EPM420 - wemakepowersmart
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1. 0 6535 o 0004H v23 LineRT volt 2bytes r6 0 655 o v 0005 Vat LineTRvolt 2bytes F 0 655 o v 00061 11 Phase Ramp 2bytes F7 0 655 o fa 00071 2 PhaseSamp 2bytes F7 0 655 o A 0008 15 PhaseTamp 2bytes Fo 0 655 o JA 0009H P KWiotal 2bytes FB 0 6535 o w oan O KVAR total 2bytes FB 0 655 o KW oon S KVAtotal 2bytes FB 0 6535 o KW ooocH f Hz 2bytes mo 0 ess o oop PF r 2bytes M 0 ess 10 DM323210 RD 6 2000 EPM420 Users Manual 38 Parameter reading Table 7 11 Function Code 03 ADDRESS FN RS Tone LENGTH FORMAT DEFAULT UNIT osin PT PT index NO 2bytes E 0 2 10 4 0082H CT CT index NO 2bytes B 0 32 0 Baud 0084H ae Baud rate 2 bytes F5 4 4 Bps DM323210 RD 6 2000 EPM420 Users Manual 39 Chapter 7 Appendix Format Table Table 7 12 Format Type Wiring table 1 for 3P3W 0 for 3P4W 0 1200 1 2400 2 4800 3 9600 4 19200 Data 10 ositive Data 100 Word h x 65536 word 10 ae l DM323210 RD 6 2000 EPM420 Users Manual2. EPM420 Multi Function Power Monitor V 2 0 DAETECH DAE INSTRU W E MAKE POWER SMART Table of Content Table of Content Introduction Product overview What is EPM420 Basic Introduction Measurement Principles System description Feature EPM SPECIFICATION Product structure Modular construction Analog module Power module Controller module Front panel Rear connection Button function Programming your meter EPM420set up PT Table CT Table Installation Initialization Topology Wiring Diagram Maintenance troubleshooting Preventive maintenance Troubleshooting Appendix Drawing Communication Protocol DM323210 RD 6 2000 EPM420 Users Manual COPY RIGHT INSTALLLATION AND MAINTENANCE WARRANTY AND ASSISTANCE NOTICE DM323210 RD 6 2000 Table of Content This Service Manual is copyrighted and all rights are reserved The distribution and sale of this manual are intended for the use of the original purchaser or his agents This document may not in whole or part be copied photocopied reproduced translated or reduced to any electronic medium or machine readable form without prior consent of Dae Instrument Inc except for use by the original purchaser Dae s products are designed for ease of installation and maintenance As with any product of this nature however such installation and maintenance can present electrical hazards and should only be performed by properly trained and qualified person
3. 2 and construction to increase pt index is same as above Note if PT primary side is 24000v secondary side is 120v the PT1 should Enter into 24000v the PT2 should enter Into 120V The FUN key increments the value Short presses increase the value step by step Holding and not releasing increases the value continuously and the incrementing rate accelerates over time step 4 PT 2 ratio setting Ptl primary value Pt2 secondary value The LED screen shows p t 2 and 120 a press FUN key to increase no refer attachment index till correct b press V A key to go to step 3 ex PT 4 PT ratio 110 c press V A key to shift to set pt 2 and construction to increase pt index is same as above Note if PT primary side is 24000v secondary side is 120v the PT1 should Enter into 24000v the PT2 should enter Into 120V The FUN key increments the value Short presses increase the value step by step Holding and not releasing increases the value continuously and the incrementing rate accelerates over time DM323210 RD 6 2000 EPM420 Users Manual DM323210 RD 6 2000 EPM 420 Ki I JC EPM 420 I 19 Step 6 Address ID no setting RS485 address setting The LED screen shows 4 ex ADDRESS ID no 4 the ADDRESS ID no could be 0 31 a press FUN key to increase id no till correct b press V A key to go to step 5 RS485 address 4 step 7 Baud rate setting The LED screen
4. and kilo VAR hours and the CT and PT ratio are used to calculate the primary units The Energy registers count to a maximum of 10000000 kWh before rolling over to zero It is the responsibility of the user to ensure that these values are read often enough to detect every rollover The Frequency measurement is generated by timing zero crossings of the Phase A Voltage Phase A B over a period of 0 6 seconds Knowing the number of zero crossings and time between them the frequency can be calculated A rolling average of two measurements helps to reduce the fluctuations in the measurement The input voltage must be greater than 10Vac for the frequency function to determine a value The Power Factor measurements require a secondary side of CT current of minimum 0 25Aac and a secondary side of PT voltage approximately 50Vac to determine an accurate answer If the input signals are below these values the power factor ready will be displayed at 1 00 EPM420 Users Manual Chapter 2 System Description 2 System Description All measured quantities available over the digital communications channel to SCADA or PLC systems O Push button rescaling in the field accommodates all ANSI CT and PT ratios displays the primary values e Non volatile memory backup of CT PT settings energy readings communication settings No batteries are needed O Separate second microprocessor to off load the main processor O Standard Universal power supply works o
