shift button; “ ” is “add” button, “ ” means exiting the
programming operation interface or switching to the character interface from the digit modication interface;
adding from the beginning after setting the digit to the maximum value.
Note:
The communication address can also be set through the S-Miles App. Open the S-Miles App, tap “Toolkit
→Meter Location”, and enter the serial number of the smart meter, the communication address will be
automatically set to 002. If two meters are required for an AC-coupled system, the address of the grid side
meter should be set to 002, and the address of the PV side meter should be set to 001.
2.4.3 Communication Function
It has an RS485 communication interface, and the baud rate can be changed between 1200 bps, 2400 bps,
4800 bps, and 9600 bps.
The factory default communication parameter is Modbus-RTU protocol; the baud rate is 9600 bps, with the
calibration bit and stop bit to be n.1, and the instrument address is 1.
2.4.4 Energy Measurement Function
The horizontal axis of the measurement plane represents the current vector I (fixed on the horizontal axis),
and the instantaneous voltage vector is used to represent the current power transmission. Compared with
the current vector I, it has phase angleφ. The counter-clockwise direction φangle is positive.
Note:
1. The measurement method for the combined active energy depends on the contents of character words
of the active combined mode.
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Reserved Reserved Reserved Reserved
Reverse
active (0
no less, 1
less)
Reverse
active (0
not added,
1 added)
Positive
active (0
no less, 1
less)
Positive
active (0
not added,
1 added)
Example:
when the content of the active combination mode is 05,
combined active energy=positive active energy +reverse active energy
factory default value: combined active energy=positive energy
+-
+
-
I
Output active power
Input reactive power
Output reactive power
P
Q
S
III
III IV
φ
Output reactive power
Output reactive power
Output reactive power
Figure 2-5 Measurement schematic diagram for energy four quadrants
Table 2-4 Character words of active combined mode