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Network analyzer

M4M 20

M4M 20-M

User manual

M4M 20

User manual 2CSG4

450

32D0201

Содержание M4M 20

Страница 1: ...Network analyzer M4M 20 M4M 20 M User manual M4M 20 User manual 2CSG445032D0201 ...

Страница 2: ......

Страница 3: ...10 3 6 Technical data 11 4 Measurement method 16 4 1 Vector registration method 16 5 Installation 17 5 1 Assembly M4M 20 17 5 2 Disassembly M4M 20 18 5 3 Disassembly M4M 20 18 5 4 Wiring diagrams 19 6 Access to device 25 6 1 Homepage 25 6 2 Navigation symbols 26 6 3 Notification icons 26 6 4 Overview of menu displays 27 6 5 Data entry 28 6 6 Favourite page 29 7 First commissioning 30 7 1 Setting l...

Страница 4: ...arms 46 8 5 Communication 48 8 6 Other settings 51 9 Data Reading 53 9 1 Realtime 54 9 2 Energy 55 9 3 Power Quality 56 9 4 Average 57 9 5 Min Value 58 9 6 Max Value 59 9 7 I O 60 9 8 Notifications 60 9 9 Power outages 63 9 10 Timers 64 10 Graphs 65 11 Maintenance 66 4 M4M 20 NETWORK ANALYZER USER MANUAL ...

Страница 5: ...nstallation Check that the voltage supply and measurement are compatible with the range permitted by the device Ensure that all current and voltage supplies are disconnected prior to carrying out any controls visual inspections and tests on the device Always assume that all circuits are under voltage until they are completely disconnected subjected to tests and labelled Disconnect all of the power...

Страница 6: ...product the network its system and interfaces against any kind of security breaches unauthorized access interference intrusion leakage and or theft of data or information ABB S p A and its affiliates are not liable for damages and or losses related to such security breaches unauthorized access interference intrusion leakage and or theft of data or information Although ABB S p A provides functional...

Страница 7: ...om low voltage Grap hs Data Read ing Con figu ratio n Network analyzer INSTALLATION MANUAL M4M 20 2CSG445030D0201 July 2019 Warning Installation by person with electrotechnical expertise only Warnung Installation nur durch elektrotechnische Fachkraft Avvertenza Fare installare solo da un elettricista qualificato 1 Packaging Content Network analyzer M4M 20 Installation manual Calibration certificat...

Страница 8: ...ing torque 13 Product code 2 Calibration date 14 Serial number 3 Current 15 Voltage inputs 4 Frequency 16 Protection class II Cat III 5 3 element metering 17 Cable strip 6 2 element metering 18 Notified body 7 1 element metering 19 Caution possibility of electric shock 8 Import Export 20 Auxiliary supply 9 MID and year of verification 21 Digital output connection 10 MID certificate number 22 RS485...

Страница 9: ...port Power quality THD I VLN VLL Neutral current Calculated Data recording and logs Single alarms 25 Warnings alarms and errors logs Demand values average Basic Advanced Basic Min Max Demand values Basic Advanced Basic HMI Graphs visualization Basic Notifications Homepage and favourite page Password protection Connectivity Automatic integration in ABB Ability EDCS Bluetooth Low Energy Communicatio...

Страница 10: ...gital Outputs Modbus TCP IP Bluetooth M4M 20 M ETHERNET 2 Digital Outputs Modbus TCP IP Bluetooth M4M 20 PROFIBUS 2 Digital Outputs Profibus DP V0 Bluetooth M4M 20 I O 2 Programmable I O 2 Digital Outputs 2 Analogue Outputs Modbus RTU Bluetooth M4M 20 ROGOWSKI 2 Digital Outputs Modbus RTU Bluetooth M4M 20 BACNET 2 Digital Outputs BACnet IP Bluetooth 3 5 Overall dimensions 96 mm 96 mm 57 mm 75 5 mm...

Страница 11: ...HD Current voltage Class 1 acc to IEC 61557 12 Voltage measurement inputs Measurement range V 46 80 480 830 V Measurement category 400V CAT III Rated frequency Hz 50 60 Hz Max VT secondary indirect connection V 400 VAC L N Max over voltage V 800 VAC L L Protection fuse V T1 A 277 VAC The M4M voltage inputs have a high impedance which decreases power consumption and increases security due low curre...