5. please check the instrument for shipping damage as itis unpacked Notify Dae instrument immediately if any damage has occurred and save any damaged shipping containers Power requirements EPM series Meter are normally equipped with universal AC DC power supplier After power are connected to 110 or 220 volts the monitor will light up for operation Over current protection A UL listed 0 5 Ampere non time delay M fuse is to be series connected in the ungrounded hot side of mains input as part of installation of this product Mains disconnect The Disconnect shall be UL Recognized and acceptable for the application Instrument mounting Instrument mount in DIN 144 x 144 see figure 7 1 7 2 Surge protection It is recommended that a metal oxide varistor MOV be placed across the power supply input to protect the meter in the event of high voltage surges or lightning strikes EPM Meters are shipped with a transient suppression network already attached as a standard design An MOV provides an added measure of protection against heavy switching transients occasionally experienced in the field The MOV is designed to clamp applied power voltages above 270 V ac RMS A single MOV protects the meter Line to Line and two high voltage capacitors are provided to protect each Line to Ground To avoid damaging the MOV protector maintain continuously applied power voltages within the ratings of the instrument Setting instrument The Meters require an ad
6. shows 4 ex Baud rate ID 10 4 a press FUN key to increase baud rate ID no till correct ex bps 4 baud rate 19200 bps step 8 Return to step1 or exit The LED screen shows End a press V A key to return to to step 1 b or b press BOTH of FUN and V A key simultaneously to exit set up mode and return into display mode EPM420 Users Manual 20 Chapter 4 Programming your meter Table 4 4 Baud Rate Setting Table DM323210 RD 6 2000 EPM420 Users Manual 21 Chapter 4 Programming your meter Operation 3p4W Voltage current and total harmonic vi 2 v3 v12 23 v31 Phase R current Phase S current Phase T current Other Power Function SYMBOL requenc Press the FUN button Press the FUN button o Kvah lt DM323210 RD 6 2000 EPM420 Users Manual 3p3W Voltage current and total harmonic Other Power Function 22 Chapter 4 Programming your meter SYMBOL DEFINITION LED DISPLAY Press the V A button V12 Line RS voltage 23 Line ST voltage V31 Line TR voltage Phase R current Phase S current Phase T current SYMBOL DEFINITION LED DISPLAY Apparent power Press the FUN button requenc p o Kvarh import DM323210 RD 6 2000 EPM420 Users Manual 23 Chapter 5 Installation 5 Installation Initial Initial inspection Instruments are carefully checked and turned in at the factory before shipment Damages can occur however so
7. 2 1 to 3 3 mm is recommended for all current connections It s recommended that CTs comply with the requirements in IEC 61010 1 Pollution Degree 2 Overtage Category IIL The CT primary rating is normally selected to equal to the current rating of the power feed protection device However if the peak anticipated load is much less than the related system capacity you can improve accuracy and resolution by selecting a lower related CT In this case the CT size should be the maximum expected peak current rounded up to the nearest standard CT size The Ct secondary should have burden capacity greater than 3VA The length of the CT cabling should be minimized because long cabling contributes to the burden on the CT secondary Also the CT burden rating must exceed the combined burden of the meter plus cabling plus any other connected devices burden is the amount of load being fed by the CT measured in Volt Amps 1 RS 485 connections are made via the captured wire connectors on the meter Up to 32 devices can be connected on a single RS 485 cable 2 The Rs485 cable should be adopted AWG62 0 33mm or larger twisted pair with shidded wire 3 The RS485 cable should be adopt twisted pair with shidded wire to avoid electric noise 4 The overall length of the RS485 cable connecting all devices cannot exceed 1200m 5 The polarity of RS485 connecting link must be correct or any error in any element of this link will occur the system confusing
