maxsel DTSU666-HW Smart Power Sensor

Overview

Dimensions

DTSU666-HW

Note: The dimensional tolerance is ± 1 mm.

Appearance

Specifications on the front panel

 

Nameplate

Key Specifications

Category	DTSU666-HW
Nominal voltage	230 V AC/400 V AC, 50 Hz/60 Hz
Current measurement range	Direct connection: 0–80 A Connection through current transformers: > 80 A
Voltage measurement range	90–1000 V (line voltage; potential transformers are required if the voltage is greater than 500 V)
Electricity metering accuracy	Class 1 (error within ±1%)
Power grid system	Three-phase four-wire or three-phase three-wire
Baud rate	4800/9600/19200/115200 bps (default value: 9600 bps)
Operating temperature	–25℃ to +60℃
Installation mode	Guide rail-mounted
Certification	CE, RCM, and UKCA

Port Definition

• Input voltage: When the line voltage is less than or equal to 500 V, connect the meter directly. When the line voltage is greater than 500 V, connect the meter through potential transformers.
• Input current: When the input current is 0 A to 80 A, connect the meter directly (channel 1). When the input current is greater than or equal to 80 A, connect the meter through current transformers (channel 2).

                                                                                            Cable Inlet                 Cable Outlet

Installing the DTSU666-HW

1. Install the Smart Power Sensor on the standard guide rail of DIN35mm.
2. Press the Smart Power Sensor downwards onto the guide rail, and then push it in place along the guide rail.

Installing Cables

Preparing Cables

Cable	Port	Type	Conductor Cross- sectional Area Range	Outer Diameter	Source
Channel 1 voltage cable	UA-1 and 3	Single-core outdoor copper cable	25 mm2	10 mm	Prepared by the customer
	UB-4 and 6
	UC-7 and 9
	UN-10 and 12
Channel 2 voltage cable	UA-1	Single-core outdoor copper cable	4–25 mm2	5–10 mm	Prepared by the customer
	UB-4
	UC-7
	UN-10
Channel 2 current transformer cable	IA*-31	Single-core outdoor copper cable	2–4 mm2	3–5 mm	Prepared by the customer or supplied with current transformers
	IA-33
	IB*-34
	IB-36
	IC*-37
	IC-39
Communications cable	RS485A-24	Two-core outdoor shielded twisted pair copper cable	0.25–1.5 mm2	4–11 mm	Supplied by the manufacturer
	RS485B-25

Note: The maximum torque of 1, 3, 4, 6, 7, 9, 10, and 12 terminal screws is 1.7 N·m, and the recommended torque is 0.9–1.1 N·m. The maximum torque of 31, 33, 34, 36, 37, 39, 24, and 25 terminal screws is 0.4 N·m, and the recommended torque is 0.15–0.25 N·m.

Note:  Each phase of UA, UB, and UC in the Smart Power Sensor is connected with a fuse and a thermistor to prevent damage caused by external short circuits. UA, UB, and UC do not need external fuse protection.

Wiring Scenarios

Current	≤ 80 A		> 80 A		≥ 0 A
Line voltage	≤ 500 V				> 500 V
Connection mode	Current and voltage direct connection		Connection through current transformers and voltage direct connection		Connection through current transformers and potential transformers
Connection setting	Direct connection: SPEC = 1 (default)		Connection through transformers: SPEC = 0
Current transformation ratio	CT = 1 (default)		CT = Ratio of the installed current transformer
Potential transformation ratio	PT = 1.0 (default)				PT = Ratio of the installed potential transformer
Wiring mode	3P4W: net = n.34 (default)	3P3W: net = n.33	3P4W: net = n.34 (default)	3P3W: net = n.33	3P4W: net = n.34 (default)	3P3W: net = n.33

Note: You need to set parameters after cable connections are complete. For details, see section 4 “Display and Parameter Settings”.

