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31

4.2 Measurement algorithm

4.2.1 Harmonic

Total  Harmonic  Distortion  (THD)  is  the  current  detection  of  waveform  distortion.  The 

calculation method is divided into fundamental wave and true RMS value, which is the ratio 
of harmonic content to fundamental wave or true RMS value. The calculation formula of 
voltage/current total harmonic distortion is:

Fundamental (THD-F):

Current Total Harmonic Distortion:

Voltage Total Harmonic Distortion:

Ture RMS(THD-R):

Current Total Harmonic Distortion:

Voltage Total Harmonic Distortion: 

4.2.2 Demand

This  meter  is  consist  of  several  types  of  demand  calculation:  active  power  demand, 

reactive  power  demand,  apparent  power  demand,  three  phase  current  demand  and 
average current demand. The calculation method is as follows:

When  using  the  sliding  block  interval  method,  user  selects  an  interval  from  1  to  60 

minutes, which is the period of the calculation. The demand updates every 1 minute as the 
block slides once. The following example is a figure for 15-minute block interval:

4.2.2.1 Sliding Block

Summary of Contents for AEM-DRB

Page 1: ...AEM DRB Multi Circuit Power Meter DIN rail Operation Manual 41454d445242 4d 454e 53 41 Rev 1 0 2021 02 26 41454d445242 4d 454e 53 41 ...

Page 2: ...ronment 10 3 1 2 Remind 10 3 2 Basic Test 11 3 3 Wiring Instructions 12 3 3 1 Wiring Diagram 12 3 3 2 Communication Property 16 Chapter 4 Operations 17 4 1 General Operations 17 4 1 1 Reading Measured Data 17 4 1 1 1 Summary Search 17 4 1 1 2 Metering Search 17 4 1 1 3 Power Parameter Search 18 4 1 1 4 Alarm Search 19 4 1 2 Data Clear Reset 19 4 1 3 Power Meter Info Search 20 4 1 4 USER PASSWORD 2...

Page 3: ...nergy Type 26 4 1 7 4 Pre Divider 26 4 1 7 5 High Time 26 4 1 8 Energy Unit 26 4 1 9 Date Time 27 4 1 9 1 Backlight Time 27 4 1 9 2 Date 27 4 1 9 3 Time 27 4 1 9 4 Operation Hour Reset 27 4 1 9 5 Running Hour Reset 28 4 1 10 Demand 28 4 1 10 1 Mode 28 4 1 10 2 Period 28 4 1 11 Input Output 28 4 1 11 1 Digital Input 28 4 1 11 2 Relay Output 29 4 1 12 Initial 30 4 2 Measurement algorithm 31 4 2 1 Ha...

Page 4: ...Setting 38 4 5 6 Holiday Setting 38 4 5 7 Holiday schedule 39 4 5 8 Weekend Schedule 39 4 5 9 Demand 39 4 5 10 TOU Settlement 39 Chapter 5 Message of Abnormal Operations 40 5 1 Common malfunction analysis 40 5 1 1 Power meter dosen t work after it s electrified 40 5 1 2 Voltage or current reading in incorrect 40 5 1 3 Power or power factor reading is incorrect but voltage and current are correct 4...

Page 5: ...ve gases and flammable gases When wiring please follow the wiring diagram to explain the construction The grounding project must be implemented and the grounding must be carried out in accordance with the current state Do not dismantle the meter or change the wiring while power is on Do not touch the power supply during power on operation to avoid electric shock If you still have problems using it...

Page 6: ...ipment current transformer must not be under an open circuitaa When using the equipment please make sure current transformer for secondary side has been locked on the equipment To avoid the main trunk line falling off during use causing equipment damage When used with a current transformer CT please use a current transformer CT that meets UL2808 in the United States Canada and use a current transf...

Page 7: ... 20 350V AC L N for this device a potential transformer must be used with the device For the wrong forced pull out of the wire re check the connecting wire and start again Disconnect all wiring or power off all other circuits that may present potentially hazardous voltage levels to the unit when cleaning the power meter Ensure to use a dry and soft cotton cloth to wipe the surface of the power met...

Page 8: ...n 3 CT 3 PT Three phase three wire Δ Delta connection 2 CT No PT Three phase four wire Y connection 1 CT 3 PT Three phase three wire Δ Delta connection 1 CT No PT Three phase four wire Y connection 3 CT No PT Three phase three wire Δ Delta connection 3 CT 2 PT Three phase four wire Y connection 1 CT No PT Voltage Line voltage 600 VAC L L Phase voltage 400 VAC L N Current 1A 5A 333mV Frequency 45 6...

