Hoymiles Three-phase Smart Meter DTSU666 (CT-3 × 100 A) USER MANUAL
Brand: Hoymiles
Model: DTSU666 (CT-3 × 100 A)
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 |
|---|---|
| ⚠️ DANGER | Indicates a hazard with a high level of risk that, if not avoided, will result in death or serious injury. |
| ❗ WARNING | Indicates a hazard with a medium level of risk that, if not avoided, can result in death or serious injury. |
| ⚠️ CAUTION | Indicates a hazard with a low level of risk that, if not avoided, can result in minor or moderate injury. |
| ℹ️ NOTICE | 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°C. |
| ℹ️ | Refer to the operating instructions. |
| ?️❌ | Products shall not be disposed of as household waste. |
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.
- Familiarity 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°C to 70°C, 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.
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
The product naming convention follows a structure that indicates its specifications:
- D/T/S: Indicates the connection mode (D: Single phase AC Energy Meter, T: Three phase four wire AC Energy Meter, S: Three phase three wire AC Energy Meter).
- SU 666: Design Number, DIN Rail, Electronic Type, Energy Meter.
Table 2-1 Model Specification
| Model | Accuracy Grade | Referenced Voltage | Current Specification | Constant | Type |
|---|---|---|---|---|---|
| DTSU666 (CT-3 × 100 A) | Active Power 1 | 3 × 230 V/400 V | 100 A/40 mA | 400 imp/kWh | Transformer Access |
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 shows the flow from current and voltage sampling, processed by the Metering ASIC, which communicates with the Management MCU. The MCU interacts with components like the LCD Display, Memory, Key Stroke, RS485 Interface, Real-time Clock, and Impulse Output, all powered by the Power Supply and Power Management unit.
2.3.2 Metering Part Principle
The metering integrated circuit (ASIC) uses A/D conversion to process digital signals from the voltage circuit. It measures active power, reactive power, apparent power, active energy, reactive energy, and apparent energy for each phase and combined phase. It also measures current, voltage effective values, power factor, phase angle, and frequency, providing an SPI interface for parameter calibration with the management MCU.
2.3.3 Data Processing Part Principle
The Management MCU reads electrical parameters from the metering chips. It determines the current quadrant based on the data and calculates the operating rate based on time. Energy readings are added to corresponding quadrant and total energy values. It also calculates combined energy based on the energy combination mode and stores this data.
2.4 Main Function
2.4.1 Display function
The displayed interface shows primary side electrical parameters and energy data. The energy measuring value is displayed in seven bits, with a range from 0.00 kWh to 999999.9 kWh.
Liquid Crystal Display Example: Shows digits and symbols representing various measurements.
Table 2-2 Display Interface
| No. | Display Interface | Description |
|---|---|---|
| 1 | 10000.00 kWh | Combined active energy=10000.00 kWh |
| 2 | 10000.00 kWh | Positive active energy=10000.00 kWh |
| 3 | 2345.67 kWh | Reserve active energy=2345.67 kWh |
| 4 | n1-9.600 | Protocol: Modbus-RTU; address =001; Baud rate=9600 bps; None parity, 1 stop bits |
| 5 | ----001 | |
| 6 | UA 220.0 V | Phase A voltage=220.0 V |
| 7 | UB 220.1 V | Phase B voltage=220.1 V |
| 8 | UC 220.2 V | Phase C voltage=220.2 V |
| 9 | IA 5.000 A | Phase A current=5.000 A |
| 10 | IB 5.001 A | Phase B current=5.001 A |
| 11 | IC 5.002 A | Phase C current=5.002 A |
| 12 | P_t 3.291 kW | Combined phase active power=3.291 kW |
| 13 | P_A 1.090 kW | Phase A active power=1.090 kW |
| 14 | P_B 1.101 kW | Phase B active power=1.101 kW |
| 15 | P_C 1.100 kW | Phase C active power=1.100 kW |
| 16 | PF_t 0.500 | Combined phase power factor PFt=0.500 |
| 17 | PF_A 1.000 | Phase A power factor PFa=1.000 |
| 18 | PF_B 0.500 | Phase B power factor PFb=0.500 |
| 19 | PF_C -0.500 | Phase C power factor PFc=0.500 |
Note: Combined active energy = Positive active energy + Reserve active energy. The communication address of Modbus protocol is 1-247, and the factory default baud rate is 9600 bps, N.8.1. The display symbols may vary based on the instrument's functions.