Страница 12: ... Digital Output Voltage min max 5 240 VAC DC Current min max 2 100 mA Max ON state drop voltage 1 5 V Max R value at Min voltage conditions 5 V 1750 Ohm Min R value at Max voltage conditions 240 V 2400 Ohm Pulse duration ms 20 ms ON 20 ms OFF Pulse frequency 25 Hz Alarm activation delay s 1 900 s programmable Alarm return hysteresis 0 40 programmable Digital Input Maximum Voltage 240 VAC DC Max vo...

Страница 13: ...ed wire 0 2 2 5 mm2 AWG 24 12 Pitch 7 62 mm Poles 4 Current inputs Nominal cross section 2 5 mm2 Solid stranded wire 0 2 2 5 mm2 AWG 24 12 Pitch 5 08 mm Poles 6 Screw flanges for fixing RS 485 Serial port Nominal cross section 2 5 mm2 Solid stranded wire 0 2 2 5 mm2 AWG 24 12 Pitch 5 08 mm Poles 3 I O Nominal cross section 2 5 mm2 Solid stranded wire 0 2 2 5 mm2 AWG 24 12 Pitch 5 08 mm Poles 3 Pro...

Страница 14: ... 3 pole terminal Profibus DP V0 M4M 20 Profibus Protocol Profibus with slave DP V0 function in compliance with IEC 61158 regulations Communication interface RS485 with optical isolation Baud rate Automatic detection 9 6k 12 Mbps Address 0 126 Connector DB 9 female connector do not use connectors with 90 cable outlet LED indicators Green for communication status Red for communication error Modbus T...

Страница 15: ...pe of network and rated voltage 3Ph 4W 3CT 3Ph 3W 2CT 1Ph 2W 1CT 3 x 230 400 3 x 400 690 V Current rating I min I ref Imax 0 01 1 6 A Rated frequencies tolerance 50 Hz and 60 Hz 2 Active Energy accuracy class Class C Electromagnetic ambient conditions Class E2 Mechanical ambient conditions Class M1 LED indicator pulse frequency 200000 imp kWh LED indicator pulse length 1ms ...

Страница 16: ...phases are L1 1 kW L2 1 kW and L3 1 kW The total power will then be 1 1 1 1 kW and the total import register will increase at a rate of 1 kWh each hour and the total export register will stand still If the power in the three phases instead are L1 1 kW L2 1 kW and L3 1 kW the total power will be 1 1 1 1 kW and the total export register will increase with the rate of 1 kWh each hour and the total im...

Страница 17: ... USER MANUAL 17 5 Installation 5 1 Assembly M4M 20 Sealing of terminal block for M4M 20 M MID M4M 20 M MID In order to ensure antitampering for MID directive sealing of terminal block is mandatory 1 2 3 4 1 2 3 click Sealing ...

Страница 18: ...MANUAL 5 2 Disassembly M4M 20 5 3 Disassembly M4M 20 In order to remove the terminal block please use a screwdriver in the dedicated area and turn it Please notice that if seal is broken tampering of M4M for MID will happen 1 1 2 2 3 ...

Страница 19: ...n and the cabling of the device must be carried out by qualified personnel Danger of electrocution burning and electirc arc Use the personal protection devices suitable to adhere to the current regulations governing electrical safety Prior to carrying out any connections check the sectioning of the electirc supply with the voltage detection device M4M 20 connection M4M 20 MODBUS connection M4M 20 ...

Страница 20: ...20 M4M 20 NETWORK ANALYZER USER MANUAL M4M 20 ETHERNET connection M4M 20 M ETHERNET connection M4M 20 PROFIBUS connection M4M 20 I O connection M4M 20 ROGOWSKI connection M4M 20 BACNET connection ...

Страница 21: ...ce According to the type of network that has been chosen the parameters visualized on the device HMI change Below the wiring diagrams for M4M 20 working with CT 5A or 1A M4M 20 M4M 20 Modbus M4M 20 Ethernet M4M 20 I O M4M 20 Profibus M4M 20 Bacnet M4M 20 M Modbus M4M 20 M Ethernet are shown 3 phase 4 wire network with 3CTs ok for MID on N4M 20 M 3 phase 4 wire network with 1CT 3 phase 3 wire netwo...