Page 9: ... E UP key Electromagnetic compatibility Electrostatic discharge IEC 61000 4 2 2008 Immunity to radiated fields IEC 61000 4 3 2006 A1 2007 A2 2010 Immunity to fast transients IEC 61000 4 4 2012 Immunity to impulse waves IEC 61000 4 5 2014 A1 2017 Conducted immunity IEC 61000 4 6 2013 COR1 2015 Immunity to magnetic fields IEC 61000 4 8 2009 Immunity to voltage dips IEC 61000 4 11 2004 A1 2017 Radiat...

Page 10: ...d return to the previous page LEFT None Long press for 2 seconds to abandon input or return to the previous page UP Summary page switching key Select item or increase number DOWN Summary page switching key Select item or decrease number 2 3 1 Interface Tree Display UI interface tree ...

Page 11: ...7 Setting UI interface tree ...

Page 12: ...8 2 4 Physical Dimensions Rear view Unit mm ...

Page 13: ...9 Output and Input RS485 Communication Port Pulse Output Max Distance 1200M Terminate Resistance 120 300Ω 0 25W typical 150Ω AC85 264V EMC Filter 1A Fuse ...

Page 14: ...away from the environment containing corrosive gas and liquids It is best to properly store in a rack or countertop Suitable installation environments for this product include places where there is no high heat device locations where there is no water droplets vapors dust and oily dust places where there is no corrosion flammable gas liquids and where there is no floating dust and metal particles ...

Page 15: ...he connection part of the wiring terminal The communication wiring should be correct otherwise abnormal actions may occur Check for conductive or flammable objects such as screws or metal plates inside the meter When the electronic instrument used near the meter is subjected to electromagnetic interference adjust the instrument to reduce electromagnetic interference Please make sure the meter s su...

Page 16: ... this equipment can carry must use an external voltage transformer PT 4 Measuring current Measuring the current requires the use of an external current transformer CT The recommended wiring material is as follows Terminal Block Wire gauge Screw torque Wire temperature resistance Branch loop current RS 485 AWG 28 14 2 04 kgf cm 0 2 N m 70 or higher Aux power Measured voltage RO DI PO Main loop curr...

Page 17: ...ase three wire Δ Delta connection 3 CT 2 PT Three phase three wire Δ Delta connection 2 CT 2 PT Three phase three wire Δ Delta connection 1 CT 2 PT Main loop CT secondary is 333mV signal Three phase three wire Δ Delta connection 3 CT 2 PT Three phase three wire Δ Delta connection 2 CT 2 PT Three phase three wire Δ Delta connection 1 CT 2 PT ...

Page 18: ...ee wire Δ Delta connection 1 CT No PT Main loop CT secondary is 333mV signal Three phase three wire Δ Delta connection 3 CT No PT Three phase three wire Δ Delta connection 2 CT No PT Three phase three wire Δ Delta connection 1 CT No PT Main loop CT secondary is 5A signal Three phase four wire Y connection 3 CT 3 PT Three phase four wire Y connection 1 CT 3 PT ...

Page 19: ...hase four wire Y connection 1 CT 3 PT Main loop CT secondary is 5A signal Three phase four wire Y connection 3 CT No PT Three phase four wire Y connection 1 CT No PT Main loop CT secondary is 333mV signal Three phase four wire Y connection 3 CT No PT Three phase four wire Y connection 1 CT No PT ...

Page 20: ...nected stations 32 Data Bit 8 Communication Protocols MODBUS RTU Parity None Odd Even Functional Code 03 06 10 Stop Bit 1 2 Communication property of RS 485 must use twist pair The communication property D terminal of all devices needs to be connected to the same twisted pair the D terminal needs to be connected to another twist pair the isolation net ground treatment and the terminal equipment ne...

Page 21: ...ncluding VLLavg Iavg Psum PFavg Summary P Specify loop of summary the measurement parameters the parameters to be displayed on this page can be set by yourself Press ENTER key enter the system menu and select the Metering then press ENTER key again to enter Press LEFT key return to previous page First select the loop you want to search including main loop A main loop B loop A 1 3 loop A 4 6 loop A...

Page 22: ...nic and return previous page Demand Measurement Parameter of demand measured by the power meter including P Q S I1 I2 I3 lavg MAX MIN parameters including Phase Voltage Line Voltage Current Power Frequency Power Factor THD F of Voltage THD F of Current Power Demand Current Demand In the MAN MIN parameters page press UP key for 2 sec to switch the parameters on the same page and the time stamp of t...

