DTSU666-HW Smart Power Sensor Quick Guide

DTSU666-HW Smart Power Sensor
Quick Guide


Issue: 10
Date: 2025-04-16

ZTY0.464.1516
1 Overview
1.1 Dimensions

DTSU666-HW
72 mm 80 mm
62 mm
45 mm
35 mm
101 mm

Installation
position


The dimensional tolerance is ± 1 mm.

1.2 Appearance

Specifications on the front panel Nameplate


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1.3 Key Specifications

Category DTSU666-HW

Nominal voltage 230 V AC/400 V AC, 50 Hz/60 Hz
Direct connection: 0–80 A
Current measurement range
Connection through current transformers: > 80 A
90–1000 V (line voltage; potential transformers are required
Voltage measurement range
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

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


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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

Conductor
Cross- Outer
Cable Port Type Source
sectional Diameter
Area Range
UA-1 and 3
Channel 1 Single-core
UB-4 and 6 Prepared by
voltage outdoor copper 25 mm2 10 mm
the customer
cable UC-7 and 9 cable
UN-10 and 12
UA-1
Channel 2 Single-core
UB-4 Prepared by
voltage outdoor copper 4–25 mm2 5–10 mm
the customer
cable UC-7 cable
UN-10
IA*-31

IA-33 Prepared by
Channel 2
Single-core the customer
current IB*-34
outdoor copper 2–4 mm2 3–5 mm or supplied
transformer
IB-36 cable with current
cable
IC*-37 transformers
IC-39
RS485A-24 Two-core outdoor Supplied by
Communications 0.25–1.5
shielded twisted 4–11 mm the
cable mm2
RS485B-25 pair copper cable 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 0.9–1.1 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.

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


• 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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Current and Voltage Direct Connection (Current ≤ 80 A and Line
3.3 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 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


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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Connection Through Current Transformer and Voltage Direct
3.4 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 non-
SmartLogger 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
Connection Through Current Transformer and Potential
3.5 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)

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
Current
transformers details, see
section 4 "Display
and Parameter
Settings".

Cable inlet (IN)
UA UB UC

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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. Display Description

Positive active Negative active
1 energy 2 energy
= 10000.00 kWh = 2345.67 kWh
None parity,
8 data bits, 011 represents
3 and 1 stop bit; 4 address
baud rate = 9600 (default)
bps (default)
Phase B
Phase A voltage
5 6 voltage
= 220.0 V
= 220.1 V
Phase A
Phase C voltage
7 8 current
= 220.2 V
= 5.000 A
Phase C
Phase B current
9 10 current
= 5.001 A
= 5.002 A
Total phase active Phase A active
11 power = 3.291 12 power = 1.090
kW kW
Phase B active Phase C active
13 power = 1.101 14 power
kW = 1.100 kW
Total phase Phase A power
15 power factor 16 factor
PFt = 0.500 PFa = 1.000
Phase B power Phase C power
17 factor 18 factor
PFb = 0.500 PFc = –0.500


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4.2 Parameter Settings

No. Parameter Value Range Description

1 1–6553 Current transformer ratio

2 0.1–999.9 Potential transformer ratio

Communication protocol switchover:
1: 645
1: Factory mode
2: n.2
2: None parity, 2 stop bits, n.2
3 3: n.1
3: None parity, 1 stop bit, n.1
4: E.1
4: Even parity, 1 stop bit, E.1
5: 0.1
5: Odd parity, 1 stop bit, 0.1

4 1–247 Modbus communication address

Communication baud rate:
0: 1.200
0: 1200 bps
1: 2.400
1: 2400 bps
2: 4.800
5 2: 4800 bps
3: 9.600
3: 9600 bps
4: 19.20
4: 19200 bps
5: 115.2
5: 115200 bps

Wiring mode:
0: n.34
6 0: n.34, three-phase four-wire
1: n.33
1: n.33, three-phase three-wire

Rotation display time (s):
7 0–30 0: Fixed display
1–30: Time interval of rotation display

Backlight illumination time control
(minutes):
8 0–30 0: Steady on
1–30: Time of backlight illumination
without key operation

Channel switchover:
0: ct
9 0: Transformer connection
1: dc
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

1. Connect the cables correctly
1. The cable connection is incorrect.
No display after (see wiring diagrams).
2. The voltage supplied to the meter
power-on 2. Supply the correct voltage
is abnormal.
based on the specifications.

1. If the communication cable is
1. The RS485 communication cable is faulty, replace it.
disconnected, short-circuited, or 2. Set the communication
Abnormal reversely connected. address, baud rate, data bit,
RS485 2. The communication address, baud and parity bit of the meter to
communication rate, data bit, and parity bit of the be the same as those of the
meter do not match those of the inverter by pressing buttons.
inverter. For details, see "Parameter
Settings".
1. The cable connection is incorrect.
Check whether the corresponding
1. Connect the cables correctly
phase sequence of voltage and
(see wiring diagrams).
current is correct.
2. If a negative value is displayed,
Inaccurate 2. Check whether the high and low
change the cable connection
metering ends of the current transformer
for the current transformer to
inlet are reversely connected. If
ensure that the high and low
the values Pa, Pb, and Pc are
ends are connected correctly.
negative, the high and low ends
are connected incorrectly.

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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