HUAWEI DTSU666-HW Smart Power Sensor User Guide

DTSU666-HW Smart Power Sensor

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Specifications

• Category: Smart Power Sensor
• Nominal voltage: Three-phase four-wire or
  three-phase three-wire
• Current measurement range: 80 A
• Voltage measurement range: 500 V
• Electricity metering accuracy: Not
  specified
• Power grid system: Not specified
• Baud rate: 4800/9600/19200/115200 bps (default
  value: 9600 bps)
• Operating temperature: Not specified
• Installation mode: DIN35mm standard guide
  rail
• Certification: Not specified

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	Channel	Type	Conductor Cross-sectional Area Range	Outer Diameter	Source
Channel 1 voltage cable	UA-1 and 3 UB-4 and 6 UC-7 and 9 UN-10 and 12	Single-core outdoor copper cable	25 mm2	10 mm	Prepared by the customer

Wiring Scenarios

Details on wiring scenarios, connection modes, transformation
ratios, and wiring modes are provided based on current and voltage
levels.

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

Instructions on SmartLogger networking and Smart Dongle
networking scenarios are provided with details on shield layers of
signal cables and parameter settings.

FAQ

Q: What should I do if I encounter issues during
installation?

A: If you encounter any issues during installation, please refer
to the troubleshooting section in the user manual or contact our
customer support for assistance.

Q: How do I set parameters after completing cable
connections?

A: After completing cable connections, you need to set
parameters based on the specific networking scenario. Refer to
section 4 Display and Parameter Settings for detailed
instructions.

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DTSU666-HW Smart Power Sensor
Quick Guide

Issue: 09 Date: 2025-02-23

ZTY0.464.1516

101 mm 45 mm 35 mm

1 Overview
1.1 Dimensions
DTSU666-HW 72 mm

80 mm 62 mm

The dimensional tolerance is ± 1 mm.

1.2 Appearance

Specifications on the front panel

Nameplate

Installation position

1

1.3 Key Specifications

Category Nominal voltage Current measurement range
Voltage measurement range
Electricity metering accuracy Power grid system Baud rate
Operating temperature Installation mode Certification

DTSU666-HW
230 V AC/400 V AC, 50 Hz/60 Hz Direct connection: 0­80 A
Connection through current transformers: > 80 A 90­1000 V (line voltage; potential transformers are required
if the voltage is greater than 500 V) Class 1 (error within ±1%)
Three-phase four-wire or three-phase three-wire 4800/9600/19200/115200 bps (default value: 9600 bps)
­25 to +60 Guide rail-mounted CE, RCM, and UKCA

1.4 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

2

2 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.

1.4
3 Installing Cables
3.1 Preparing Cables

Cable

Port

Channel 1 voltage cable

UA-1 and 3 UB-4 and 6 UC-7 and 9 UN-10 and 12

Channel 2 voltage cable

UA-1 UB-4 UC-7 UN-10

IA*-31

Channel 2 current transformer cable

IA-33 IB*-34 IB-36 IC*-37

IC-39

Communications cable

RS485A-24 RS485B-25

Type
Single-core outdoor copper
cable
Single-core outdoor copper
cable
Single-core outdoor copper
cable
Two-core outdoor shielded twisted pair copper cable

Conductor Cross-
sectional Area Range
25 mm2
4­25 mm2
2­4 mm2
0.25­1.5 mm2

Outer Diameter

Source

10 mm

Prepared by the customer

5­10 mm

Prepared by the customer

3­5 mm

Prepared by the customer or supplied with current transformers

Supplied by

4­11 mm

the

manufacturer

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 0.9­1.1 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 0.15­0.25 N·m.
3

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.

3.2 Wiring Scenarios

Current

80 A

> 80 A

0 A

Line voltage

500 V

> 500 V

Connection mode

Current and voltage direct connection

Connection through Connection through current

current transformers and transformers and potential

voltage direct connection

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

· You need to set parameters after cable connections are complete. For details, see section 4
“Display and Parameter Settings”.
· This meter is generally used in commercial and industrial high-current scenarios. In external CT scenarios, the precision of the secondary-side current is ±5 mA. For example, if a CT with a transformer ratio of 400/1 is selected, the error is ±2 A. This meter is not recommended
in scenarios where the plant power is low or the control precision of the grid-connection
point is high. Instead, use a meter with higher precision.

