Presentation on theme: "SIRIUS Motor Management"— Presentation transcript:
1 SIRIUS Motor Management Caution: The present slide set contains 3D objects. Their correct representation requires the installation of the o2c player! (Refer to directory ..\o2c or visitAs information material for our customers, we particularly recommend the “Conversion flyer” and the product brochure.SIMOCODE proSIRIUS Motor ManagementAs of 09/2004
2 SIMOCODE-DP Has Undergone Advancement Additional and New FeaturesRemovable current transformerAdditional control functionsVoltage detection up to 690 VPower and cos-phiTemperature detection (Pt100/ Pt1000)Analog input/outputMeasuring curves recordingGraphical parameterizationPlus…plus…plusStarting SituationCompatible with SIMOCODE-DP!
3 I/O solutions, communication-capable Motor management systems Starting SituationYesterdaySIMOCODE-DP – the standardStarting Situation€I/O solutions, communication-capableMotor management systemsSIMOCODE-DPSound price/performance Smaller Function scope Larger
4 I/O solutions, communication-capable Motor management systems Starting SituationTodayRequest for reduced price or expanded functionsStarting Situation€I/O solutions, communication-capableMotor management systemsReduced price: E.g. for customers who want to replace their conventional switchgear by communication-capable switchgear but are, however, not willing to pay the costs for such replacement.Expanded functions: E.g. power management (voltage, power, cos-phi....)Expanded functionsReduced priceSIMOCODE-DPNew requirements Smaller Function scope Larger
5 SIMOCODE pro V variable Starting SituationTomorrowDivision into two systems for consistent and cost-favorable customized functionalityStarting Situation€SIMOCODE pro V variableSIMOCODE-DPSIMOCODE pro C compactExpanded customized functions Smaller Function scope Larger
7 The System Up to 80 % of all present SIMOCODE-DP applications SIMOCODE pro C – CompactThe compact system for:Direct starters andReversing startersSystemUp to 80 % of all presentSIMOCODE-DP applicationsat a price reduction of 20 %.
8 The Design of SIMOCODE pro Motor Feeders SIMOCODE pro C – CompactMain circuitControl circuitAutomation systemSystemBasic Unit 1Current Measuring ModuleConnectionCableOperatorPanel**) OptionalDesign of SIMOCODE pro CEvery system is always equipped with a basic unit as basic component and a separate current monitoring module per each feeder. Both modules are electrically interconnected by means of a connection cable and, as with SIMOCODE-DP, can optionally be mechanically connected as a unit (back-to-back) or can be mounted separately (side-by-side). Thanks to the separation of the basic unit and the current detection, the main circuit may now have a distance of up to 2 m to the respective control circuit. Due to the separate current detection, the motor current to be monitored only influences the selection of the respective current monitoring module. Optionally, an operator panel for cabinet door mounting can be connected to the basic unit. The current monitoring module and the operator panel are electrically fed by the basic unit. No additional wiring is required.
9 The System SIMOCODE pro V – Variable All control functions and The variable system with:All control functions andVariably expandable additional functionsSystemNote: SIMOCODE pro V is downward-compatible with SIMOCODE pro C and, in addition to all SIMOCODE pro C functions, offers many additional functions. The parameterization of SIMOCODE pro C can be adopted unchanged.
10 The Design of SIMOCODE pro Motor Feeders SIMOCODE pro V – VariableMain circuitControl circuitAutomation systemSystem+ Expansionmodules*Basic Unit 2Current/VoltageMeasuring Module**) OptionalConnectionCableOperatorPanel*Design of SIMOCODE pro VThe design corresponds to SIMOCODE pro C.However: Compared with basic unit 1 (SIMOCODE pro C), the basic unit 2 (SIMOCODE pro V) can be extended by additional inputs/outputs and functions with the help of various optional expansion modules. Consequently, special functions such as, e.g. earth fault detection with a summation current transformer, can be applied only where they are required.
11 The Systemhas been designed for mixed operation.Targeted combination of SIMOCODE pro C and SIMOCODE pro V in the same switchgear, depending on the individual functional requirementsSIMOCODE pro C is fully upward-compatible with SIMOCODE pro VSystemI.e. with a conversion to SIMOCODE pro V:No re-wiring is required (removable terminals)The current measuring module can remain in the main circuitNo additional engineering is required (identical terminals)The pro C parameterization can be adopted unchangedpro V utilizes the same components as pro C (stock-keeping)A mixed application in the same switchgear does not produce extra costs – it saves costs!
