Thank you for using the products of Zhejiang CHINT Instrument & Meter Co., Ltd. In order to have a safe and correct use of the instrument, please read this manual carefully and make sure to pay attention to the following points in use:
- ➡️ This instrument must be installed and maintained by the qualified professionals;
- ➡️ The input signals and auxiliary power supply must be cut off before wiring of the instrument;
- ➡️ Make sure every part of the instrument without voltage by continuously using appropriate voltage detection device;
The following conditions will lead to the damage or abnormal operation of the device:
- Incorrect ratio setting of the instrument;
- Out of range of auxiliary power supply, voltage, current, frequency;
- Incorrect input polarity of current or voltage;
- The terminals are not connected according to the requirements;
1. Technical Parameters
Table 1
| Technical parameters | Index | |||
|---|---|---|---|---|
| 3 phase 3 wire(DSSU666-series) | ||||
| 3 phase 4 wire(DTSU666 series) | ||||
| Input signal | Voltage | Rated value | AC 3×380V; AC 3×400V | |
| 3 phase 3 wire | AC 3×220/380V; AC 3×230/400V | |||
| Operating voltage | 0.7Un—1.2Un | |||
| Consumption | ≤8VA/1W(per phase) | |||
| Resistance | >500KΩ | |||
| Current | Rated value | 3 phase 3 wire | AC 5(80)A | |
| 3 phase 4 wire | AC 1.5(6)A | |||
| Consumption | ≤1VA(per phase) | |||
| Resistance | <20mΩ(per phase) | |||
| Frequency | Input range: 45Hz~65Hz | |||
| Output | Display: LCD display | |||
| Active energy | Class1 | resolving power 0.01kWh | ||
| Class 0.5S | resolving power 0.01kWh | |||
| Reactive energy | Class 2 | resolving power 0.01kvarh | ||
| Class 2 | resolving power 0.01kvarh | |||
| Energy measurement | forward, reverse active energy, four-quadrant reactive energy. | |||
| Energy | Pulse constant | AC 3×380V; AC 3×400V | AC 6400imp/kWh(imp/kvarh) / 1.5(6)A | |
| AC 3×380V; AC 3×400V | AC 400imp/kWh(imp/kvarh) / 5(80)A | |||
| AC 3×220/380V; AC 3×230/400V | AC 6400imp/kWh(imp/kvarh) / 1.5(6)A | |||
Continued from Page 1:
| Pulse signal output | AC 3×220/380V; AC 3×230/400V | AC 400imp/kWh(imp/kvarh) / 5(80)A |
| Supply active, reactive energy optical signal and optocoupler collector open-circuit electrical signal impulse output, pulse length:80±16ms. | ||
| Auxiliary function | Protocol: Support MODBUS-RTU or DL / T645-2007 communication (switchable), Baud rate support 2400bps, 4800bps, 9600bps. | |
Note 1: The other performance index, indoor table reference IEC 62053 - 21 requirements.
2. Wiring Instructions
Diagram shows a terminal block with connections labeled 1, 3, 4, 6, 7, 9 for current input/output lines (L1, L2, L3), 2, 5, 8, 11 for voltage lines (L1, L2, L3, Neutral), 15, 16 for RS485 communication (A, B), and 20, 21 for impulse output (PQ-, PQ+).
Diagram shows a terminal block with connections labeled 1, 3, 4, 6, 7, 9 for current input/output lines (L1, L2, L3), 2, 5, 8 for voltage lines (L1, L2, L3), 15, 16 for RS485 communication (A, B), and 20, 21 for impulse output (PQ-, PQ+).
Diagram shows a terminal block with connections labeled 1, 3, 4, 6, 7, 9 for current input/output lines (L1, L2, L3), 2, 5, 8, 11 for voltage lines (L1, L2, L3, Neutral), 15, 16 for RS485 communication (A, B), and 20, 21 for impulse output (PQ-, PQ+).
Diagram shows a terminal block with connections labeled 1, 3, 4, 6, 7, 9 for current input/output lines (L1, L2, L3), 2, 5, 8 for voltage lines (L1, L2, L3), 15, 16 for RS485 communication (A, B), and 20, 21 for impulse output (PQ-, PQ+).