Страница 22: ...rder to ensure antitampering for MID directive only MID compliant wiring have to be selected and sealing of terminal block is mandatory Wiring diagrams M4M 20 Rogowski Below the wiring diagrams for M4M 20 working with Rogowski coils M4M 20 Rogowski are shown 3 phase 4 wire network with 3RogCTs IR1 IR2 IR3 L1 L2 L3 N AUX 3 phase 4 wire network with 1RogCT IR1 IR2 IR3 L1 L2 L3 N AUX ...

Страница 23: ...R1 IR2 IR3 L1 L2 L3 N AUX 3 phase 3 wire network with 3RogCTs IR1 IR2 IR3 L1 L2 L3 N AUX 3 phase 3 wire network with 2RogCTs IR1 IR2 IR3 L1 L2 L3 N AUX 2 phase 3 wire network with 2RogCTs IR1 IR2 IR3 L1 L2 L3 N AUX 1 phase 2 wire network with 1RogCT IR1 IR2 IR3 L1 L2 L3 N AUX ...

Страница 24: ...th external relays for load command available only on M4M 20 I O Example of wiring for I O5 as alarm output COM is common for all Digital outputs A B I O5 I O6 COM A V aux 48 V a c d c 100mA B External relay Programmable I O Pulse output available only on M4M 20 I O Example of wiring for I O5 as pulse output COM is common for all Digital outputs A C I O5 I O6 COM A V aux 48 V a c d c 100mA C Pulse...

Страница 25: ...o device 6 1 Homepage The device menu is divided into three sections Graphs Data Reading Configuration Menu Description Graphs Graphical representation of the main parameters Data reading Values of the main parameters Configuration Setup of the device ...

Страница 26: ... the number variation Move cursor up or down Move to previous or next page Bluetooth connectivity Notifications Favourite page Home Configuration mode is protected needed to enter password Configuration mode is unprotected password already entered 6 3 Notification icons Symbol Description Alarms user settable related to specific parameters threshold etc Warnings related to installation conditions ...

Страница 27: ...active reactive apparent Min value Minimum values for voltage current and demand power active reactive apparent Max value Maximum values for voltage current and demand power active reactive apparent I O I O status according to the I O type and M4M version Notifications List of notifications divided into alarms warnings errors Timers Count up timer on hours count down timer maintenance timer Menu D...

Страница 28: ...2CT 3Ph 3W 1CT 1 Use to scroll the list on of values or fields 2 Press ENTER to confirm or BACK to cancel the modification Manual data entry 1 Use to scroll the numerical characters available in either ascending or descending order until the required character is obtained 2 Press ENTER to confirm or BACK to cancel the modification Keeping pressed will increase the speed of the number variation 1 1...

Страница 29: ...rtcut key 3 With select the menu item Favourite page 4 Hold on ENTER for 3 seconds 5 When the configuration is completed the green pop up bar Operation succeeded will appear Display Favorite page Realtime energy Power Quality Power Factor Home Favourite Notifications 1 Enter the page you would like to set as favourite 2 Select Shortcut key 3 With select the menu item Favourite page 4 Hold on ENTER...

Страница 30: ...anguages present in the device Unit Language 1 Use to scroll the list on of values or fields 2 Press ENTER to confirm or BACK to cancel the modification 7 2 Password for the first use A password can be set by the user to protect the Configuration menu and avoid any unwanted modification to the device settings 1 At the first use it is mandatory to define a password The password is composed by 5 num...

Страница 31: ...ork In order to configure the type of network it is needed to choose one of the available options according to the installation conditions MID compliant networks are market with M on the display Installation Type of network 3Ph 4W 3CT 3Ph 3W 3CT 3Ph 3W 2CT 3Ph 3W 1CT 1 Use to scroll the list on of values or fields 2 Press ENTER to confirm or BACK to cancel the modification According to the type of...

Страница 32: ...installed current transformers If Rogowski coils are used M4M 20 Rogowski it is not needed to set any transformation ratio In order to configure the current transformers ratio it is possible either to choose the values from a list of values default settings or to manually enter a value Settings choose CT ratio Installation CT ratio Manual 40 5 A 50 5 A 60 5 A CT ratio 1 Use to scroll the list on o...

