Function:
1. On/off Switch
2. Time Relay Switch
3. Real voltage display on app
4. Real Current display on app
5. Real active power display on app
6. Kwh display on app
7. kwh prepayment function.
8. Over current protection, over and under voltage protection, Max power protection, min power protection.
9. RS485 port: MODBUS-RTU protocol, 1200～9600bps,None parity ,default 9600bps
1. General Description
DDS238-4 W type multi-function protective smart energy meter is designed to measure single phase two wire AC active energy and variable parameter. The meter have RS485 communication port and WIFI communication, it can use APP for remote reading and control on/off. All of its functions comply with the relative technical requirement for class 1 single phase watt hour meter in IEC62053-21 and its data communication rules obey the requirement of MODBUS-RTU and WIFI 802.11b/g/n.It is a long life meter with the advantage of high stability , high over load capability , low power loss and small volume .
The meter should be installed in suitable environment with ambient temperature range between
-25
℃
～+
55
℃
,the relative humidity less than 75% and temperature limits between and
-40
℃
～+
70
℃
.
The meter is manufactured complying with international standard IEC62052-11 on “Electricity metering equipment (AC) General requirements tests and test conditions” and IEC62053-21 on “Static meters for active energy (classes 1 and 2)”.
2.Specification and Technical Parameters
2.1Specification
|
Meter type |
DDS238-4 W VAP |
|
Rate frequency |
50 or 60 Hz |
|
Rated current |
5(60)A |
|
Rate voltage |
120V / 220V / 230V /240V (90～300V) |
|
Normal voltage range |
90%Un～110%Un |
|
Limits voltage range |
70%Un～120%Un |
|
kWh Accuracy |
Class 1 |
|
R.M.S accuracy |
Class 0.5 |
|
Pulse constant |
See meter |
|
RS485 port |
MODBUS-RTU protocol, 1200～9600bps,None parity ,default 9600bps |
|
WIFI |
802.11b/g/n ,only support 2.4GHz network , not support 5GHz network |
2.2 basic parameters
|
Delayed recovery after protection |
60s(default)1～512s |
|
overvoltage / undervoltage / overload event judgment time |
3s (default)0.1～60s |
|
Overvoltage protection value |
270V+1(default)，APP can set value |
|
Overvoltage recovery value |
260V+1(default)= (APP overvoltage value – 10V) |
|
Undervoltage protection value |
170V+1(default)，APP can set value |
|
Undervoltage recovery value |
180V+1(default)= (APP overvoltage value + 10V) |
|
Overload protection value |
65A (default)， 10～65A APP can set value |
|
Delay on/off control |
00:01—24:00 Hour |
Note: when it happens interrupt power-supply (power grid off ), the meter will not cut off , undervoltage event must last 3s , then it will cut off.
2.2 Technical Parameters
2.2.1
Basic tolerance
|
Load current(A) |
Power factor (CosΦ) |
Basic error(%) |
|
|
1.0 class |
2.0 class |
||
|
0.05Ib |
1.0 |
+1.5 |
+2.5 |
|
0.1Ib—Imax |
1.0 |
+1.0 |
+2.0 |
|
0.1Ib |
0.5(lag) |
+1.5 |
+2.5 |
|
0.8(advanced) |
+1.5 |
||
|
02Ib—Imax |
0.5(lag) |
+1.0 |
+2.0 |
|
0.8(advanced) |
+1.0 |
||
2.2.2
Self-consumption
Current circuit is less than 1.5VA
Voltage circuit is less than 2W/8VA
2.2.3
Starting current
Under the rated voltage , rated frequency and COSΦ=1 , the meter shall start and continue to register on application of 0.2% In (if CT is used) or 0.4% Ib .
2.2.4
A
nti-creeping
The meter has anti-creeping logical circuit. When 115%Un is connected to the meter and current circuit is cut , the meter shall not create more than one pulse in a stipulated time
2.2.5 A
verage-life
The meter can be used for at least 10 years in normal operation specified in this manual
2.2.6
LCD: 6+2 (999999.99kWh)
3.Basic Features
3.1 Measuring positive & negative active energy with negative energy accumulated into positive energy
3.2 The meter display total active energy, positive active energy , negative active energy , total reactive energy , balance active energy
3.3 The meter also display real voltage , real current , real active power , real power factor , real frequency
3.4 Pulse LED indicates working of meter，Pulse output with optical coupling isolation .
3.5 RS485 communication port and WIFI communication
3.6 Measuring active energy without calibration under long term operation
3.7 Display step by step with button
3.8 APP can display total active energy, balance active energy, real voltage , current ,active power
and remoter control on/off.