8. 3 1 Power Function List Kv or V PT ratio 1 low voltage the uint is V PT ratio other value mideum or high voltage the unit is Ky V1 V2 V3 are uesd when in 3 phase 3 wire Hi Phase Reurrent fAmp 2 Phase S current Amp e B o Phase Teurrent Amp PT pS Realpower KworMw IJPT ratio gt 1000 the unit is Mw jQ Kvar KworMw E TPowerfactor PP E Kwh import o jaakuh Eo Kvarhimpot jaakuh ps DM323210 RD 6 2000 EPM420 Users Manual Rear Connection 15 Chapter 3 Product Structure Aux Power and Communication terminal AC aux power Power Button function Measurement Terminal Display Mode Setting Mode Choose the power function Increase the setting parameter Change the measurement of Confirm the setting current or voltage Press the two button at the same time to enter into setting mode DM323210 RD 6 2000 EPM420 Users Manual 16 Chapter 4 Programming your meter 4 Programming your meter The Meters can display several per phase and total guantities for the circuit being monitored This allows the simultaneous display of all phases for a given quantity such as AMP The parameter ITEM LED display at the right side of the instrument prompts the user as to what quantity is being displayed While this chapter will construct you step by step to learn how to operate meters Please refer the attachment table o
9. 6 The setting of all elements must be the same ie baud rate 8 n 1 7 The address of RS485 must not be repeated 8 All the element in RS485 must adopt the same communication protocols 9 It should be set proper rolling interval and time out in central computer software 10 After system wiring prepare to test It should adopt the testing EPM420 Users Manual DM323210 RD 6 2000 software of DAE Instrument for simplifying the complexity of troubleshooting EPM420 Users Manual 26 Topology Loop Topology Straight Line Topology DM323210 RD 6 2000 RS232 RS485 27 Chapter 5 Installation Pa a EN H oe eco m s n ve EPM450 Monitor Tower box EPM450 EPM450 m m Ez H E E oo H ce H oe EPM450 EPM450 EPM450 Monitor El El E EPM450 Tower box EPM450 EPM450 H oc oo EPM450 EPM420 Users Manual EPM450 EPM450 28 Chapter 5 Installation Wiring Diagram 3 wire 2 Delta a 2PT 2CT s k EPM 3W Direction PIDO BW 9 0 DM323210 RD 6 2000 EPM420 Users Manual 29 Chapter 5 Installation 3P3W 3 Wire Delta 2 PTs and 3 CTs EPM 3P4W PIDO BW oo DM323210 RD 6 2000 EPM420 Users Ma
10. 7 2 Message Frame Format Function Field B 3 Function field B 3 1 Function Codes Table 7 3 01 Read DO Status Obtain current status of 02 Read DI Status Obtain current status of 03 Read Data Obtain current binary value in A ee 5 Control DO Force DO to a state of on or off Preset Single Register Place a specific binary value into a Single Register 16 Preset Place specific binary values Multiple Registers into a series of consecutive Multiple Registers DM323210 RD 6 2000 EPM420 Users Manual DM323210 RD 6 2000 B 3 2 Read Data Function Code 03 Query 34 Chapter 7 Appendix This function allows the user to obtain the measurements of EPM TABLE 3 2 is an example to read the 3 measured data U1 U2 and U3 from slave device number 17 the data address of U1 is 0000H U2 is 0001H And U3 is 0002H Table 7 4 AA ICRC low Table 3 2 Read UU1 U2 and U3 Query Message Response The EPM response includes the slave address function code quantity of data characters the data characters and error checking An example response to read Ul U2 U2 03E7H U3 03E9H is shown as Table3 3 Table 7 5 Byte count Data register high Data register low Data register high Data register low Data register high Data register low ICRC high ICRC low Table 3 3 Read U1 U2 andU3 Message B 3 3 Preset Reset Multi Register Function Code 16 EPM420 Users Manual and U3 U1 03E8H 35 Chapter 7 App
11. apter 1 Introduction Watts VARs Instantaneous Watt samples are accumulated for 0 4 seconds at which time the MCU calculates the Watts and Vas for each phase The VARS quantity for DM323210 RD 6 2000 EPM420 Users Manual Energy Frequency Power factor DM323210 RD 6 2000 each phase is derived from a power triangle calculation where the WATTS and Vas are known This technique provides a true measure of VARs even with distorted waveforms Zero offset is slow adjusted for each signal channel every 0 4 seconds by the MCU These per phase quantities are then summed to form the total three phase WATTS and VARS Once the WATTS and VARS have been calculated the MCU scales the values by the external PT and CT ratios which have been selected by the user and displays the primary values The WATT and VAR values are calculated every 0 4 second These values are then multiplied by a factor in order to generate Watt hours and VAR hours The sign of the Watt hours and VAR hour values are then checked and the values are then added to the appropriate registers Positive Negative WATThours VARhours In order to retain the energy values during a power failure the registers must be stored in the EEPROM in the base of the instrument The EEPROM has a limited number of write cycles so the energy are only written every 90 seconds At this rate the EEPROM will last in excess of 15 years at rated conditions The registers are in primary kilowatt hours