Страница 33: ...e value of the secondary with 6 Press ENTER to confirm If the CT is replaced varying the value of the transformation ratio before proceeding we recommend 1 Note down the value of the energy counts accumulated with the previous ratio 2 Reset the energy counts 3 Insert a new value of the transformation ratio Enter the password if necessary Please notice that if M4M 20 Rogowski is being used no CT ra...

Страница 34: ...er manually the values of both primary and secondary The default values are 400 for the primary and 400 for the secondary Installation VT ratio 1 Enter the value of the primary with 2 Press ENTER to confirm Max primary VT 500 000 Max secondary VT 999 3 Enter the value of the primary with 4 Press ENTER to confirm Enter the password if necessary In case of direct insertion up to 500V phase neutral w...

Страница 35: ...nd the user cannot reset the lock state M4M 20 M will not count any MID energy until it is locked M4M 20 M MID only Following parameters set during first commissioning phase cannot be modified after the lock operation Primary current transformer Secondary current transformer Primary voltage transformer Secondary voltage transformer Type of network settings ...

Страница 36: ...n without entering any password Installation I O Alarms Unit Configuration Press key in order to return to homepage If the user exits from the Configuration section the device configuration is protected again and it is needed to re enter the password 8 1 Unit Unit Language Reset Device info Modify Password Menu Description Modify Password Change the existing password Language Change the language o...

Страница 37: ...rical character it is necessary to use 2 Confirm the selection of all numerical characters with ENTER 3 When the modification is completed the green popup bar Operation succeeded will appear 4 Set the new password 5 When the entry is completed the green popup bar Operation succeeded will appear If a Factory reset is carried out also the password is reset to default 1 2 ...

Страница 38: ... for the settings and the audit log Avg Min Max reset Reset the average min and max data Energy reset Erase all energy measurement accumulators Up to 240 energy resets can be carried out over the product lifetime M4M 20 M MID Energy reset is disabled for MID version Notification reset Erase all notifications Alarms Warnings Errors Timer reset Reset the count up counter to zero and the count down c...

Страница 39: ... a longer lifetime of the device Energy saving menu In this menu it is possible to define the stand by time and the stand by brightness of the display in order to limit the device power consumption when not in operation conditions Unit Energy saving Energy saving Stand by time Stand by brightness Menu Description Stand by time Set up the time after that the brightness decrease The default value is...

Страница 40: ...ented Energy Where value of total imported active energy imported active energy of L1 L3 as well as total exported active energy from the moment of entry creation are presented Below you can find the detail of data present for each log entry System info Entry num Timestamp Upgrade counter FW Version Configuration TRAFO_V_Prim TRAFO_V_Sec TRAFO_I_Prim TRAFO_I_Sec TRAFO_IN_Prim TRAFO_IN_Sec WIRES En...

Страница 41: ... of voltage transformers for voltage measurement if any Type of network Set the type of network and number of wires on which the device is installed LED Source Set the source for the frontal LED M4M 20 M MID For MID directive it is only possible to configure these parameters before the Lock is completed After the lock operation these configurations cannot be modified in order to avoid antitamperin...

Страница 42: ...tion VT ratio menu During the first commissioning it is mandatory to configure the VT ratio please refer to chapter 7 6 VT ratio Installation VT ratio Installation VT ratio Type of network LED Source CT ratio Type of network menu During the first commissioning it is highly recommended to configure the Type of network please refer to chapter 7 4 Type of network Installation Type of Network Installa...

Страница 43: ...es in proportion to the apparent energy measured 8 3 Inputs Outputs In this section it is possible to configure I O slots of the meter The number and type of I O on the M4M network analyzer varies according to the different product versions Please refer to the table in 3 3 Versions for the detail of I O types per each M4M I O I O Slot 1 Slot 2 Each programmable I O slot con be configured as follow...

Страница 44: ...ergy Total Reactive Export Energy Net Reactive Energy Total Apparent Import Energy Total Apparent Export Energy Net Apparent Energy Pulse ratio Default values 10 100 1000 5000 pulses for each kWh kvarh kVAh or 10 50 100 pulses for each Wh varh VAh Manual between 1 and 999999 pulses for each kWh kvarh kVAh or pulses for each MWh Mvarh MVAh Length Manual value between 10 and 990ms M4M 20 M MID digit...

