Sungrow Three-Phase Smart Energy Meter
Quick Installation Guide
Model: DTSU666-20
Applicability
This manual is applicable to the Sungrow Three-phase Smart Energy Meter, model DTSU666-20. Keep this manual in a convenient place for future reference. The latest manual can be acquired at support.sungrowpower.com.
Target Group
Only qualified personnel with the following skills are allowed to perform the work described in this document:
- Training in the installation and commissioning of electrical systems.
- Capability of coping with dangerous and emergency situations during installation and commissioning.
- Familiarity with country/regional standards and specifications.
- Knowledge of and compliance with this manual and other related documents.
Intended Use
The Smart Energy Meter is designed for indoor use only. It is a measuring device detecting the electrical values at the grid-connected point. It cannot be used for billing purposes. Data collected by this meter on PV power generation may differ from the main Smart Energy Meter. Any use other than described herein is prohibited. Do not make modifications to the product. Inappropriate usage can cause damage or destruction to the Smart Energy Meter. The meter must not be operated beyond the values specified in the technical data.
Safety Precautions
⚡ DANGER: Lethal voltages and danger to life due to electric shock!
- Only use the Smart Energy Meter in a dry environment and keep it away from liquids.
- Install the Smart Energy Meter in the switch cabinet only and ensure that the connection areas for the line and neutral conductors are behind an insulating cover or have contact protection.
- Install an external disconnect switch between the Smart Energy Meter and the grid-connection point. The external disconnector must be close to and easily accessible from the Smart Energy Meter.
- Disconnect the Smart Energy Meter from voltage sources before cleaning. Clean the Smart Energy Meter with a dry cloth only.
⚠️ WARNING: Fire hazard!
- If a fuse is missing or incorrect, a fire may be caused when a fault occurs, potentially resulting in death or serious injury.
Technical Data
| Parameters | DTSU666-20 |
|---|---|
| Nominal voltage | 230Vac L-N / 400Vac L-L |
| Input voltage range | 50 ... 280Vac L-N / 85 ... 485Vac L-L |
| Current Transformer(CT) | ***[1]/0.333V |
| Grid frequency | 50Hz/60Hz |
| Operating temperature | -25 ℃ ... +70 ℃ |
| Relative humidity | < 75% (non-condensing) |
| Dimensions (W x H x D) | 118 x 72 x 65.5 mm |
[1] *** indicates the input current.
Voltage current transformers are suitable for: 100A, 250A, 400A, 500A.
Delivery Contents
Related components in the scope of delivery:
- Smart Energy Meter (DTSU666-20)
- RS485 cable *
- Quick installation guide
- Current Transformer(CT) **
* The RS485 cable is included in the inverter package. If you cannot find the cable, please contact SUNGROW.
** The CT (Current Transformer) is included in the accessories shipped with the inverter. There are 3 CTs if the product is sold to the European region and 2 CTs if the product is sold to the Australian region.
NOTICE: Contact SUNGROW or the distributor in case of any damaged or missing components.
Three-phase Smart Energy Meter dimensions
CT Dimensions
The length of the 100 A CT and 250A CT cables is 8000±20mm. If the CT cable is excessively long, cut it to the appropriate length according to the actual on-site situation.
Three-phase Smart Energy Meter and its terminals
| Designation | Description |
|---|---|
| A | 2, 5, 8, 10 |
| B | LCD display |
| C | Key |
| D | A, B |
| E | PQ-, P+ |
| F* | 1, 3, 4, 6, 7, 9 |
| G* | 31, 33, 34, 36, 37, 39 |
| H | 91, 92 |
Description of Terminal Functions:
- A (Terminals 2, 5, 8, 10): Voltage sampling terminals.
- B: LCD display showing active energy and reactive energy, etc.
- C (Keys): SET: confirm selection or settings; ESC: return to previous menu or cancel settings; →: increase setting value.
- D (Terminals A, B): Communication terminals.
- E: PQ-, P+ (Reserved).
- F* (Terminals 1, 3, 4, 6, 7, 9): CT1 / Coils1 Current Input.
- G* (Terminals 31, 33, 34, 36, 37, 39): CT2 / Coils2 Current Input.