12 Current Measuring Module The SystemBasic UnitOperator PanelSIMOCODE pro CCurrent Measuring ModuleExpansion modulesDigital ModulesAnalog ModuleTemperatureModuleEarth FaultSIMOCODE pro V+ Voltage detectionSIMOCODE-DPSystem
14 The Components SIMOCODE pro C – Compact Current Measuring Module 0.3 A – 630 AStraight-through/busbar connection technology4 I / 3 O binaryThermistorPROFIBUS-DP24 V DC /110 – 240 V UCBasic Unit 1ComponentsConnection CableIn various lengths(up to 2 m)Operator Panel5 buttons / 10 LEDsBasic Unit 1 (BU 1) as basic componentThe basic unit forms the basic component of the SIMOCODE pro C system.The approximate bisection of the width compared to the previous device to a width of merely 45 mm is an essential novelty.The new wide-voltage range (110 – 240 V AC/DC) for the supply voltage grants enhanced application flexibility. As a matter of course, a 24 V DC version is also available.Practical - the thermistor connection integrated in the basic units. Additional evaluation units can therefore be dispensed with. The features known from SIMOCODE-DP such as 4 binary inputs (24 V DC internal supplied), the 3 monostable relay outputs as well as the PROFIBUS-DP connections are also embedded in both basic units (SUB-D and terminal connection).Note: Now one relay output less at the basic device.The operator panel (OP) facilitates motor feeder control via the control cabinetHalved height – identical width ... and yet expanded functionality! With a surface of only 36 x 96 mm (H x W), the new operator panel can replace 5 conventional pushbuttons and 10 LEDs. With the now freely assignable 4 pushbuttons and 7 LEDs, the new operator panel now offers an even expanded functionality while offering space savings of up to 50 % in comparison with the previous devices.Note: One additional pushbutton and additional LEDs – and still reduced space requirements.
15 The Components SIMOCODE pro V – Variable Current Measuring Module Basic Unit 24 I / 3 O binaryThermistorPROFIBUS-DP24 V DC /110 – 240 V UC0.3 A – 630 AStraight-through/busbar connection technologyComponentsExpansion modulesAdditional binary I/Os1 x 0/4 – 20 mA I/O3 x sensors Pt100/ Pt1000External earth fault via summation current transformerConnection CableIn various lengths (up to 2 m)Operator Panel5 buttons / 10 LEDsCurrent/Voltage Measuring Module0.3 A – 630 A /690 VStraight-through/busbar connection technologyCurrent monitoring module and operator panel as with SIMOCODE pro C.Basic Unit 2 (BU 2) as basic componentAll terminals as with BU 1.However: The BU 2 offers more functions and the option of connecting the described expansion modules.Furthermore, also a current/voltage measuring module can be applied instead of the current measuring module (voltage/power measuring, etc.) with these units.Note: The BU 2 has a larger mounting depth than the BU 1.