2.4.2 Programming Function
2.4.2.1 Programming Parameter
Table 2-3 Programming Parameter
| Parameter | Value Range | Description |
|---|---|---|
| Ct | 1-9999 | Current ratio, used for setting the input loop current ratio. For transformer connection, Ct = rated current of primary loop / rated current of secondary circuit. For direct connection, Ct = 1. |
| Pt | 0.1-999.9 | Voltage ratio, used for setting the input loop voltage ratio. For transformer connection, Pt = rated voltage of primary loop / rated voltage of secondary circuit. For direct connection, Pt = 1.0. |
| Prot | 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 |
| bAud | 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) |
| Addr | 1-247 | Communication address |
| nEt | 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. |
| PLUS | 0: P, 1: Q, 2: S | Pulse output: 0: active energy pulse; 1: reactive energy pulse; 2: others |
| d1SP | 0-30 | Display in turns (second): 0: Timely display; 1-30: Time interval of actual display |
| bLCD | 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 is for confirmation or cursor shift. The “ESC” button exits the setting interface. The “→” button adds values. The input code is (default 701).
The process involves powering on, pressing SET to enter the setting interface, using SET to shift between digits, and the “→” button to add values. ESC exits the interface. Examples show setting communication address and baud rate.
2.4.3 Communication Function
The meter features an RS485 communication interface with selectable baud rates (1200, 2400, 4800, 9600 bps). The factory default is Modbus-RTU protocol with a baud rate of 9600 bps, N.1 parity and stop bits, and an instrument address of 1.
Note: The communication address can also be set via the S-Miles App. For AC-coupled systems with two meters, the grid side meter should be set to 002 and the PV side meter to 001.
2.4.4 Energy Measurement Function
The measurement plane uses the current vector as the horizontal axis. The phase angle difference between voltage and current determines power transmission. Counter-clockwise direction is positive.
Figure 2-5 Measurement schematic diagram for energy four quadrants: Illustrates the concept of active and reactive power measurement across four quadrants.
Note: The measurement method for combined active energy depends on the active combined mode settings.
Table 2-4 Character words of 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: If the active combination mode is 05, combined active energy = positive active energy + reverse active energy. Factory default: combined active energy = positive energy.
The combined reactive energy of four quadrants can be measured and set as a sum of arbitrarily four-quadrant energy, depending on character words 1 and 2 of the reactive combination mode.
Table 2-5 Character words of the combined reactive combination mode
| Bit 7 | Bit 6 | Bit 5 | Bit 4 | Bit 3 | Bit 2 | Bit 1 | Bit 0 |
|---|---|---|---|---|---|---|---|
| IV quadrant (0 no less, 1 less) | IV quadrant (0 not added, 1 added) | III quadrant (0 no less, 1 less) | III quadrant (0 not added, 1 added) | II quadrant (0 no less, 1 less) | II quadrant (0 not added, 1 added) | I quadrant (0 no less, 1 less) | I quadrant (0 not added, 1 added) |
Explanation of bits: 0 bit: I quadrant reactive; 1-Counted into combined reactive. First bit: I quadrant reactive; 1-Minus the quadrant reactive. Second bit: II quadrant reactive; 1-Counted into combined reactive. Third bit: II quadrant reactive; 1-Minus the quadrant reactive. Fourth bit: III quadrant reactive; 1-Counted into combined reactive. Fifth bit: III quadrant reactive; 1-Minus the quadrant reactive. Sixth bit: IV quadrant reactive; 1-Counted into combined reactive. Seventh bit: IV quadrant reactive; 1-Minus the quadrant reactive.
Example: For reactive combination mode A5, Combined reactive energy = I quadrant reactive + II quadrant reactive - III quadrant reactive - IV quadrant reactive. Factory default: combined reactive 1 energy=I + IV, combined reactive 2 energy=II + III.
2.5 Product Dimensions
Table 2-6 Product Structure
| Model | Modulus | Outline Size (W × H × D) | Installation Size (Din-rail) |
|---|---|---|---|
| DTSU666 (CT-3 × 100 A) | 4 | 72 × 100 × 65 mm | DIN35 standard din-rail |
Figure 2-6 Product Dimensions: Shows the physical dimensions of the meter, approximately 72mm width, 100mm height, and 65mm depth, designed for DIN35 standard din-rail mounting.
Figure 2-7 Current cable terminal: Depicts a terminal for current cables with a conductor cross-sectional area up to 16 mm².
Figure 2-8 RS485 cable terminal: Shows a terminal for RS485 cables with a conductor cross-sectional area of 0.25 mm²-1 mm².
Note: The undeclared tolerance is ±1 mm. The dimensions provided are indicative; shapes may differ slightly for different specifications.
2.6 Product Installation
⚠️ DANGER: Before connecting cables, ensure the smart meter is undamaged to prevent electric shocks or fires.
ℹ️ NOTICE:
- Before installation, verify the model and specifications on the box match the product. Contact the supplier if discrepancies exist.
- Check the packing case for damage. Contact the supplier if damaged.
- If the carton shows signs of severe impact or falling during unpacking, contact the supplier immediately.