- H (Terminals 91, 92): Reserved.
* Please remove the shorting wires as needed, and retain wires for unused terminals.
Meter Ports and Wiring
Wiring for Single-phase Use:
NOTICE: If there is only L1 (to terminal 2) and the neutral conductor (to terminal 10), then the three-phase Smart Energy Meter can be used as a single-phase Smart Energy Meter.
Installation
Mount the Smart Energy Meter to a 35 mm DIN rail. Hook it into the top edge of the rail and press down until it snaps into place.
Cable Connection
- Turn off solar switch, load switch, main switch, and other power switches, and secure them against reconnection.
- Take out the RS485 cable from the inverter's packaging.
- Connect the plugs A and B to terminals A and B on the Smart Energy Meter.
Wiring Scenarios
Step 4: Connect wires to the terminals on the Smart Energy Meter, as shown below.
Scenario 1: Three-phase hybrid inverter + Three-phase PV inverter + Three-phase grid
Scenario 2: Three-phase hybrid inverter + Single-phase PV inverter + Three-phase grid
Scenario 3: Single-phase hybrid inverter + Three-phase PV inverter + Three-phase grid
Scenario 4: Single-phase hybrid inverter + Single-phase PV inverter + Three-phase grid
Scenario 5: Single-phase hybrid inverter + Single-phase PV inverter + Single-phase grid
Step 5: CT Direction and Cable Installation Check
After the meter is connected, please check the CT direction and cable installation carefully. The arrow on the CT should always point to the load side.
Please check:
- Whether the CT direction is correct. The arrow on the CT should point to the load side.
- Whether CTs are connected to correct cables. The CT corresponding to IA and IA* should be connected to cable L1, the CT corresponding to IB and IB* should be connected to cable L2, and the CT corresponding to IC and IC* should be connected to cable L3.
- Whether the cables connected to L1, L2, L3, and N terminals of the meter are correct.
Steps 6 & 7: Final Installation
Step 6: For inverter cable connection, refer to the user manual of the corresponding inverter.
Step 7: Cover the Smart Energy Meter with the insulating cover or contact protection of the sub-distribution. Switch on the power supply to the sub-distribution.
Displayed Function
From the displayed interface, the electrical parameter and energy data are all primary side data (that is, multiplied by current and voltage ratios). The energy measuring value will be displayed with seven digits, with the displaying range from 0.00kWh to 9999999MWh.
Display Interface and Instructions
| No. | Display interface | Instruction | No. | Display interface | Instruction |
|---|---|---|---|---|---|
| 1 | π1 9.600 |
Protocol: Modbus-RTU, address=001, Baudrate=9600, None parity, 1 stop bits | 16 | FC -0.500 |
First channel Combined phase power factor PFc=-0.500 |
| 2 | ----001 |
(Protocol details) | 17 | UA 220.0 |
Second channel Phase A voltage =220.0V |
| 3 | UA 220.0 |
First channel Phase A voltage =220.0V | 18 | UB 220.1 |
Second channel Phase A voltage =220.1V |
| 4 | UB 220.1 |
First channel Phase A voltage =220.1V | 19 | UC 220.2 |
Second channel Phase A voltage =220.2V |
| 5 | UC 220.2 |
First channel Phase A voltage =220.2V | 20 | IA 5.000 |
Second channel Phase A voltage =5.000A |
| 6 | IA 5.000 |
First channel Phase A voltage =5.000A | 21 | IB 5.001 |
Second channel Phase A voltage =5.001A |
| 7 | IB 5.001 |
First channel Phase A voltage =5.001A | 22 | IC 5.002 |
Second channel Phase A voltage =5.002A |
| 8 | IC 5.002 |
First channel Phase A voltage =5.002A | 23 | PE 3.291W |
Second channel Combined phase active power =3.291kW |
| 9 | PE 3.291W |
First channel Combined phase active power =3.291kW | 24 | PA 1.090kW |
Second channel Combined phase active power =1.090kW |
| 10 | PA 1.090kW |
First channel Combined phase active power =1.090kW | 25 | PB 1.101kW |
Second channel Combined phase active power =1.101kW |
| 11 | PB 1.101kW |
First channel Combined phase active power =1.101kW | 26 | PC 1.100kW |
Second channel Combined phase active power =1.100kW |
| 12 | PC 1.100kW |
First channel Combined phase active power =1.100kW | 27 | FE 0.500 |
Second channel Combined phase power factor PFt=0.500 |
| 13 | FE 0.500 |
First channel Combined phase power factor PFt=0.500 | 28 | FA 1.000 |
Second channel Combined phase power factor PFa=1.000 |
| 14 | FA 1.000 |
First channel Combined phase power factor PFa=1.000 | 29 | FB 0.500 |
Second channel Combined phase power factor PFb=0.500 |
| 15 | FB 0.500 |
First channel Combined phase power factor PFb=0.500 | 30 | FC -0.500 |
Second channel Combined phase power factor PFc=-0.500 |
Communication Protocol Details:
- The communication address of Modbus protocol is 1 decimal data (1 ~ 254).