Current and Voltage Direct Connection (Current ≤ 80 A and Line 3.3 Voltage ≤ 500 V)

Smart Logger networking

• Three-phase four-wire connection
  Note: In the SmartLogger networking scenario, the power meter is connected to the SmartLogger. In the non-SmartLogger networking scenario, the power meter is connected to the inverter.
  1. Shield layer of the signal cable
• Three-phase three-wire connection
  1. Shield layer of the signal cable

Smart Dongle networking

• Three-phase four-wire connection
  1. Shield layer of the signal cable
• Three-phase three-wire connection
  1. Shield layer of the signal cable

Note: You need to set parameters after cable connections are complete. For details, see section 4 “Display and Parameter Settings”.

Connection Through Current Transformer and Voltage Direct Connection (Current > 80 A, Line Voltage ≤ 500 V)

Current transformers specifications: The accuracy class is 0.5, and the current on the secondary side is 1 A or 5 A.

SmartLogger networking

• Three-phase four-wire connection
  Note: In the SmartLogger networking scenario, the power meter is connected to the SmartLogger. In the non-SmartLogger networking scenario, the power meter is connected to the inverter.
  1.  Shield layer of the signal cable
     
• Three-phase three-wire connection
  

Caution: Please ensure that the ground cable is installed securely. Poor grounding may cause electric shocks.

Note:

• You need to set parameters after cable connections are complete. For details, see section 4 “Display and Parameter Settings”.
• For the three-phase three-wire connection, phase B does not need to connect to a current transformer.

Smart Dongle networking

• Three-phase four-wire connection
  1. Shield layer of the signal cable
     
• Three-phase three-wire connection
  Caution: Please ensure that the ground cable is installed securely. Poor grounding may cause electric shocks.
  Note:
•  You need to set parameters after cable connections are complete. For details, see section 4 “Display and Parameter Settings”.
• For the three-phase three-wire connection, phase B does not need to connect to a current transformer.
  
  1. Shield layer of the signal cable

Connection Through Current Transformer and Potential
Transformer (Current ≥ 0 A, Line Voltage > 500 V)

• Three-phase four-wire connection
• Three-phase three-wire connection

Caution:  Please ensure that the ground cable is installed securely. Poor grounding may cause electric shocks.

Note: You need to set parameters after cable connections are complete. For details, see section 4 “Display and Parameter Settings”.

Display and Parameter Settings

Display

The button → is used to switch the displays. Set parameter disp to enable the rotation display function.

No.	Display	Description	No.	Display	Description
1		Positive active energy = 10000.00 kWh	2		Negative active energy = 2345.67 kWh
3		None parity, 8 data bits, and 1 stop bit; baud rate = 9600 bps (default)	4		011 represents address (default)
5		Phase A voltage = 220.0 V	6		Phase B voltage = 220.1 V
7		Phase C voltage = 220.2 V	8		Phase A current = 5.000 A
9		Phase B current = 5.001 A	10		Phase C current = 5.002 A
11		Total phase active power = 3.291 kW	12		Phase A active power = 1.090 kW
13		Phase B active power = 1.101 kW	14		Phase C active power = 1.100 kW
15		Total phase power factor PFt = 0.500	16		Phase A power factor PFa = 1.000
17		Phase B power factor PFb = 0.500	18		Phase C power factor PFc = –0.500

Parameter Settings

No.	Parameter	Value Range	Description
1		1–6553	Current transformer ratio
2		0.1–999.9	Potential transformer ratio
3		1: 645 2: n.2 3: n.1 4: E.1 5: 0.1	Communication protocol switchover: 1: Factory 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, 0.1
4		1–247	Modbus communication address
5		0: 1.200 1: 2.400 2: 4.800 3: 9.600 4: 19.20 5: 115.2	Communication baud rate: 0: 1200 bps 2400 bps 4800 bps 9600 bps 19200 bps 115200 bps
6		0: n.34 1: n.33	Wiring mode: 0: n.34, three-phase four-wire 1: n.33, three-phase three-wire
7		0–30	Rotation display time (s): 0: Fixed display 1–30: Time interval of rotation display
8		0–30	Backlight illumination time control (minutes): 0: Steady on 1–30: Time of backlight illumination without key operation
9		0: ct 1: dc	Channel switchover: 0: Transformer connection 1: Direct connection

Parameter Setting Operations

Button description: SET means “confirm” or “cursor move” (when inputting numbers or parameters), ESC means “exit”, and → means “add”. The default user password is 701.