- After removing from the packing box, place the instrument on a flat, safe surface, facing up. Do not stack more than five layers. Do not install if the inner package or shell is damaged.
Figure 2-9 Meter Installation: Illustrates the meter being clipped onto a guide rail.
Procedure (Hybrid System)
- Clamp the meter to the guide rail directly, and install it in or near the distribution box, adjacent to the utility meter.
- Connect grid L1/L2/L3/N to meter's terminals 3/6/9/10 respectively.
- Clamp three CTs to L1/L2/L3 and connect their wirings to terminals 13/14, 16/17, and 19/21. Ensure the arrow on the CT surface points towards the grid.
- Connect the communication cable between the inverter and the smart meter.
Procedure (AC-coupled System)
- Smart meter 1 connects to the grid port, and smart meter 2 connects to the GEN port. The connection method is the same as described above.
Note: When installing, clip the end of the card slot into the guide rail. When disassembling, use a screwdriver to press the card to remove the instrument.
2.7 Typical Wiring
⚠️ DANGER: High voltage can cause electric shock, leading to serious injury, death, or property damage. Strictly comply with safety instructions.
Figure 2-10 Type of Wiring 3P4W: Shows the wiring diagram for a three-phase, four-wire system.
Figure 2-11 RS485: Depicts the RS485 communication wiring.
Voltage signal
- 3: UA (Phase A voltage input terminal)
- 6: UB (Phase B voltage input terminal)
- 9: UC (Phase C voltage input terminal)
- 10: UN (Phase N voltage input terminal)
Current signal
- 13: IA* (Phase A current input terminal)
- 16: IB* (Phase B current input terminal)
- 19: IC* (Phase C current input terminal)
- 14: IA (Phase A current output terminal)
- 17: IB (Phase B current output terminal)
- 21: IC (Phase C current output terminal)
RS485 communication
- 24: A (RS485 terminal A)
- 25: B (RS485 Terminal B)
3 Troubleshooting
| Fault Phenomenon | Factor Analysis | Elimination Method |
|---|---|---|
| No display after the instrument is powered on | Incorrect wiring mode. Abnormal voltage supplied for the instrument. |
If wiring is incorrect, reconnect based on the correct wiring diagram. If voltage is abnormal, supply the correct voltage per specifications. Contact local supplier if the fault persists. |
| Abnormal RS485 communication | The RS485 communication cable is disconnected, short-circuited, or reversely connected. The address, baud rate, data bit, and parity bit of the instrument do not match the host computer. The end of the RS485 communication cable has not been matched with resistance (for distances over 100 meters). Communication protocol order of the host computer is not matched. |
Reconnect or replace the communication cable. Set the address, baud rate, data bit, and parity bit to match the host computer. For communication distances over 100 meters, lower the baud rate or add a 120Ω resistance at the start and end terminals. |
| Inaccurate energy metering | Incorrect wiring; check phase sequence for voltage and current. High-end and low-end of the current transformer inlet are reversely connected. Pa, Pb, and Pc values are abnormal if there is any negative value. |
If wiring is incorrect, reconnect based on the correct wiring diagram. Contact local supplier if the fault persists. |
4 Technical Specification
4.1 Limit of error caused by the current augment
Table 4-1 The limit value of the active percentage error of meters on balanced load
| Type | Current Value | Power Factor | Percent Error Limits for Various Classes of Meter | ||
|---|---|---|---|---|---|
| Class C | Class B | Class A | |||
| Connection through current transformers | 0.01 In ≤ I < 0.05 In | 1 | ±1.0 | ±1.5 | ±2.0 |
| 0.05 In ≤ I ≤ Imax | 1 | ±0.5 | ±1.0 | ±1.2 | |
| 0.02 In ≤ I < 0.1 In | 0.5L, 0.8C | ±1.0 | ±1.5 | ±2.0 | |
| 0.1 In ≤ I ≤ Imax | 0.5L, 0.8C | ±1.0 | ±1.0 | ±1.2 | |
| Direct connection | 0.05 Ib ≤ I < 0.1 Ib | 1 | - | ±1.5 | ±2.0 |
| 0.1 Ib ≤ I ≤ Imax | 1 | - | ±1.0 | ±1.2 | |
| 0.01 Ib ≤ I < 0.2 Ib | 0.5L, 0.8C | - | ±1.5 | ±2.0 | |
| 0.2 Ib ≤ I ≤ Imax | 0.5L, 0.8C | - | ±1.0 | ±1.2 |
Note: In: secondary rated current of the current transformer; Ib: calibrated current of the meter. L: inductive; C: capacitive.