12. dge rectifier and converts AC power inputs to DC The output of the switching supply is then post regulated by a low drop linear regulator to provide precise supply voltage control under all conditions The total load required to operate is only 3 5VA It is therefore possible to po the EPM Series Meter with AC or DC station power or an auxiliary PT or batte Working power The meter are designed in Aac or Vac in power input 110 or 220volts and the supply terminal is designed in the upper left side of rear panel terminal 1 and 2 In order to assure the operation of meter monitoring the power supply of the meter should separately set especially in low voltage for the working power should maintain its good electric quality and the monitored power may be harmful electric quality In applying high voltage the meter can directly connected to 110 or 220 Aac volts for the working power supply Controller module Analog processing The function of analog processing is to sample and digitize the micro controller MCU for further processing Calibration constants stored in the analog module EEPROM to provide drift free calibration and complete interchangeability of analog processing Master The master micro controller consists of an 16 bit micro controller address micro controller memory and a watchdog timer All the data acquisition signal processing manipulation are controlled by this micro controller Communications to n other boards
13. discussed Although reasonable care has been taken to provide accurate and authoritative information in this document no responsibility is assumed by DAE INSTRUMENT for any consequence arising out of the use of this material EPM420 Users Manual Chapter 1 Introduction 1 Introduction Product overview Current and voltage as well as real and reactive power are essential TAA quantities which must be measured accurately in order to optimize the control and delivery of electric power The use of state of the Art microprocessor technology assures digital accuracy and repeatability across a wide range of input signal levels EPM series are rugged electronic instruments designed for utility and industrial applications requiring standard The meters are modular in design with push button rescaling to display primary values when using any standard current and voltage transformer Rescaling can be done in the field in a matter of minutes without removing the instrument from the panel or the need for any calibration equipment EPM series also provides the user with the capability to connect directly with Modbus RTU protocols This capability allows users to seamlessly integrate the meters into an existing or planned SCADA or PLC What is EPM420 Basic EPM420 multi function digital power monitoring meter is one kind of Introduction full function intelligent power monitoring instruments These devices not A only provide all requirements in powe
14. dress to be set within the instrument before any address communications can begin Address could be set by front panel keyboard a display Refer to the appropriate protocol option manual for address setup instructions setting 3p3w or 3p4w The meters combined 3p3w or 3p4w configuration in the same unit user mode must set the right configuration correspondence with it s wiring Wiring the PT and CT CT connections input The polarity of wiring and sequence of correspondence is very important The mis wiring with PT will result in that the reading of power and power factor is not correct DM323210 RD 6 2000 EPM420 Users Manual Field adjustments Calibration Field Service Consideration Feature Pack Requirements Terminal Strips Connecting the Base Unit Safely Ground Connecting the Power Supply External PT DM323210 RD 6 2000 24 Chapter 5 Installation PROPERLY TRAINED OR QUALIFIED PERSONNEL SHOULD ONLY PERFORM WARNING INSTALLATION amp MAINTENANCE Routine recalibration is not recommended or required However some drift or aging may cause slight errors after years of use If the mater requires servicing or field upgrading you may need to disconnect and remove the meter from its mounting The initial installation should be done in a way that makes this as convenient as possible All phase voltage sense leads should be protected by breakers or fuses at their source so that the meter can be safely disc
15. e any anxiety in security but there will some problems in reading errors And it must be noted that When connecting PTs or CTs all kind of protecting and prevent measures must be adopted to stave off the burning out of equipments The meter have power of MOV confirming ANSI IEEE C57 13 13 1983 Chapter 3 Product Structure The meter have the isolated communicational interface of RS485 in the upper right side of the rear panel The internal CT in the meter provides good function of isolation and meter protection and simultaneously avoids that the monitored equipment open circuit result in melt and electric accident The internal I O capability uppers to 1500 volts EPM420 Users Manual 12 Internal potential The potential transformer PT contain secondary transformers which transformer provide electrical isolation for each of the signal input channels Voltage from the PT terminal flows though a internal PT to assure that the user s external PT circuit can never open circuit even under extreme fault conditions The use of transformer isolation on all input leads provides excellent isolation gt 1500Vac between the inputs and any output Power module Switching power The meters have a universal power supply as a standard feature The Supply universal power supply is a high efficiency high frequency switching power supply with integrated over current protection Power from the input terminals is conducted to a full wave bri
