njoy DTSU666 Smart Meter User Manual

njoy DTSU666 Smart Meter User Manual

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Please read this manual before using the product.

A Smart Meter is a bidirectional device that records the load curve and controls the various energy flows, giving highly accurate measurements and rapid communication through the chosen communication network.

nJoy inverter models that are compatible with this product:

Astris Series Grid-tied inverter
Three phase
6K/8K/10K/15K/25K

NOTE!
If any of the above package content is missing or is damaged please contact the shop where you have bought the product from.

Brief Introduction

Main application & applicable range

DTSU666 series three phase four wire and DSSU666 series three phase three wire electronic energy meter (din-rail) (hereinafter referred to as the “instrument”) is designed based on power monitoring and energy metering demands for electric power system, communication industry, construction industry, etc. as a new generation of intelligent instrument combining measurement and communication function, mainly applied into the measurement and display for the electric parameters in the electric circuit including three voltage, three current, active power, reactive power, frequency, positive& negative energy, four-quadrant energy, etc. Adopting the standard DIN35mm din rail mounting and modular design, it is characterized with small volume, easy installation and easy networking, widely applied into the internal energy monitoring and assessment for industrial and mining enterprises, hotels, schools, large public buildings.

Product Features

1. Characterized with positive and reverse active power, combined active power, combined reactive power, four quadrant reactive power metering and storage function with combination mode character can be set.
2. RS485 communication interface, easy to exchange data with outside;
3. Adopting the standard DIN35mm din rail mounting and modular design, it is characterized with small volume, easy installation and easy networking.

Product Model

Table 1 product model and specification

Model| voltage (V)| Current(A)| Impulse constant| Accuracy class
---|---|---|---|---
imp/kWh| imp/kvarh
DTSU666| 3×230/400| 1.5(6)A| 6400| 6400| Active Class 0.5S, Reactive Class 2
5(80)A| 400| 400| Active Class 1, ReactiveClass 2
DSSU666| 3×400| 1.5(6)A| 6400| 6400| Active Class 0.5S, Reactive Class 2
5(80)A| 400| 400| Active Class 1, Reactive Class 2

NOTE!

1.5(6)A is Connection through current transformers, 5(80)A is direct access.

Temperature range

Regulated working temperature range: -10°~C+45°C
Limited working temperature range: -25°C~+75°C
Relative humidity(Annually average): ≤75%
Atmospheric pressure: 63.0kPa~106.0kPa( altitude 4km and below), excepting the requirements for special orders.

Working Principle

The instrument are composed of high accurately integrated circuit specially for measurement (ASIC) and managing MCU, memory chip, RS485 communication module, etc.

Principle for the main function module

The special metering integrated circuit (ASIC) integrated six load two order ∑-Δ type of A/D conversion, please take the digital signal processing measured by the voltage circuit as well as all the power, energy, effective values, power factor and frequency. This metering chip can measure the active power, reactive power, apparent power, active energy, reactive power, apparent energy of each phase and combined phase, and at the same time measuring current, voltage effective values, power factor, phase angle, frequency and other parameters, entirely satisfying the needs of power meter. The chip provides an SPI interface, convenient for metering parameters as well as parameter calibration between the management MCU.

Main Technical Performance & Parameters

limit of error caused by the current augment

Table 2 The limit value of the active percentage error of meters on balanced load

Meters for| Value of current| Power factor| Percentage error limits for meters of class
---|---|---|---
0.5S| Class 1| Class 2
Connection throughcurrent transformers| 0.01In≤I<0.05In| 1| ±1.0| ±1.5| ±2.0
0.05In≤I≤Imax| 1| ±0.5| ±1.0| ±1.2
0.02In≤I<0.1In| 0.5L, 0.8C| ±1.0| ±1.5| ±2.0
0.1In≤I≤Imax| 0.5L, 0.8C| ±1.0| ±1.0| ±1.2
Direct connection| 0.05Ib≤I<0.1Ib| 1| –| ±1.5| ±2.0
0.1Ib≤I≤Imax| 1| –| ±1.0| ±1.2
0.01Ib≤I<0.2Ib| 0.5L, 0.8C| –| ±1.5| ±2.0
0.2Ib≤I≤Imax| 0.5L, 0.8C| –| ±1.0| ±1.2

NOTE!
In: secondary rated current of the current transformer; Ib: calibrated current of the meter;
L:inductive; C: capacitive;

Table 3 The limit value of the reactive percentage error of meters on balanced load

Value of current| sinφ (inductive or capacitive)| Percentage error limits for meters of class
---|---|---
Direct connection| Connection throughcurrent transformers| Class 2
0.05Ib ≤ I < 0.1Ib| 0.02In ≤ I < 0.05In| 1| ±2.5
0.1Ib ≤ I ≤ Imax| 0.05In ≤I ≤ Imax| 1| ±2.0
0.1Ib ≤ I < 0.2Ib| 0.05In ≤ I < 0.1In| 0.5| ±2.5
0.2Ib ≤ I ≤ Imax| 0.1In ≤ I ≤ Imax| 0.5| ±2.0
0.2Ib ≤ I≤ Imax| 0.1In ≤ I ≤ Imax| 0.25| ±2.5