Current signal wire:
- 1-------L1*(phase L1 current input line)
- 3------L1(phase L1 current output line)
- 4-------L2*(phase L2 current input line)
- 6------L2(phase L2 current output line )
- 7-------L3*(phase L3 current input line)
- 9------L3(phase L3 current output line )
Voltage signal wire:
- 2-------L1(phase L1 voltage line)
- 5-------L2(phase L2 voltage line)
- 8-------L3(phase L3 voltage line)
- 11-------UN(Neutral line)
RS485 communication line:
- 15-------A(RS485-A)
- 16-------B (RS485-B)
Energy pulse output line:
- 20-------active, reactive energy pulse +
- 21------- Energy pulse –
3. Instructions of Programming Parameters
Instruction of keys: [Menu] means "confirm", [Esc] means "exit", [+] means "add". Input the password (assumed to be 701), enter the submenu item of “system settings" (when the system is set to third rows of digital display, the first row of hidden):
This figure illustrates a sequence of screen prompts for setting various parameters. It shows the display changing from "Power", "Measure", "Display" to "Menu", "code", "701" for system parameter setting. Subsequent screens show settings for "Potential Transformer Ratio" (UrALU-AL), "Current Transformer Ratio" (38-1), and "Meter Address or Baud rate" (Conn bAud Addr, showing values like 9600 and 3).
4. Installation Size
Table 2
| Model | Shell size (width×length×depth) | DIN rail for mounting |
|---|---|---|
| DTSU666-series DSSU666-series |
126mm×89mm×76mm | 35mm |
Diagram shows the front and side views of the energy meter. The front view displays dimensions of 126.00 mm (width) and 89.50 mm (height). It indicates terminal numbers (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 15, 16, 20, 21, 22, 23) and labels like "CHNT", "Digital Three-Phase Energy Meter", and compliance standards (GB/T, DL/T). Buttons labeled "Esc" and "Menu" are visible. The side view shows a depth of 76mm and a DIN rail mounting width of 35mm, with a dimension of 47.5mm shown.
5. Communication
Factory setting: DL/T 645-2007 protocol, Parity(E.1), Baud Rate(9600bps), Meter Address see lable.
The RS485 communication supports DLT 645-2007 protocol or ModBus_RTU protocol. DLT 645-2007 supports reading Meter Address, (current) total import active energy, (current) export active energy, (current)quadrants I reactive energy, (current)quadrants II reactive energy, (current) quadrants III reactive energy, (current)quadrants IV reactive energy, voltage, current, active power, reactive power, power factor, frequency.
ModBus_RTU protocol, Parity(n.2), Baud Rate(9600bps), Meter Address see lable.
Table 3 ModBus Register Address
| Parameter address | Parameter code | Instruction of the parameters | Type of data | Length of data Word | Read&write attributes |
|---|---|---|---|---|---|
| Keyboard parameters (detailed function see the instruction of the programming parameters, the actual value of the parameter with(*) = communication parameter value × 0.1) | |||||
| 0000H | REV. | version | signed int | 1 | R/W |
| 0001H | UCode | Programming password code | signed int | 1 | R/W |
| 0002H | ClrE | Electric energy zero clearing CLr.E(1:zero clearing) | signed int | 1 | R/W |
| 0003H | net | Selecting of the connection mode net(0:3P4W,13P3W) | signed int | 1 | R/W |
| 0004H | RESERVED | reserved | signed int | 1 | R/W |
| 0005H | RESERVED | reserved | signed int | 1 | R/W |
| 0006H | IrAt | Current Transformer Ratio | signed int | 1 | R/W |
| 0007H | UrAt | Potential Transformer Ratio(*) | signed int | 1 | R/W |
| 000BH | Meter type | Meter type | signed int | 1 | R |
| 002CH | Protocol | Protocol changing-over | signed int | 1 | R/W |
| 002DH | Addr | Communication address Addr | signed int | 1 | R/W |
| 002EH | bAud | Communication baud rate bAud | signed int | 1 | R/W |
| 002FH | Second | Second | signed int | 1 | R/W |
| 0030H | Minute | Minute | signed int | 1 | R/W |
| 0031H | Hour | Hour | signed int | 1 | R/W |
| 0032H | Day | Day | signed int | 1 | R/W |
| 0033H | Month | Month | signed int | 1 | R/W |
| 0034H | Year | Year | signed int | 1 | R/W |
Electric quantity of the secondary side
| Parameter address | Parameter code | Description | Type | Length | Attribute |
|---|---|---|---|---|---|