Страница 45: ...alog outputs that can be used to associate a measured parameter to a current output value It is possible to define the parameter to be associated to the analogue output as well as minimum and maximum measured values to be linked to the output span Menu Description Output span 0 20mA or 4 20mA Parameter Voltage L1 L2 and L3 Voltage L1 L2 L2 L3 L1 L3 Total Current Current L1 L2 L3 Current Neutral Cu...

Страница 46: ... 0 0 00 0 44 0 84 50 100 150 200 250 300 delay threshold turn off threshold turn off turn on 1 21 1 53 1 83 2 08 2 30 2 48 2 63 2 74 2 81 2 85 How the alarm is turned on Whenever measured value crosses threshold for a time that is higher than the defined delay timer is set and starts counting down delay If count down is finished and the value have not crossed back the threshold alarm is turned on ...

Страница 47: ... L2 L3 THD Voltage L1 L2 L3 L1 L2 L2 L3 L1 L3 THD Current L1 L2 L3 neutral Frequency Power Factor total L1 L2 L3 Count down Timer Alarm Type Cross up or Cross down Threshold Manual entry from 0 to 999k Delay Manual entry from 0s to 900s Hysteresis Manual entry from from 0 to 40 Logs Enable or Disable the logging of alarms inside notifications Alarm 1 Alarm 2 Alarm 3 Alarm 4 Alarms 1a In case an al...

Страница 48: ...available on all product version and allow to read data via EPiC Mobile from M4M and carry out basic configuration Communication Bluetooth Enable Disable Start pairing Bluetooth Menu Description Enable Disable Enable disable bluetooth communication Disabled by default Start paring Starts the paring only if Bluetooth communication is enabled When the Bluetooth communication is enabled the communica...

Страница 49: ... for details on Modbus communication protocol and communication map MODBUS TCP IP M4M 20 Ethernet M4M 20 M Ethernet product versions This section is available on all the M4M 20 product versions with Modbus RTU embedded communication Communication Modbus TCP IP Menu Description DHCP Enable Disable disabled by default IP address 192 168 1 12 by default Subnet mask 255 255 255 0 by default Gateway 19...

Страница 50: ...n are excluded from valid values 127 0 0 0 127 0 0 255 224 0 0 0 239 255 255 255 and 255 255 255 255 Subnet mask 128 0 0 0 255 255 255 254 255 255 255 0 It must be valid according to IPv4 subnetting Gateway 0 0 0 0 255 255 255 255 192 168 1 1 This address follows the same restrictions as IP address of device UDP port 0 65535 47808 Device instance 0 4194302 228 This ID must be unique across BACnet ...

Страница 51: ...terval for Average values Timers Configuration of count down timer and timer reset Energy conversion Configuration of conversion factors for energy Average menu In this menu it is possible to configure the time interval used for calculation of average parameters that can be read out in Data reading Average For the data reading of average values please refer to chapter 9 4 Average Other settings Av...

Страница 52: ... to manually enter the value in the format days hours minutes Energy conversion menu In this menu it is possible to configure the conversion factors in order to associate the consumption of active energy to the local currency or to CO2 For the data reading of converted values please refer to chapter 9 2 Energy Other settings Energy conversion Energy conversion Currency kWh CO2 kWh Menu Description...

Страница 53: ...ANALYZER USER MANUAL 53 9 Data Reading Data reading section allows to visualize all the parameters measured by M4M Data Reading Data Reading Energy Power Quality Average Realtime Press BACK to return to the home page ...

Страница 54: ...var L1 0 109 kvar L2 0 085 kvar L3 0 131 kvar Realtime measurement Apparent Power 2 030 kVA L1 0 782 kVA L2 0 313 kVA L3 0 935 kVA Realtime measurement Frequency 50 03 Hz Visualization page Description Summary 3 phase voltage line to line 3 phase current total active power Line Neutral voltage Line to neutral voltage per phase and 3 phase line to line voltage Line Line voltage Line to line voltage...

Страница 55: ...active energy in varh kvarh Mvarh Apparent energy Import Total imported apparent energy in VAh kVAh MVAh Active Energy Export Total exported active energy in Wh kWh MWh Reactive Energy Export Total exported reactive energy in varh kvarh Mvarh Apparent Energy Export Total exported apparent energy in VAh kVAh MVAh Active Energy Net Net value of active energy import export total in Wh kWh MWh Reactiv...