Table 4 The limit value of the reactive percentage error of meters on balanced load

Value of current| Power factor| Percentage error limits for meters of class
---|---|---
Direct connection| Connectionthrough| 0.5S| Class 1| Class 2
0.1 Ib ≤ I ≤ Imax| 0.05In ≤ I ≤ Imax| 1| ±0.6| ±2.0| ±3.0
0.2Ib < I ≤ Imax| 0.1In < I < Imax| 0.5L| ±1.0| ±2.0| ±3.0

Table 5 The limit value of the reactive percentage error of meters on imbalanced load

Value of current| Power factor| Percentage error limits for meters of class
---|---|---
Direct connection| Direct connection| Class 2
0.1 Ib ≤ I ≤ Ima| 0.05In ≤ I ≤ Imax| 1| ±3.0
0.2Ib ≤ I ≤ Imax| 0.1In ≤ I ≤ Imax| 0.5L| ±3.0

Starting and no-load condition

Starting

Under the power factor of 1.0 and started current, the instrument can be started and continuously measure (for multiple phase instrument, it will bring balanced load). If the instrument is designed based on measurement for dual directional energy, then it is applicable for each direction of energy.

Table 6 start current

Test of no-load condition
When the voltage is applied with no current flowing in the current circuit, the test output of the meter shall not produce more than one pulse. For this test, the current circuit shall be open-circuit and a voltage of 115 % of the reference voltage shall be applied to the voltage circuits. The minimum test period Δt shall be

k is the number of pulses emitted by the output device of the meter per kilovarhour(imp/kvar x h); m is the number of measuring elements; Un is the reference voltage in volts; Imax is the maximum current in amperes.

Electrical parameters

Table 7 Electrical parameters

Main function

Displayed function

From the displayed interface, the electrical parameter and energy data are all primary side data (that is, the multiplied by current and voltage ratios). The energy measuring value will be displayed seven bits, with the displaying range from 0.00kWh to 9999999MWh.

=10000.00kWh
2| | Positive active energy =10000.00kWh
3| | Reserve active energy =2345.67kWh
4| | Protocol: DT/L645-2007 address = 000000000001
5|
(4)| | Protocol: MdoBus-RTU; address =001 Baudrate=9600 None parity, 2 stop bits
(5)|
6| | Phase A voltage =220.0V
7| | Phase C voltage =220.20V
9| | Phase A current =5.001A
10| | Phase B current =5.001A
11| | Phase C current =5.002A
12| | Combined phase active power =3.291kW
13| | Phase A active power =1.090kW
14| | Phase B active power =1.101kW
15| | Phase C active power =1.100kW
16| | Combined phase power factor PFt=0.500
17| | phase A power factor PFa=1.000
18| | Phase B power factor PFb=0.500
19| | phase A power factor PFc=-0.500

NOTE!
Protocol:DL/T645-2007 display 4 and 5, Protocol:Modbus-RTU display (4) and (5).

Programming function

Programming function

When the current is connected to the line via the transformer, Ct=the rated current of the primary loop / the rated current of the secondary circuit; When the current is directly connected to the line, Ct shall be set as 1.
| 0.1~999.9| 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.
| 1:645;2:n.2;3:n.1;4:E.1;5:O.1;| Settings for communication stop bit and Parity bits: 1: DL/T645-2007 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, O.1;
| 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;
| 1~247| Communication address
| 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.
| 0:no; 1:E| The setting is 1, representing the allowed instrument energy data clearance, which will be zero reset after clearing.
**| 0:P: 1:Q;2: S;| Pulse output:0: active energy pulse; 1: reactive energy pulse; 2: Others.
**| 0~30| Display in turns(second)0:Timely display; 1~30:Time interval of actual display.
****| 0~30| Backlight lighting time control(minutes)0: Normally light; 1~30: backlight lighting time without button operation

Programming operation

Button description: “SET” button represents “confirmation”, or “cursor shift” (when input digits), “ESC” button represents “exit”, “→” (“ ”) button represents “add”. The input code is (default 701).

Figure 3 Setting examples for current and potential transformer ratio.

Figure 4 Setting examples for communication address and Baud Rate

When input digits, “ ” can be used as cursor “ ”motion button; “ ” is “add” button, “ ”is Exit the programming operation interface or switch to the character interface from digit modification interface, add from the beginning after setting the digit to the maximum value.

Communication function

Characterized with a RS485 communication interface, the baud rate can be changed between 1200bps, 2400bps, 4800bps and 9600bps. It conforms to DL/T645-2007 or ModBus-RTU protocol.

Factory default communication parameters is DL/T 645-2007 protocol, the default baud rate is 2400bps, with the calibration bit and stop bit to be E.1 and instrument address (please see instrument factory number or crystal display screen).

Customized communication parameter is ModBus-RTU protocol, the baud rate is 9600bps, with the calibration bit and stop bit to be n.1, and the instrument address to be 1(according to the request).

Energy measurement function

The horizontal axis of the measurement plane represents the current vector I (fixed on the horizontal axis), and the instantaneous voltage vector is used to represent the current power transmission. Compared with the current vector I, it has phase angleφ. The counter-clockwise direction φangle is positive.

