TPM-CT-C-EU(DTSU666) Three-phase Smart Meter Quick Guide
1. Overview
The DTSU666 series three-phase four-wire electronic energy meter (DIN-rail) is designed for power monitoring and energy metering demands in electric power systems, communication industries, and construction industries. It functions as an intelligent instrument combining measurement and communication. It is primarily used for measuring and displaying electric parameters in electric circuits, including three voltages, three currents, active power, reactive power, frequency, positive/negative energy, and four-quadrant energy. The meter features standard DIN35mm DIN rail mounting and a modular design, offering small volume, easy installation, and straightforward networking. It is compatible with Growatt Three-phase Storage/Hybrid Inverters.
2. Technical Parameters
| General Specifications | Environment | ||
|---|---|---|---|
| Rated voltage | 3×230/400Vac | Rated temperature | -10℃~+45℃ |
| Reference frequency | 50Hz/60Hz | Limit temperature | -25℃~+70℃ |
| Specified operating voltage range | 0.9Un~1.1Un | Relative humidity (average annual) | <75% |
| Extended operating voltage range | 0.8Un~1.15Un | Atmosphere | 63.0kPa~106.0kPa |
| Voltage line power consumption | <1.5W/6VA | Installation category | CAT III |
| Input current | 1.5(6)A | Degree of pollution | Conform to RoHS |
| Starting current | 0.015A | ||
| AC voltage withstand | 2KV/5mA for 1 minute | Communication | |
| Impulse voltage withstand | 4KV-1.2/50uS waveform | Communication | RS485 output for Modbus RTU |
| Max. Reading | 9999999kWh | Baud rate | 9600 |
| Accuracy | Pulse | 400imp/kWh | |
| Active power | 0.5% of range maximum | ||
| Reactive power | 2% of range maximum | ||
| Mechanics | |
|---|---|
| Din rail dimensions | 100x72x65(LxWxH) |
| Mounting | DIN rail 35mm |
| Sealing | IP51 (indoor) |
3. Unpacking
The unpacking section includes the following items:
- Item A: Three phase meter (Quantity: 1)
- Item B: User Manual (Quantity: 1)
- Item C: RS485 cable (standard length 15m) (Quantity: 1)
- Item D: Current Transformer (Quantity: 3)
The visual shows the meter unit, a user manual booklet, a coiled RS485 communication cable, and three current transformers.
4. Dimension (Unit: mm)
The smart meter has the following dimensions: Length 100mm, Width 72mm, and Height 65mm. It is designed for mounting on a standard 35mm DIN rail.
5. Installation
Notes:
- The Growatt Storage Inverter and the Hybrid Inverter are collectively referred to as "the Storage/Hybrid Inverter".
- The grid connection is shown on the right side, with current flowing from P1 (grid side) to P2 (load side).
A. Voltage sampling and power supply wiring
Connect the voltage sampling lines to the meter as follows:
- L1 voltage sampling line: Meter Pin 2
- L2 voltage sampling line: Meter Pin 5
- L3 voltage sampling line: Meter Pin 8
- N voltage sampling line: Meter Pin 10
B. Current transformer wiring
Connect the current transformers (CTs) to the meter:
- L1 CT: S1 Line to meter Pin 1, S2 Line to meter Pin 3
- L2 CT: S1 Line to meter Pin 4, S2 Line to meter Pin 6
- L3 CT: S1 Line to meter Pin 7, S2 Line to meter Pin 9
The diagram shows the grid on the right, with current flowing from P1 to P2.
C. RS485 cable wiring
Connect the RS485 communication cable:
- RS485A to meter Pin 14
- RS485B to meter Pin 13
Note: If using purchased cables, ensure correct differentiation between 485-A and 485-B.
D. Connecting the meter to the Storage/Hybrid Inverter
The system wiring diagram illustrates the overall connection. For Growatt Storage/Hybrid Inverters, connect the meter to the COM1 port. The diagram shows connections for grid, load, breakers, and the inverter, including power and communication cables.
E. WIT connection
When connecting the smart meter to WIT (e.g., an inverter), connect one end of the cable to the smart meter's Terminal 13 (485B) and Terminal 14 (485A). Connect the other end to the inverter's COM1 port, specifically Pin 6 (485A) and Pin 7 (485B). Typically, the red cable is used for 485A and the black cable for 485B.