16. endix Query Function 16 allows the user to modify the contents of a Multi Register Any Multi Register that exists within the DPM can have its contents changed by this message The example below is a request to slave number 17 to Preset Ep 178077833KWH data address 0040H Table 7 6 Table 3 4 Reset KWH Query Message Response The normal response to a preset Multi Register request includes the slave address function code data start reg the number of regs and error checking Table 7 7 Table 3 5 Reset KWH Response Message DM323210 RD 6 2000 EPM420 Users Manual 36 Chapter 7 Appendix Energy Measurement Table 7 8 Format unsigned 16 bit Funtion Code 03H Address 40001 Kam K lt AN LENGTH FORMAT am DEFAULT UNIT cn 4 bytes 100000000 0 1Kwh KE MAASI EN 0044H ES 4 bytes import al y F11 100000000 0 1Kwh 0045H eds import H Parameter Setting Table 7 9 Function code 16 ADDRESS Bene ae ONO LENGTH FORMAT DEFAULT UNIT wt ESE oom a CC CC ossi Pr Prao 2bytes 7 0 A Due s 0 A o DM323210 RD 6 2000 EPM420 Users Manual 37 Chapter 7 Appendix Analog Measurement Table 7 10 Funtion Code 03 ADDRESS ea ER IS LENGTH FORMAT MAX DEFAULT UNIT 0000H Vi PhaseRvolt 2bytes Fo o 655 o v 000 H v2 PhaseSvolt 2bytes re o 655 o 0002H V3 PhaseTvolt 2bytes r6 o 6535 o 0003 V12 Line RS volt 2bytes r6
17. equipment of PLC via PLC integrating to be a large scale of automatic system Measurement All the quantities measured by the Meters instrument utilize digital signal Princ ip les processing DSP technique This technique allows the instrument to measure a large number of quantities with a small amount of hardware It also allows field upgrades since the signal processing algorithms are in an EPROM and can be simply updated to provide new features The following section will give a brief overview of the measurement principles Voltage Current signal processing begins with the low level AC signal supplied from the power board which is about 1 Vac RMS for a full scale input signal Pure sine wave inputs or complex distorted periodic waveforms are handled equally well a major advantage when computing Watts and Vars As well as true RMS currents and voltages This design frees the user from concern about errors which will otherwise occur during the measurement of distorted waveforms Phases A B and C are samples in succession providing the MCU with instantaneous measurements of all voltage and current inputs Samples are accumulated for 1 seconds at which time the MCU calculates the Volts and Amps for each phase Any Zero Offset or drift is compensated every calculation cycle Once the Volts and Amps have been calculated the MCU scales the values by the external PT and CT ratios which have been selected by the user and displays the values Ch
18. eter from the panel or to remove the meter from service The analog module consists of the input and power connector the initial current transformer analog circuit communication transceiver input protection circuitry instrument potential transformer EEPROM The meters provide for complete interchangeability among analog module and controller modules Compensation for normal variations in input circuits is achieved by storing calibration constants in a non volatile memory EEPROM which resides on the PC board These constants are factory programmed to provide identical signal gain attenuation in each of the six isolated signal input paths The CT and PT settings for scaling the display to the user s CTs and PTs are also stored in this EEPROM The Energy Registers are also stored in this EEPROM Detailed descriptions of each of the boards can be found in the following sections The EPM420 have 10 independent signal input 6 current and 4voltage for each phase being measured The signal input of voltage and current are directly connected to the rear panel of the meter in 10 32 AWG The meter can be connected directly to CTs or PTs and can directly connected if the voltage is lower than 600 volts The internal of CT and PT have a feature of low burden rate so that it almost no loading effects on the secondary value of PT and CT It must be paid attention that the polarity and order sequence in PT or CT input The wiring error will not caus