Страница 56: ...Quality 0 981 L1 0 990 L2 0 909 L3 0 969 Power Factor Power Quality 0 976 L1 1 000 L2 0 940 L3 0 986 Cosphi Visualization page Description THD Line Neutral voltage Per phase line to neutral voltage THD values THD Line Line voltage Per phase line to line voltage THD values THD Current Total and per phase current THD values Unbalances Unbalances values for line to neutral voltage VLN line to line vo...

Страница 57: ...rage Line Neutral Voltage Average per phase line to neutral voltage calculated for a defined period of time default 15 minutes Average Line Line Voltage Average per phase line to line voltage calculated for a defined period of time default 15 minutes Average Current L1 L2 L3 Average per phase calculated for a defined period of time default 15 minutes Average Current N Average neutral and ground ca...

Страница 58: ... L2 11 02 VA L3 13 02 VA 36 72 VA Visualization page Descriptions Minimum Line Neutral Voltage Minimum per phase line to neutral voltage measured value Minimum Line Line Voltage Minimum per phase line to line voltage measured value Minimum Current L1 L2 L3 Minimum per phase measured current Minimum Current N Minimum neutral and current Minimum Average Active Power Minimum average value measured in...

Страница 59: ...L2 220 9 kVA L3 220 8 kVA 662 6 kVA Visualization page Descriptions Maximum Line Neutral Voltage Maximum per phase line to neutral voltage measured value Maximum Line Line Voltage Maximum per phase line to line voltage measured value Maximum Current L1 L2 L3 Maximum per phase measured current Maximum Current N Maximum neutral and ground measured current Maximum Average Active Power Maximum average...

Страница 60: ...ow I O slot has been configured Count Number of pulses counted by the I O It is only available if the I O slot has been configured as Pulse input or Pulse output State Status of the I O It is only available if the I O slot has been configured as Pulse Output Output ON Output OFF or Comm output 9 8 Notifications Data Reading Notifications Notifications Alarms Warnings Errors All Menu item Descripti...

Страница 61: ...arnings Errors When one of the notifications is selected the timestamp of the notification will be shown indicating date and time of the alarm warning or error Alarms Data Reading Notifications Alarms Notifications Allarms Alarm 3 Alarm 1 Alarm 4 Alarm 2 If one of the alarms is selected timestamp Day Hour will be shown Day format is YYYY MM DD time format is hh mm ss ...

Страница 62: ...t is hh mm ss Below the list of possible warnings Not Locked device only MID version Negative power L1 L2 L3 Total Frequency out of the metering limit Date not set Time not set V2 V3 connected and it is single phase system V1 missing V2 V3 missing and it is not single phase system I1 missing I2 I3 missing and it is not single phase system I2 I3 connected and it is single phase system L1 L2 L3 conn...

Страница 63: ...nvalid image count error Analog circuit reference error Analog circuit temperature error RTC circuit error 9 9 Power outages Data Reading Power outages At each power fail condition has stored in the persistent storage a power outage log It is possible to have up to 50 entries in cycle way It is not possible to erase the power outages log entries M4M 20 M MID Power outages Power outages notificatio...

Страница 64: ...imers Data Reading Timers Timers Down Counter Up counter 364 23 55 0 00 04 Menu Description Up counter Represents the timer count up of the device lifetime since the power up Down counter Represents the timer count down for the device maintenance ...

Страница 65: ...tically scaled according to the values that are measured in realtime Graphs Graph Line Neutral Voltage L1 L2 L3 120 240 360 V 0 Graph Line Line Voltage L12 L23 L13 120 240 360 V 0 Graph Current L1 L2 L3 4 0 8 0 12 0 A 0 Graph Active Power L1 L2 L3 235 245 255 W 225 Graph Reactive Power L1 L2 L3 60 0 20 0 20 0 var 100 Graph Apparent Power L1 L2 L3 250 254 258 VA 246 Graph Line Neutral Voltage Line ...

Страница 66: ...s product contains no parts that can be repaired or exchanged A broken meter must be replaced If you need assistance please contact ABB Do not open the meter case and do not attempt to repair any component Opening the meter will void accuracy and calibration ...

Страница 67: ... ...

Страница 68: ...ABB S p A Electrification business Viale dell Industria 18 20009 Vittuone MI Italy new abb com low voltage ...

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