Page 23: ...p B 3 loop B 4 loop B 5 loop B 6 loop B 7 loop B 8 loop B 9 loop B 10 loop B 11 loop B 12 Select the parameter you want to clear which contains All recorded values but does not contain MAX demand values all energy value all demand value all maximum demand value all MAX MIN value active energy reactive energy apparent energy current demand active power demand reactive power demand apparent power de...

Page 24: ... 2CT 3P3W2CT three phase three wire 3CT 3P3W3CT three phase four wire 1CT 3P4W1CT three phase Four wire 3CT 3P4W3CT The factory value is three phase four wire 3CT 3P4W3CT Steps of setup are as follows 1 Press ENTER key on the menu page to enter wire system setting 2 Press UP or DOWN key to select the loop to be set and press ENTER to enter 3 Press UP or DOWN to select the wire system method 4 Pres...

Page 25: ...s 600 V Steps of setup are as follows 1 Press ENTER key on the menu page to enter the volt of PT primary setting 2 Press UP or DOWN key to select and set the voltage value of loop A or loop B or the voltage unit of the PT primary and press the ENTER key to enter 3 Press UP or DOWN key to select the numeric 4 Press LEFT key to move to the next digit 5 Repeat step 3 to 4 until finishing volt setting...

Page 26: ... as follows 1 Press ENTER key on the menu page to enter password setting 2 Press UP or DOWN key to select the numeric 3 Press LEFT key move to the next digit 4 Repeat step 2 to 3 until finishing 4 digits press ENTER key to save and return to the previous menu Press LEFT key and hold 2 seconds to cancel input and return to the previous menu 4 1 5 6 Default Page Default Page On the default page of t...

Page 27: ...etting 9 Press UP or DOWN key to select the parameter position to be set press ENTER key to enter 10 Press UP or DOWN key to select the parameter to be displayed at that position 11 Press ENTER key to finish setting and return to the previous menu 12 Press ENTER key to enter screen rotation time setting 13 Press LEFT key and move on to the next digit 14 Press LEFT key move to next digit of second ...

Page 28: ...rotocol is Modbus TCP The default IP address is 192 168 1 250 and DHCP is preset to automatic mode Steps of setup are as follows 1 Press ENTER key on the menu page to enter DHCP setting 2 Use UP and DOWN key to select enable or disable 3 Press ENTER key to finish setting and return to the previous menu 4 Press ENTER key to enter IP Address setting 5 Press UP or DOWN key to select the IP Address nu...

Page 29: ...he previous menu 4 1 7 Pulse Output 4 1 7 1 Test Pulse 4 1 7 2 Target Loop Set the test pulse output function is enabled or disabled because the default value is disabled The pulse output is fixed at 3200 Pulse 1kWh and the duty cycle is 50 Steps of setup are as follows 1 Press ENTER key on the menu page to enter test pulse setting 2 Use UP and DOWN key to select enable or disable 3 Press ENTER ke...

Page 30: ...ss ENTER key to save and return to the previous menu Press LEFT key and hold 2 seconds to cancel input and return to the previous menu Pulse output high level time setting the setting range is 0 5000 mS 0 means 50 duty of the high and low level The default value is 0 Steps of setup are as follows 1 Press ENTER key on the menu page to enter high time setting 2 Press UP or DOWN key to select the num...

Page 31: ...igit 4 Repeat step 2 to 3 until finishing 8 digits setting of date press ENTER key to save and return to the previous menu Press LEFT key and hold 2 seconds to cancel input and return to the previous menu Time setting The selectable range is 00 00 00 23 59 59 Steps of setup are as follows 1 Press ENTER key on the menu page to enter the time setting 2 Press UP or DOWN key to select the numeric 3 Pr...

Page 32: ...ct demand mode 3 Press ENTER key to finish setting and return to the previous menu Press LEFT key to cancel input and return to the previous menu The meter has two digital input uncluding DI1 DI2 In addition to being Digital Input the functions of the digital input port can also be set up as Demand Reset MAX Demand Reset Energy Reset MAX MIN Reset Relay Reset The default value is DI Trigger level ...

Page 33: ...ue is Relay Output In alarm mode the relay Active Delay Time can be set the range is 0 5999 x 0 1S and the default value is 0 The alarm conditions for each set of relay output ports can be set in 12 groups including Alarm Mode Loop Object Set Point The alarm action modes for relays include Low High Low and Hold High and Hold and Off When set to action and hold mode the DI needs to be set as a rela...