19. f PT CT ratio index while in set up mode ee m 1 mo lt mP mk ps J k ma 1 we e lt Button function Setting Mode Increase the setting parameter Confirm the setting Press the two button at the same time to enter into setting mode DM323210 RD 6 2000 EPM420 Users Manual EPM420 set up DM323210 RD 6 2000 17 Chapter 4 Programming your meter Setting mode User can follow procedures step by step to set scaling factor communication ID number and Baud rate selection 9600 or 19200bps Step 1 Enter into set up select wiring mode a Press BOTH of FUN and V A key IOOC simultaneously enter into set up mode JI b Press FUN key to select the password PAIPA 1 value LJL IL IL Note Press V A key to confirm the password if the password is correct the screen will change to step 2 otherwise the screen will stay at step 1 EPM 420 Step 2 Select 3p3 or 3p4 The LED screen shows y ire and select 3 or 4 where 3 means wiring mode is 3p3w 4 means wiring mode 3p4w a press FUN key to toggle change 3p3 or 3p4 b press_V A key to go to step 2 ex 3 means 3p4w EPM420 Users Manual 18 step 3 PT 1 value setting Ptl primary value Pt2 secondary value The LED screen shows p t 1 and 24000 a press FUN key to increase no refer attachment index till correct EPM 420 b press V A key to go to step 3 ex PT 4 PT ratio 110 c press V A key to shift to set pt
20. g used connect the line supply wire to the AC terminal and the neutral supply wire to the AC terminal If a DC power supply is being used connect the positive supply wire to the L terminal and the negative supply wire to the N terminal PTs are required for all systems with voltage levels greater than those indicated in Voltage Input specification 6 4 EPM420 Users Manual Time to adopt the external PT The Security of External PT Voltage Input Connection Voltage Reference Vref Input Connection Connecting External CT The Choice of External CT RS 485 Communication Connection DM323210 RD 6 2000 25 Chapter 5 Installation When the voltage exceeds the range it needs external PT It s recommended that PTs comply with the requirements in IEC 61010 1 Pollution Degree 2 Category II The meter uses the V1 input as the reference for frequency measurements For any system configuration the V1 input must be connected to ensure accurate readings and correct operation of the meter If the voltage on V1 falls below 50V the meter s accuracy could be affected The meter voltage reference terminal Vn serves as the zero voltage reference for the voltage reading A good low impedance Vref connection is essential for accurate measurements It should be made using a dedicated AWG 14 to 12 wire 2 1 to 3 3 mm to the point where there will no voltage error due to distribution voltage drops AWG 14 to 12 wire
21. hat the users of EPM420 can observe the measurement reading directly To be a high reliable power instrument there are two key factors to be concerned being able to operate in high temperature and owning a long life span These two factors are what LED advantage Compared with LED LCD would like to deteriorate when constantly operating in high temperature As a result Led is adopted Simple Installation EPM420 is the installation of DIN144 x 144 The depth of this device is only 7cm so that it s just needed very shallow space to use There are some brands limited in this so the display mode and module must be take apart This will result extra cost in installation In proportion to EPM420 the installation of EPM2420 is much easier Digital EPM420 provides Isolated RS 485 communication and communicational communication rate up to 19200bps being able to intensify communication response time between the meter and the computer At the same time EPM420 provide quite great ability of telecommunication response being able to order the computer send the measuring value back in 125 msec It is very important to the users who want to have rapid datacommunication response when using many meters This device adopts Modbus Rtu communicational protocol conscientiously and carefully designed reliable linked with most monitoring software easily and needless to design extra interface reducing cost This device also can be connecting to PLC being slave
22. ion Keyboard Saved in EEPROM no parameters are required to maintain data PT CT table select ratio RS 485address Baud rate Isolation Photo isolation 2500 Vrms Address Up to 32 EPM420 per line Baud rate up to 19200 bps Distance 4000 ft Protocol Modbus RTU mod Front panel 1P41 UL94 Terminal IP20 Operating 20 70 deg C Terminal IP20 Dimension 144 144 90mm Weight 1kg TEC 1EC870 1EC801 4 ANSI ANSI 37 9 TEEE 472 SWC UL UL94 Input output ground 2500 vac between any input and output 2800vac between I O and ground 500M ohm between any I O and case Input 115 230 V 20 AC or DC Consumption 3 5 VA Frequency 50 60Hz Table 2 1 EPM420 Users Manual 11 Chapter 3 Product Structure 3 Product Structure Modular construction Analog module Input signal connections Communication connector Internal CT DM323210 RD 6 2000 The EPM Series Meters are composed of three major modules The analog module and controller module and power supply module The analog module is installed at backside while controller module at the front side the power module is attached by analog module The analog Module contains passive parts transformers connectors etc and cannot be serviced without removal from the panel The controller consists of the analog and digital Processing dual Micro controller and the LED Displays This module can easily be removed for maintenance without the need to remove the m