Table 4-2 The limit value of the reactive percentage error of meters on balanced load
| Current Value | Direction connection | Connection through current transformers | sin φ (inductive or capacitive) | Percentage Error Limits for Various Classes of Meter | ||
|---|---|---|---|---|---|---|
| Class A | ||||||
| 0.05 Ib ≤ I < 0.1 Ib | 0.02 In ≤ I < 0.05 In | 1 | ±2.5 | |||
| 0.1 Ib ≤ I ≤ Imax | 0.05 In ≤ I ≤ Imax | 1 | ±2.0 | |||
| 0.1 Ib ≤ I < 0.2 Ib | 0.05 In ≤ I < 0.1 In | 0.5 | ±2.5 | |||
| 0.2 Ib ≤ I ≤ Imax | 0.1 In ≤ I ≤ Imax | 0.5 | ±2.0 | |||
| 0.2 Ib ≤ I ≤ Imax | 0.1 In ≤ I ≤ Imax | 0.25 | ±2.5 | |||
Table 4-3 The limit value of the reactive percentage error of meters on balanced load
| Current Value | Direction connection | Connection through current transformers | Power Factor | Percentage Error Limits for Various Classes of Meter | ||
|---|---|---|---|---|---|---|
| Class C | Class B | Class A | ||||
| 0.1 Ib ≤ I ≤ Imax | 0.05 In ≤ I ≤ Imax | 1 | ±0.6 | ±2.0 | ±3.0 | |
| 0.2 Ib ≤ I ≤ Imax | 0.1 In ≤ I ≤ Imax | 0.5L | ±1.0 | ±2.0 | ±3.0 | |
Table 4-4 The limit value of the reactive percentage error of meters on imbalanced load
| Current Value | Direction connection | Connection through current transformers | Power Factor | Percentage Error Limits for Various Classes of Meter | ||
|---|---|---|---|---|---|---|
| Class A | ||||||
| 0.1 Ib ≤ I ≤ Imax | 0.05 In ≤ I ≤ Imax | 1 | ±3.0 | |||
| 0.2 Ib ≤ I ≤ Imax | 0.1 In ≤ I ≤ Imax | 0.5 | ±3.0 | |||
4.2 Start
Under a power factor of 1.0 and starting current, the instrument can be started and continuously measured. For multi-phase instruments, it will bring a balanced load. If designed for dual directional energy measurement, it is applicable for each direction of energy.
Table 4-5 Start Current
| Type | Class C | Class of Meter Class B | Class A | Power Factor |
|---|---|---|---|---|
| Direct connection | - | 0.004 Ib | 0.005 Ib | 1 |
| Connection through current transformers | 0.001 Ib | 0.002 Ib | 0.003 Ib | 1 |
4.3 Defluction
When voltage is applied with no current, the meter's test output should not produce more than one pulse. During testing, disconnect the current circuit and apply 115% of the referenced voltage to the voltage circuit.
4.4 Environmental Parameter
| Parameter | Value |
|---|---|
| Limited working temperature range | -25°C - 70°C |
| Relative humidity (annual average) | ≤75% |
| Altitude | ≤4000 m |
| Atmospheric pressure | 63 kPa-106 kPa |
4.5 Electrical Parameter
| Parameter | Value |
|---|---|
| Specified operating voltage range | 0.9 Un-1.1 Un |
| Extended operating voltage range | 0.8 Un-1.15 Un |
| Limiting operating voltage range | 0 Un-1.15 Un |
| Voltage line power consumption | ≤1.5 W/6 VA |
| Current line power consumption | I<10 A: ≤0.2 VA I≥10 A: ≤0.4 VA |
| Data storage time after power interruption | ≥10 years |
4.6 Technical Parameter
| Parameter | Value |
|---|---|
| Model | DTSU666 (CT-3 × 100 A) |
| Power Supply | 3P4W |
| Grid type | |
| Input voltage (phase voltage) | 154 Vac - 253 Vac |
| Power consumption | <1.5 W |
| Measuring Range | Phase voltage: 154 Vac - 253 Vac Current: 0 - 100 A |
| Measuring Accuracy | 0.01 In ≤ I ≤ 0.05 In(1): ±1.5% 0.05 In ≤ I ≤ In(1): ±1.0% |
| Communication | Interface: RS485 Communication protocol: Modbus-RTU |
| Mechanical Data | Wiring type: Via-CT Ambient temperature range: -25°C - 70°C Dimensions (W × H × D): 72 × 100 × 65 mm Mounting type: DIN35 Rail |
| CT Data | Thread: Single turn Install: Buckle Ambient temperature range: -25°C - 70°C Dimensions (W × H × D): 44 × 77 × 33 mm Cable length: 6 m |
(1) Secondary rated current of the current transformer.
Contact Information
Hoymiles
Floor 6-10, Building 5, 99 Housheng Road, Gongshu District, Hangzhou 310015, P. R. China
Phone: +86 571 2805 6101
General inquiry: info@hoymiles.com
Technical support: service@hoymiles.com
Visit us at: https://www.hoymiles.com/
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