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3.3

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

SmartLogger networking

· Three-phase four-wire connection

In the SmartLogger networking scenario, the power meter is connected to the SmartLogger. In the nonSmartLogger 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
You need to set parameters after cable connections are complete. For details, see section 4 “Display and Parameter Settings”.
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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 You need to set parameters after cable connections are complete. For details, see section 4 “Display and Parameter Settings”.
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3.4

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

In the SmartLogger networking scenario, the power meter is connected to the SmartLogger. In the nonSmartLogger networking scenario, the power meter is connected to the inverter.

(1) Shield layer of the signal cable
· Three-phase three-wire connection
Please ensure that the ground cable is installed securely. Poor grounding may cause electric shocks.
· 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
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Smart Dongle networking
· Three-phase four-wire connection
(1) Shield layer of the signal cable · Three-phase three-wire connection
Please ensure that the ground cable is installed securely. Poor grounding may cause electric shocks.
· 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
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3.4

3.5

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

· Three-phase four-wire connection Cable outlet (OUT)

Current transformers
Cable inlet (IN) UA UB UC UN · Three-phase three-wire connection Cable outlet (OUT)
Current transformers
Cable inlet (IN) UA UB UC
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Please ensure that the ground cable is installed securely. Poor grounding may cause electric shocks.
You need to set parameters after cable connections are complete. For details, see section 4 “Display and Parameter Settings”.

4 Display and Parameter Settings
4.1 Display
The button is used to switch the displays. Set parameter disp to enable the rotation display function.

No.

Display

Description

No.

Positive active

1

energy

2

= 10000.00 kWh

None parity,

8 data bits,

3

and 1 stop bit;

4

baud rate = 9600

bps (default)

5

Phase A voltage = 220.0 V

6

7

Phase C voltage = 220.2 V

8

9

Phase B current = 5.001 A

10

Total phase active

11

power = 3.291

12

kW

Phase B active

13

power = 1.101

14

kW

Total phase

15

power factor

16

PFt = 0.500

Phase B power

17

factor

18

PFb = 0.500

Display

Description
Negative active energy
= 2345.67 kWh
011 represents address (default)
Phase B voltage = 220.1 V
Phase A current = 5.000 A
Phase C current = 5.002 A
Phase A active power = 1.090
kW
Phase C active power
= 1.100 kW
Phase A power factor
PFa = 1.000
Phase C power factor
PFc = ­0.500

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4.2 Parameter Settings

No.

Parameter

Value Range

Description

1

1­6553

Current transformer ratio

2

0.1­999.9

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

1­247

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 1: 2400 bps 2: 4800 bps 3: 9600 bps 4: 19200 bps 5: 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

Rotation display time (s):

7

0­30

0: Fixed display

1­30: Time interval of rotation display

Backlight illumination time control

(minutes):

8

0­30

0: Steady on

1­30: Time of backlight illumination

without key operation

9

0: ct 1: dc

Channel switchover: 0: Transformer connection 1: Direct connection

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4.3 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:
The communication parameters are set for the Smart Power Sensor before delivery. If the communication is abnormal, check and set the parameters.
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· Modify user password:

5 Troubleshooting

Symptom

Cause Analysis

Troubleshooting Method

No display after power-on

1. The cable connection is incorrect. 2. The voltage supplied to the meter
is abnormal.

1. Connect the cables correctly (see wiring diagrams).
2. Supply the correct voltage based on the specifications.

Abnormal RS485 communication
Inaccurate metering

1. The RS485 communication cable is disconnected, short-circuited, or reversely connected.
2. The communication address, baud rate, data bit, and parity bit of the meter do not match those of the inverter.
1. The cable connection is incorrect. 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. If the values Pa, Pb, and Pc are negative, the high and low ends are connected incorrectly.

1. If the communication cable is faulty, replace it.
2. 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”.
1. Connect the cables correctly (see wiring diagrams).
2. 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.

6 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.

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7 Customer Service Contact
https://digitalpower.huawei.com Path: About Us > Contact Us > Service Hotlines
8 Digital Power Customer Service
https://digitalpower.huawei.com/robotchat
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Documents / Resources

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

References

• User Manual