23. is accomplished via a serial data link consisting of three Ii common to all the other devices Slave The micro controller consists of an 8 bit micro controller address latch EPR micro controller memory dual port ram This processor performs all the front panel operation communication functions Utilized this slave processor can share the load of n processor to enhance the response speed The dual port RAM for pass messag between master and slave micro controller in order to service operator s I display and data communication function DM323210 RD 6 2000 EPM420 Users Manual 13 Chapter 3 Product Structure EEPROM The meter configuration and data max demand max current happen time can be preserved in EEPROM even loss of power LED display The LED Display sets consist of three 4 digit displays comprised of high efficiency red LED seven segment common cathode displays Each 4 digit display is driven in a multiplexed fashion by an seven segment decoder driver chip which accepts serial data from the slave processor and decodes the data into seven segment and digit select outputs necessary for the multiplexed display An driver provides the high current cathode drive for each pair of digits DM323210 RD 6 2000 EPM420 Users Manual 14 Chapter 3 Product Structure Front Panel Power Function List This list displays system measurements Each of the line show different Display measurement measurement reading Table
24. n AC or DC service 110v or 230V True RMS measurements are standard DIN size 144 144 enclosures 0 4 digits by 3 lines high efficiency LEDs for easy reading e Watchdog timer maximizes system reliability Feature EPM SPECIFICATION Voltage inputs Current inputs Rating Max Overload Sensing method Rating Overload Sensing method 120vac 400vac L N 600 VAC Max between L L 400VAC Max between L N 2 x rating continuous True RMS 5 Amps with 20 over range 15 Amps continuous 250 Amps for 1 sec non recurring True RMS Frequency Range 40 100 Hz 0 2 VA Low Burden PT Burden CT Burden 0 2 VA Power measurement Line voltage Per phase Phase voltage Per Phase 3p4w only Current Per phase 3 phase total f PF KW KVAR Energy total Kwh Kvarh import and export Accuracy Current and voltage 0 5 FS 0 2 FS optional Other power functions 1 FS 0 5 optional Frequency 0 1Hz Microprocessor Microprocessor 16 bit low power MPU 32K byte non volatile RAM 4K bit EEPEROM Display Data display 3 lines of 4 digits data LED display Power parameter 18 LED display Update time 0 5 sec Auto scaling Available DM323210 RD 6 2000 EPM420 Users Manual User configuration parameters Isolated RS485 communication Seals Environment Dimension amp weight Standards apply Isolation Insulation Power supply Measuring range DM323210 RD 6 2000 Setting Parameter setting 10 Chapter 2 System Descript
25. nel All Dae s Multifunction instruments are warranted for on year against defects in materials and workmanship under normal use and service Obligation part or parts which Dae s examination should be defective There are no other warranties obligations liabilities for consequential damages or other defective materials or work workmanship The warranties of merchantability and fitness for a particular purpose are expressly excluded Read these instruction carefully and look at the equipment to become familiar with the device before trying to install operate or maintain it The following special message may appear throughout this bulletin to warn of potential hazards or to call attention to information that clarifies or simplifies a procedure Used where there is hazard of serious injury of death Faiture to follow a DANGER instruction will result in deeath or serious injury Used where there is hazard of serious injury or death Failure to follow a WARNING instruction can result in death or injury EPM420 Users Manual PLEASE NOTICE DM323210 RD 6 2000 CAUTION Used where there is hazards of equipment damage Failure to follow a CAUTION instruction can result in damage to equipment Electric equipment should be serviced only by qualified maintenance personnel and this document should not be viewed as sufficient for those who are not otherwise qualified to operate service or maintain the equipment