| 2000H | Uab | Line -line voltage, the unit is V (It is invalid for 3 phase 4 wire) | Floating | 2 | R |
| 2002H | Ubc | Floating | 2 | R | |
| 2004H | Uca | Floating | 2 | R | |
| 2006H | Ua | Phase-phase voltage, the unit is V (It is invalid for 3 phase 3 wire) | Floating | 2 | R |
| 2008H | Ub | Floating | 2 | R | |
| 200AH | Uc | Floating | 2 | R | |
| 200CH | Ia | The data of three phase current, the unit is A | Floating | 2 | R |
| 200EH | Ib | Floating | 2 | R | |
| 2010H | Ic | (Ib is invalid when three phase three wire) | Floating | 2 | R |
| 2012H | Pt | Conjunction active power, the unit is W | Floating | 2 | R |
| 2014H | Pa | A phase active power, the unit is W | Floating | 2 | R |
| 2016H | Pb | B phase active power, the unit is W (invalid when three phase three wire) | Floating | 2 | R |
| 2018H | Pc | C phase active power, the unit is W | Floating | 2 | R |
| 201AH | Qt | Conjunction reactive power, the unit is var | Floating | 2 | R |
| 201CH | Qa | A phase reactive power, the unit is var | Floating | 2 | R |
| 201EH | Qb | B phase reactive power, the unit is var (invalid when three phase three wire) | Floating | 2 | R |
| 2020H | Qc | C phase reactive power, the unit is var | Floating | 2 | R |
| 202AH | PFt | Conjunction power factor | Floating | 2 | R |
| 202CH | PFa | A phase power factor (invalid when three phase three wire) | Floating | 2 | R |
| 202EH | PFb | B phase power factor (invalid when three phase three wire) | Floating | 2 | R |
| 2030H | PFc | C phase power factor (invalid when three phase three wire) | Floating | 2 | R |
| 2044H | Freq | Frequency | Floating | 2 | R |
| 2050H | DmPt | Total active power demand | Floating | 2 | R |
| 401EH | ImpEp | (current)positive active | Floating | 2 | R |
| 4020H | RESERVED | total energy | Floating | 2 | R |
| 4022H | RESERVED | reserved | Floating | 2 | R |
| 4024H | RESERVED | reserved | Floating | 2 | R |
| 4026H | RESERVED | reserved | Floating | 2 | R |
| 4028H | ExpEp | (current)negative active total energy | Floating | 2 | R |
| 402AH | RESERVED | reserved | Floating | 2 | R |
| 402CH | RESERVED | reserved | Floating | 2 | R |
| 402EH | RESERVED | reserved | Floating | 2 | R |
| 4030H | RESERVED | reserved | Floating | 2 | R |
| 4032H | Q1Eq | (current) quadrant I reactive total energy | Floating | 2 | R |
| 4034H | RESERVED | reserved | Floating | 2 | R |
| 4036H | RESERVED | reserved | Floating | 2 | R |
| 4038H | RESERVED | reserved | Floating | 2 | R |
| 403AH | RESERVED | reserved | Floating | 2 | R |
| 403CH | Q2Eq | (current) quadrant II reactive total energy | Floating | 2 | R |
| 403EH | RESERVED | reserved | Floating | 2 | R |
| 4040H | RESERVED | reserved | Floating | 2 | R |
| 4042H | RESERVED | reserved | Floating | 2 | R |
| 4044H | RESERVED | reserved | Floating | 2 | R |
| 4046H | Q3Eq | (current) quadrant III reactive total energy | Floating | 2 | R |
| 4048H | RESERVED | reserved | Floating | 2 | R |
| 404AH | RESERVED | reserved | Floating | 2 | R |
| 404CH | RESERVED | reserved | Floating | 2 | R |
| 404EH | RESERVED | reserved | Floating | 2 | R |
| 4050H | Q4Eq | (current) quadrant IV reactive total energy | Floating | 2 | R |
| 4052H | RESERVED | reserved | Floating | 2 | R |
| 4054H | RESERVED | reserved | Floating | 2 | R |
| 4056H | RESERVED | reserved | Floating | 2 | R |
| 4058H | RESERVED | reserved | Floating | 2 | R |
All the electric quantity data read by the communication is quadratic numerical, the rate is excluded, complement numbers are the representation of negative numbers. Following is the detailed conversion method.
Conversion Method
Table 1
| Parameter name | Conversion formula | Unit | Parameter item |
|---|---|---|---|
| Voltage | U = URMS×(x=a、b、c)×(UrAt×0.1)×0.1 | V | Ua,Ub,Uc,Uab,Ubc,Uca |
| current | I = IRMS×(x=a、b、c)×IrAt×0.001 | A | Ia,Ib,Ic |
| Active power | P = Px(x=a、b、c)×(UrAt×0.1)×IrAt×0.1 | W | Pt,Pa,Pb,Pc |
| Reactive power | Q = Qx(x=a、b、c)×(UrAt×0.1)×IrAt×0.1 | var | Pt,Qa,Qb,Qc |
| Power factor | PF = PFx(x=a、b、c、t)×0.001 | PFa,PFb,PFc,PFt | |
| Frequency | F = Freq×0.01 | Hz | F |
| Energy | Ep = E× UrAt×IrAt | kWh kvarh |
ImpEp, ExpEp, Q1Eq, Q2Eq, Q3Eq, Q4Eq |
Note: When Potential Transformer(Pt) is 1, The value of UrAt is 10.