• Set wiring mode (three-phase four-wire or three-phase three-wire) and channel switchover (direct connection or current transformer connection):
• Set the current transformation ratio or potential transformation ratio:
• Set communication address or baud rate:

Note:The communication parameters are set for the Smart Power Sensor before delivery. If the communication is abnormal, check and set the parameters.

• Modify user password:

Troubleshooting

Symptom	Cause Analysis	Troubleshooting Method
No display after power-on	The cable connection is incorrect. The voltage supplied to the meter is abnormal.	Connect the cables correctly (see wiring diagrams). Supply the correct voltage based on the specifications.
Abnormal RS485 communication	The RS485 communication cable is disconnected, short-circuited, or reversely connected. The communication address, baud rate, data bit, and parity bit of the meter do not match those of the inverter.	If the communication cable is faulty, replace it. Set the communication address, baud rate, data bit, and parity bit of the meter to be the same as those of the inverter by pressing buttons. For details, see “Parameter Settings”.
Inaccurate metering	The cable connection is incorrect. Check whether the corresponding phase sequence of voltage and current is correct. Check whether the high and low ends of the current transformer inlet are reversely connected. If the values Pa, Pb, and Pc are negative, the high and low ends are connected incorrectly.	Connect the cables correctly (see wiring diagrams). If a negative value is displayed, change the cable connection for the current transformer to ensure that the high and low ends are connected correctly.

Installation Verification

1. Check that all mounting brackets are securely installed and all screws are tightened.
2. Check that all cables are reliably connected in correct polarity without short circuit.

Customer Service Contact

Customer Service Contact
Region	Country	Email	Tel
Europe	France	eu_inverter_support@huawei.com	0080033888888
	Germany
	Spain
	Italy
	UK
	Netherlands
	Other countries	For details, see solar.huawei.com.
Asia Pacific	Australia	eu_inverter_support@huawei.com	1800046639
	Turkey	eu_inverter_support@huawei.com	–
	Malaysia	apsupport@huawei.com	0080021686868 /1800220036
	Thailand		(+66) 26542662 (local call rates)
			1800290055 (free in Thailand)
	China	solarservice@huawei.com	400-822-9999
	Other countries	apsupport@huawei.com	0060-3-21686868
Japan	Japan	Japan_ESC@ms.huawei.com	0120258367
India	India	indiaenterprise_TAC@huawei.com	1800 103 8009
South Korea	South Korea	Japan_ESC@ms.huawei.com	–
North America	USA	eu_inverter_support@huawei.com	1-877-948-2934
	Canada	eu_inverter_support@huawei.com	1-855-482-9343
Latin America	Mexico	la_inverter_support@huawei.com	018007703456 /0052-442-4288288
	Argentina		0-8009993456
	Brazil		0-8005953456
	Chile		800201866 (fixed-line only)
	Other countries		0052-442-4288288
Middle East and Africa	Egypt	eu_inverter_support@huawei.com	08002229000/0020235353900
	UAE		08002229000
	South Africa		0800222900
	Saudi Arabia		8001161177
	Pakistan		0092512800019
	Morocco		0800009900
	Other countries		0020235353900

Documents / Resources

maxsel DTSU666-HW Smart Power Sensor [pdf] User Guide DTSU666-HW Smart Power Sensor, DTSU666-HW, Smart Power Sensor, Power Sensor, Sensor

References

• User Manual