26. nual 30 Chapter 6 Maintenance Troubleingshooting 6 Maintenance Troubleshooting Preventive Cleaning the exterior of the instrument shall be limited to the wiping of the maintenance instrument using a soft damp cloth applicator with cleaning agents that are not alcohol based and are nonflammable non explosive Troubleshooting In this section we bring up some poentail problems that you would like to meet and provide the check or cure for these prblems If after completing the listed checks you still can t solve the problem connect the DAE INSTRUMNET for assistance Problem Possible Cause After applying The EPM420 is not receiving the necessary power control power to the Check or Cure EPM420 the display Verify that EPM420 AC1 and AC2 terminal terminal 25and 27 are receiving is still black the necessary power Problem Possible Cause The data displayde is Incorrect setup values inaccurate or not Check or Cure what you expected Check to see that the correct value have been entered for EPM420 setup parameter CT and PT rating Wiring Type and so on See Programming your meter in Chapter 4 Possible Cause EPM420 is wired improperly Check or Cure Check the CTs and PTs are connceted correctly proper polarity observed and energized Check shorting terminals Possible Cause Incorrect voltage input Check or Cure Check EPM420 voltage input terminals terminals Va Vb Vc Vn to verify that ade
27. onnected ACT shorting block should be provided so that the meter current inputs can be safely disconnected without open circuiting the CTs The shorting block should be wired so that protective replaying is not affected All wiring should be routed to allow easy removal of all connections to the meter terminal strips and the meter itself A minimum of 63 5 mm 2 5 above and below the meter should be left free from cables wiring and other devices All connections to meter are made to terminal strips at the back of the unit The terminal strips for phase voltage and current are barrier type for which ring or spade terminals or bare wire may be used The terminal strips for the communications port and the supply power inputs are all captured wire type they accept stripped wire ends The T terminal of the meter provides the safety ground connection This terminal must be connected to earth ground A good low impedance safely ground connected is essential for the meter surge and transient protection circuitry to function effectively It should be made to the switchgear each ground using a dedicated AWG 14 2 1mm or larger wire The meter requires a constant power supply to maintain monitoring analysis control and communications operations Powering the meter from the voltage source it is monitoring is not suitable for applications where these operations must be maintained in envent of a power outage If an AC power supply is bein
28. quate voltage is present Problem Possible Cause Cannot communicte EPM420 address is incorrect with EPM420 from a Check or Cure remote personal Check to see that EPM420 is correctly addressed computer Possible Cause EPM420 baud rate is incorrect Check or Cure Verify that the baud rate of EPM420 match the baud rate of all other devides on it s communications link Possible Cause DM323210 RD 6 2000 EPM420 Users Manual Chapter 6 Maintenance Troubleingshooting Communicating lines are improperly biased Check or Cure Check to see that a multipoint communications link terminator is properly installed DM323210 RD 6 2000 EPM420 Users Manual 32 Chapter 7 Appendix 7 Appendix Drawings Figure 7 1 Panel cutting 133 133 Unit mm Figure 7 2 Appearance EPM 420 E A E 70 133 O O l i k 1472 le es Unit mm DM323210 RD 6 2000 EPM420 Users Manual 33 Chapter 7 Appendix B Communication protocol Modbus RTU protocol EPM420 communication can has two 485 ports optional contact the factory B 1 Transmission mode The mode of transmission is the structure of the individual units of information within a message and the numbering system used to transmit the data The mode is defined in the following which is compatible with Modbus RTU Mode Table 7 1 Coding System tart bit Data bits SY arity top bit rror checking B 2 Framing Table
29. r measurement but also solving the problem of the complicated traditional wiring and commission EPM420 greatly simplify the traditional complicated electric power automation wiring and commission and replace the related component such as Transducers and RTUs EPM420 is basic crucial equipment essential for the modernization of power automation system Measuring Function EPM420 can measure 3 phase voltage and 3 phase current with kW Kr pf kWh kvarh simultaneously and updated the measurement reading every 0 4 sec It can be operated no matter in 3 phase 3wire or 3 phase 4 wire The users can set the parameter such as PT ratio CT ratio wiring form to fulfill the different requirement through front panel to use different wire forms in different wire mode Measuring Accuracy This device is calibrated fully by digital system and there is no variable resistance provided to be adjusted The calibration factor is storage in EEPROM and needless to readjust in 3 years To order to increase the accuracy of measurement adjusting parameter in 3 phase 4wire and 3 phase 3wire are separately measured and storage in their own memory register The current input minimum great than 0 35A threshold value otherwise will cause the PF measurement incorrect DM323210 RD 6 2000 EPM420 Users Manual 1 2 Chapter 1 Introduction Operator Interface In order to provide clear display of measurement reading in long distance EPM420 adopt LED in large size So t
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