- The factory default baud rate is 9600bps, N.8.1.
- E1 means even check one stop bit, O1 means odd check one stop bit, N2 means two stop bits without check, N1 means one stop bit without check.
- When RS485 communicating, the telephone sign will flash.
Programming Function
The parameters of the meter equipped only with 100A/0.333VCT have been set before delivery and can be installed directly after acceptance without setting parameters again. Meters equipped with other CT and Rogwski coils need to set their parameters before installation.
Programming Parameter
| Parameter | Value range | Description |
|---|---|---|
CT |
1 ~ 8 | 1: CT01:100A/333mV 3: CT03:400A/333mV 5: RS01:1000A/333mV 7: RS03:3000A/333mV |
| 2: CT02:250A/333mV 4: CT04:500A/333mV 6: RS02:2000A/333mV 8: RS04:4000A/333mV |
||
Pt |
0.1 ~ 1.0 | 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. |
Prot |
1: 645 2: n.2 3: n.1 4: E.1 5: O.1 |
Settings for communication stop bit and Parity: bits 1: 645mode 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: 1.200 1: 2.400 2: 4.800 3: 9.600 |
Communication baud rate: 0: 1.200 bps 1: 2.400 bps 2: 4.800 bps 3: 9.600 bps |
Addr |
1 ~ 254 | 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: P0 1: P1 |
Pulse output: P0: First channel active energy pulse P1: Second channel active energy pulse |
d1SP |
0 ~ 30 | Display in turns (second) 0: Timely display 1 ~ 30: Time interval of actual display |
bLCd |
0 ~ 30 | Backlight lighting time control (minute) 0: Normally light 1 ~ 30: Backlight lighting time without button operation |
Programming Parameter Button Description
Button description: “SET” represents “confirm” or “cursor shift” (when input digits), “ESC” represents “exit”, and “→” represents “add”. The password is 701 by default.
When inputting digits, “SET” can be used as a cursor, “→” is the “add” button, and “ESC” exits the programming operation interface or switches to the character interface from the digit modification interface. Digits are added from the beginning after setting the digit to the maximum value.
Troubleshooting
| Fault phenomenon | Reason analysis | Elimination method |
|---|---|---|
| No display after the instrument being powered on | 1. Incorrect wiring mode. 2. Abnormal voltage supplied for the instrument. |
1. If the wiring mode is incorrect, please connect based on the correct wiring mode. 2. If the supplied voltage is abnormal, please supply the voltage as per the instrument specification. |
| Abnormal RS485 communication | 1. The RS485 communication cable is disconnected, short circuit, or reversely connected. 2. The address, baud rate, data bit, and parity bit of the instrument are not in accordance with the inverter. |
1. If there are problems with the communication cable, please change the cable. 2. Set the address, baud rate, data bit, and parity bit of the instrument to be the same as the inverter through buttons and the “parameter setting”. |
| Power metering inaccuracy | 1. Wrong wiring; please check whether the corresponding phase sequence of voltage and current is correct. 2. Check whether the high and low ends of the current transformer inlet are reversely connected. Pa, Pb, and Pc are abnormal if the values are negative. |
1. For wrong wiring, please connect based on the correct wiring mode. 2. If a negative value is displayed, change the cable connection mode of the current transformer to ensure that the high and low ends are connected properly. |