Figure 5 Measurement schematic diagram for energy four quadrants

Combined active energy=positive active energy + reverse active energy Combined reactive 1 energy=I+IVCombined reactive 2 energy=II+III.

Table 10 Installation size

Model| modulus| Outline size (length× width× height) mm| Installation size (din rail)
---|---|---|---
DTSU666| 4| 100×72×65| DIN35 din rail

Figure 5 Outline size diagram

Figure 6 current cable terminal (Conductor Cross-sectional Area Range ≤16 mm2)

Figure 7 RS485 cable terminal (Conductor Cross-sectional Area Range 0.25-1mm2 )

Installation and operation manual

Inspection Tips

When unpacking the carton, if the shell has obvious signs caused by severe impact or falling, please contact with the supplier as soon as possible.
After the instrument being removed from the packing box, it should be placed on a flat and safe plane, facing up, not overlaying for more than five layers. If not installed or used in a short time, the electric meter shall be packed and placed to the original packing box for storage.

Installation and tips

Installation and Inspection
If the model No or configuration in the original packing box is not in accordance with the requirement, please contact with the supplier. While, if the inner package or shell has been damaged after removing the instrument from the packing box, please do not install, power on the instrument, please contact with the supplier as soon as possible, instead.

Installation

It requires experienced electrician or professional personnel to install it and you must read this operation manual. During the installation, if the shell has obvious damage or marks caused by violent impact or falling, please do not install it or power on and contact with the supplier as soon as possible.

Typical wiring

Figure 10 Three phase four wire: direct connect

Figure 11 Three phase three wire: direct connect

Figure 12 Three phase four wire: via current transformer

Figure 13 Three phase three wire: via current transformer

Figure 14

Figure 15

• Voltage signal (only for connection via current transformer)

2——-UA (Phase A voltage input terminal)
8——-UC (Phase C voltage input terminal)
5 ——-UB (Phase B voltage input terminal)
10——-UN (Phase N voltage input terminal)

• Current signal:

1——-IA(Phase A current input terminal)
4——-IB(Phase B current input terminal)
7——-IC*( Phase C current input terminal)
3——IA (Phase A current output terminal)
6——IB (Phase B current output terminal)
9——IC(Phase C current output terminal)

• RS485 Communication wire

24——-A (RS485 Terminal A)
25——-B (RS485 Terminal B)

• Auxiliary function

19—— Active energy and reactive energy output high terminal
21—— Active energy and reactive energy output low terminal

NOTE!
In the Figure 10, 11, 12, 13, the L1, L2, L3 correspond to Phase A, Phase B, Phase C.

Diagnosis, analysis and elimination for common faults

1. Incorrect wiring
2. Abnormal voltage for the in-strument

|

1. If it is wrongly connected, please reconnect based on the right wiring mode (see the wiring diagram).
2. If the supplied voltage is abnor- mal, please choose the specified voltage.
3. If not the above problems, please contact with the local sup- plier.

Abnormal RS485 communication|

1. RS485 communication cable is opened, short circuit or reversely connected.
2. Address, baud rate, data bit and check bit is not in accordance with the host computer.
3. The end of RS485 communica- tion cable has not been matched with resistance (when the distance over than 100 meters)
4. Not matched with the commu- nication protocol order of the host computer

|

1. If there is any problem with the communication cable, please change it.
2. Set the address, baud rate, data bit and check bit through buttons and confirm it is the same with the host computer, then set the operation to be “parameter set- tings”.
3. If the communication distance is over than 100 meters, and the communication parameter set- tings are the same as the host computer, but cannot be com- municated, then please lower the baud rate or add a resistance of 120Ω at the start terminal and ending terminal.

Abnormal data for the electrical parameter (voltage, current, pow- er, etc.)|

1. The transformer’s ratio hasn’t been set, and the instrument dis- plays the secondary side data.
2. Wrong wiring.

|

1. If setting the transformer ratio, please set the voltage ratio and current ratio based on “parameter setting”
2. If wrongly connected, please connect the voltage and current of phase A, B and C to the wiring terminal of the instrument.

Abnormal data for the electrical parameter read by communication (voltage, current, power, etc.)|

1. Data read by communication is secondary side data, without transformer ratio.
2. Wrong analysis for data frame

|

1. Multiply the data read by com- munication with the voltage ratio and current ratio.
2. Analyze the data frame based on the format of the communica- tion protocol, please pay attention to the mode of the big and small end of data.

Transportation & Storage

When transporting and unpacking the products, please confirm they are not severely impacted, transporting and storing based on Transportation, basic environmental conditions and testing methods for instrument and meters of JB/T9329-1999.
The instrument and accessories shall be stored in the dry and ventilated places, to avoid humidity and corrosive gas erosion, with the limited environmental temperature for storage to be -40°C~+70°C and relative humidity not exceeding 85%.

Maintenance & Service

We guarantee free reparation and change for the multi-meter if found any unconformity with the standard, under circumstance of that the users fully comply with this instructions and complete seal after delivery within 18 months.

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