F. WIT connector dismantling
Dismantle the 16-pin connector provided with the WIT device, setting aside the waterproof plug. Route the cables sequentially through the connector parts, connect them to Pin 6 and Pin 7, and then attach the connector to the inverter's COM1 port.
G. RS485 cable length
The standard RS485 cable length is 15m. If a longer cable is required, use an intact cable. The RS485 cable should be less than 100m, with a recommended maximum length of 25m.
Notes:
- Ensure correct connection of L/N input and output cables. Verify that the input voltage and input current are within the permissible range to prevent meter damage.
- Input and output wires must be connected correctly for proper meter operation.
6. Display
The meter's display shows electrical parameters and power data, calculated from primary-side current and voltage values. The energy measurement value is displayed in seven digits, ranging from 0.00kWh to 999999.9 kWh.
The liquid crystal display (Diagram 1) shows various readings.
| NO | Display interface | Instruction | NO | Display interface | Instruction |
|---|---|---|---|---|---|
| 1 | 10000.00 kWh | Imported active energy =10000.00KWh | 10 | 5.002 A | Phase C current =5.002A |
| 2 | 2345.67 kWh | Exported active energy =2345.67KWh | 11 | 3.291 kW | Combined phase active power =3.291KW |
| 3 | n1-9.600 | Communication protocol is ModBus-RTU. N1 indicates none parity, 1 stop bit. 9600 indicates that the baud rate is 9600bps. | 12 | 1.090 kW | Phase A active power =1.090KW |
| 4 | ----004 | 004 indicates that the meter default address is 04. | 13 | 1.101 kW | Phase B active power =1.101KW |
| 5 | UA 220.0 V | Phase A voltage =220.0V | 14 | 1.100 kW | Phase C active power =1.100KW |
| 6 | UB 220.1 V | Phase B voltage =220.1V | 15 | PF 0.500 L | Combined phase power factor PFt=0.500L |
| 7 | UC 220.2 V | Phase C voltage =220.2V | 16 | PF 1.000 L | Phase A power factor Pfa=1.000L |
| 8 | IA 5.000 A | Phase A current =5.000A | 17 | PF 0.500 L | Phase B power factor Pfb=0.500L |
| 9 | IB 5.001 A | Phase B current =5.001A | 18 | FC -0.500 L | Phase C power factor Pfc =-0.500L |
Note: The default communication address for the meter and the Growatt Three-phase Storage/Hybrid inverter is 04, with a baud rate of 9600. If communication fails, check parameter settings.
Button Description: "SET" button confirms or shifts cursor (when entering digits). "ESC" button exits. The "Add" button increments values. The default password is 701.
Setting Examples:
Diagram 2 illustrates setting examples for modifying current ratio (CT modification), PT modification, and voltage change. It shows sequences of button presses (e.g., Press 1 SET, Press 2 ESC) to navigate menus and input values.
Diagram 3 illustrates setting examples for modifying communication address and baud rate. It details button press sequences to access and change these settings, such as entering the password (701) to access the setting interface.
7. Troubleshooting
| Fault phenomenon | Reason analysis | Solution |
|---|---|---|
| Metering inaccuracy | 1. Wiring error; check phase sequence of voltage and current. 2. Current transformer output line is reversely connected. 3. Transformer ratio is not set, causing display of secondary data. | 1. Refer to the wiring diagram to check connections. 2. Correct the voltage ratio and current ratio settings if wrong. 3. Contact your local supplier if the issue persists. |
| RS485 communication error (Inverter error 401) | 1. RS485 communication cable is disconnected, short-circuited, or reversely connected. 2. Meter's address, baud rate, data bit, and parity bit do not match the inverter's settings. | 1. Replace the communication cable if it is faulty. 2. Adjust the meter's address, baud rate, data bit, and parity bit via the buttons. 3. Contact your local supplier if the issue persists. |
8. Service and contact
Shenzhen Growatt New Energy Co., Ltd.
4-13/F, Building A, Sino-German (Europe) Industrial Park, Hangcheng Blvd, Bao'an District, Shenzhen, China
Phone: +86 755 2747 1942
Email: service@ginverter.com
Website: www.ginverter.com
Download Manual: GR-UM-341-A-00
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