Page 34: ...NTER key to enter set point setting 21 Press UP or DOWN key to select the numeric 22 Press LEFT key move to the next digit 23 Repeat step 21 to 22 until finishing all digit setting of set point press ENTER key to save and return to the previous menu Press LEFT key and hold 2 seconds to cancel input and return to the previous menu 4 1 12 Initial Recover the power meter to factory default value The ...

Page 35: ...tal Harmonic Distortion Ture RMS THD R Current Total Harmonic Distortion Voltage Total Harmonic Distortion 4 2 2 Demand This meter is consist of several types of demand calculation active power demand reactive power demand apparent power demand three phase current demand and average current demand The calculation method is as follows When using the sliding block interval method user selects an int...

Page 36: ... of the corresponding parameter from the address of 0x5100 0x514F Please refer to the setting range marked in the communication address table for the address range that can be set For example When 0x5000 is written to 0x1001 high byte address of V1 voltage of main loop A 0x5001 is written to 0x1002 low byte address of V1 voltage of main loop A the value obtained by reading 0x5100 and 0x5101 is the...

Page 37: ...1 3 Reactive power 15 Branch Loop A1 3 Apparent power 16 Branch Loop A1 3 Power factor 17 Branch Loop A1 3 Import active energy 18 Branch Loop A1 3 Import reactive energy 19 Branch Loop A1 3 Apparent energy 20 Branch Loop A4 6 Current 21 Branch Loop A4 6 Active power 22 Branch Loop A4 6 Reactive power 23 Branch Loop A4 6 Apparent power 24 Branch Loop A4 6 Power factor 25 Branch Loop A4 6 Import ac...

Page 38: ...1 Branch Loop B1 3 Import reactive energy 62 Branch Loop B1 3 Apparent energy 63 Branch Loop B4 6 Current 64 Branch Loop B4 6 Active power 65 Branch Loop B4 6 Reactive power 66 Branch Loop B4 6 Apparent power 67 Branch Loop B4 6 Power factor 68 Branch Loop B4 6 Import active energy 69 Branch Loop B4 6 Import reactive energy 70 Branch Loop B4 6 Apparent energy 71 Branch Loop B7 9 Current 72 Branch ...

Page 39: ...r R W 0x4014 1 INT16U 1 23 Month R W 0x4015 1 INT16U 1 31 Day R W 0x4016 1 INT16U 0 23 Hour R W 0x4017 1 INT16U 0 59 Minute R W 0x4018 1 INT16U 00 59 Second R W 0x4019 Date and time for stop 1 INT16U 2020 2099 Year R W 0x401A 1 INT16U 1 23 Month R W 0x401B 1 INT16U 1 31 Day R W 0x401C 1 INT16U 0 23 Hour R W 0x401D 1 INT16U 0 59 Minute R W 0x401E 1 INT16U 00 59 Second R W 0x401F Logging enable 1 IN...

Page 40: ...ill be based on first in first out principle of circular coverage When cyclic overwriting occurs the earliest recorded data will be overwritten sequentially Therefore user are advised to read and save the entire data record before it is full to prevent data loss When the contents of the record parameters have been changed then all the records will not be reserved be retained and start recording fr...

Page 41: ... tariff sharp peak valley and normal User can customize the TOU calendar including its tariffs seasons schedules and segments according to different applications To make sure that the TOU calendar is setup correctly the meter will check the TOU settings according to the predefined rules TOU function will be disabled if the TOU calendar is set up incorrectly If no errors are found in the calendar a...

Page 42: ...d as a production error This parameter corresponds to the number of tariffs available for the TOU calendar and can be selected from any integer from 0 to 3 The four tariffs sharp peak valley and normal are represented by 4 integers 0 1 2 and 3 respectively This parameter can be set from any integer between 0 and 20 meaning a maximum of 20 holidays can be programmed to the TOU calendar If the holid...

Page 43: ...hen the meter clock is within the Weekend Schedule the energy will accumulate under the tariff that corresponds to the Schedule Note Weekend schedule s priority is followed by Holiday schedule When Holiday schedule is not enabled Weekend schedule has the highest priority overriding the normal weekday schedule 4 5 7 Holiday schedule The holiday schedule uses the same format as the TOU seasons MM DD...

Page 44: ...tage potential transformer PT and current transformer CT are intact Compare the voltage and current input of the inter wiring and wiring diagram to check whether the phase relationship is correct Check the communication baud rate ID and communication protocol setings of the upper machine are consistent with the meter Please check whether the data bit stop bit check bit settings are consistent with...

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