3.9 Hour/Day/Month/Year history active energy consumption tracking by APP
3.9 It has overvoltage and undervoltage protection , it can set value from APP and by button
Each protection function can be opened/closed as customer requirement
3.10 It has overload protection ,it can set value from APP
3.11 Voice control on/off function
3.12 Alarm event records on APP
3.13 Prepayment function, if balance energy used up. It will cut off automatic. This function can be opened/closed by APP
3.14 Energy data can store on memory chip when power off, it also still measure energy whenlose WIFI connection and it will update the energy on APP when connect WIFI again
3.15 It can control on/off by hand with button when prepayment function close
3.16 It has timing control function , it can set value from APP
3.17 It can reset the active energy to zero from APP
4.Working principles
Single phase voltage and current are sampled from respective sampling circuit and transformed into suitable signal, which is carried into integrated circuit , then the meter output pulse signal in positive appropriation to measured power to drive step-motor counter or LCD counter to realize energy measurement. The meter has energy pulse output for testing with pulse width of 80+20ms
9. Frame format
9.1 Read command（function code 03）
Send frame
|
Meter ID |
Function code |
Register address |
Data number |
Check code (CRC) |
|
1byte |
1byte |
2byte |
2byte |
2byte |
Receive frame
|
Meter ID |
Function code |
Data length n |
Data area |
Check code (CRC) |
|
1byte |
1byte |
1byte |
n byte |
2byte |
9.2 Write command（function code 10）
Send frame
|
Meter ID |
Function code |
Register address |
Data number |
Data length n |
Data area |
Check code (CRC) |
|
1byte |
1byte |
2byte |
2byte |
1byte |
n byte |
2byte |
Receive frame
|
Meter ID |
Function code |
Register address |
Data number |
Check code (CRC) |
|
1byte |
1byte |
2byte |
2byte |
2byte |
9.3 Energy meter register address
|
Register address |
Data number |
Data item |
Data format |
Data unit |
|
0x0000 |
2 |
Total kWh |
XXXXXX．XX |
kWh |
|
0x0001 |
||||
|
0x000C |
2 |
Reactive kvarh |
XXXXXX．XX |
kvarh |
|
0x000D |
||||
|
0x0008 |
2 |
Export kWh |
XXXXXX．XX |
kWh |
|
0x0009 |
||||
|
0x 000A
|
2 |
Import kWh |
XXXXXX．XX |
kWh |
|
0x000B |
||||
|
0x0016 |
1 |
Voltage |
XXX．X |
V |
|
0x0019 |
1 |
Current |
XX．XX |
A |
|
0x001E |
1 |
Active power |
XXX．XXX |
kW |
|
0x002B |
1 |
Power factor |
X．XXX |
|
|
0x0011 |
1 |
frequency |
XX．XX |
Hz |
|
0 x0033 |
1 |
Relay |
1 means power on, 0 means power off |
|
|
0x0015 |
1 |
ID + baud rate |
First byte is ID号，the second byte is baud rate，01~04 is means Respectively 9600、4800、2400、1200 |
|
Note 1: one register address is store 2 byte data ,so the data length read as 4 byte when data number is 2 .
Note 2:：you can use ID ID(0x00) to broadcast and got data when you do not know the meter ID. But this ways is only for 1 pcs meter to connection on RS485 wire
10. Display item
|
Uo |
Overvoltage protection value |
270V |
300 V |
100 V |
If the value exceed the range , the LCD will display off and closed this protection function |
|
UoH |
Overvoltage recovery value |
265 V |
300 V |
85 V |
This value must be smaller than overvoltage protection value. or it will default set as overvoltage protection value -5V when you save |
|
UL |
Under voltage protection value |
170 V |
300 V |
85 V |
If the value exceed the range , the LCD will display off and closed this protection function |
|
ULH |
Under voltage recovery value |
175 V |
300 V |
85 V |
This value must be smaller than under voltage protection value. or it will default set as under voltage protection value +5V when you save |
|
SU |
overvoltage / under voltage fault judgment time
|
3s |
60s |
0.1s |
It means the fault must be last how many times then it will make output load switch off when happen fault |
|
Io |
Over current protection value |
60A |
60 A |
1 A |
If the value exceed the range , the LCD will display off and closed this protection function |
|
SI |
Over current fault judgment time
|
3s |
60s |
0.1s |
It means the fault must be last how many times then it will make output load switch off when happen fault |
|
SH |
Delay time setting for recovery load after output load switch off protection |
60s |
512s |
1s |
It means the product must wait for how many times then make the output switch on again after happen protection |
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