16 Straight-through transformer The Current RangesCurrent Measuring Modules for all motor currentsWidths:45 mm55 mm120 mm145 mmComponentsCurrent Measuring Modules (IM)The current detection which is now separated from the basic units facilitates a far more flexible integration in the motor feeder. Thanks to connection cables with a length of up to 2 m, the main circuit can now have a “somewhat longer” distance to the control circuit. This makes SIMOCODE pro applicable also in very confined environments. The extended and noticeably overlapping current ranges as of 0.3 A are a particular novelty.The mechanical connection of the basic unit and the current measuring module as one unit as with SIMOCODE-DP is also possible for current measuring modules up to 100 A.New: The 20 – 200 A current measuring module is now available either with straight-through transformer or with busbar connection technology.0.3 – 3 A2.4 – 25 A10 – 100 A20 – 200 A63 – 630 A *)Straight-through transformer0.3 Aor higherBusbar connection*) With 3UF18 intermediate transformers up to 820 A
17 Straight-through transformer The Voltage RangeCurrent/Voltage Measuring ModulesWidths:45 mm55 mm120 mm145 mmComponentsCurrent/Voltage Measuring Modules (UM)Similar to the current measuring modules, however, with the option of detecting the string voltages within the main circuit by the additional wiring of 3 conductors.The application of a current/voltage measuring module facilitates the measuring, processing and monitoring of power-related parameters. (Apparent power, effective power, power factor, phase sequence ….)Note: A mechanical connection of the BU with a UM is not possible. Side-by-side mounting.0.3 – 3 A2.4 – 25 A/ 690 V10 – 100 A/ 690 V20 – 200 A/ 690 V63 – 630 A*)/ 690 VStraight-through transformerUp to 690 VBusbar connection*) With 3UF18 intermediate transformers up to 820 A
18 Variably Expandable Additional Functions Expansion modules for SIMOCODE pro VUp to 5 expansion modules can be connected to theBasic Unit 2:Digital Modules for: Max.2Additional binary I/OsBistable relay outputsExternally supplied inputs(24 V DC or 110 – 240 V AC/DC)ComponentsExpansion by additional binary I/Os or bistable relay outputsAs with SIMOCODE-DP, the basic unit can be expanded by additional binary inputs or relay outputs which can later be assigned to any functions within the system in accordance with the user‘s individual requirements. Other than with SIMOCODE-DP, this can now be realized in two steps by means of up to two digital modules with a width of 22.5 mm. In other words:With SIMOCODE pro, the adequate replacement of an expansion module known from SIMOCODE-DP requires only 50 % of the space! In addition, the versions listed below can be flexibly combined and are applicable at the same basic unit:Digital module: 4 inputs, external supply with 24 V DC and 2 monostable relay outputsDigital module: 4 inputs, external supply with 110 – 240 V AC/DC and 2 monostable relay outputsDigital module: 4 inputs, external supply with 24 V DC and 2 bistable relay outputsDigital module: 4 inputs, external supply with 110 –240 V AC/DC and 2 bistable relay outputsExpansion by earth fault monitoring with summation current transformerA decision between an earth fault detection or thermistor motor protection is no longer required! This is the solution: Both functions can be integrated in the same feeder within only one system if required by the user! The basic unit 2 (SIMOCODE pro V) can additionally be expanded by a earth fault module (22.5 mm). By means of a summation current transformer, an even more accurate external earth fault monitoring can thus be realized. The advantage – a summation current transformer used with SIMOCODE-DP can remain in the main current circuit and be further used with SIMOCODE pro. The tripping behavior thus remains unchanged.Earth Fault Module for: Max.1Expansion of the internal earth fault monitoring by a sophisticated external monitoring withsummation current transformer
19 Variably Expandable Additional Functions Expansion modules for SIMOCODE pro VUp to 5 expansion modules can be connected to theBasic Unit 2:Temperature Module for: Max.1Temperature monitoring of up to 3 analog temperature sensors (e.g.: Pt100/ Pt1000)New!ComponentsExpansion by analog temperature detection and monitoringBeside temperature monitoring using binary PTC resistors, motors are often also monitored via analog temperature sensors. Irrespective of the thermistor motor protection, the new temperature module (22.5 mm) facilitates the connection of up to three analog temperature sensors (e.g.: Pt100/ Pt1000) to the SIMOCODE pro V system. SIMOCODE pro V detects and monitors the current motor temperature and forwards it to the automation system.Note: Sensor measuring circuits in three-conductor technology. Within the system, only one temperature (the max. temperature) of all measuring circuits is available.Expansion by an analog input and output (0/4 – 20mA)Are filling levels, flowrates or positions also to be detected and monitored? If so, SIMOCODE pro offers the suitable expansion module.The optional analog module (22.5 mm) facilitates the detection, monitoring and output of a 0/4 – 20 mA signal and offers free access to the automation system via PROFIBUS-DP.Note:The analog output can be assigned with any “analog value” available within the system (e.g. current motor temperature, phase current, voltage, actual timer value, actual counter value, etc.).The conversion of a 4…20 mA signal into a 0…20 mA signal is also possible (…and, of course, the other way around).Analog Module for: Max.1Input/output and monitoring of analog signals (0/4 – 20 mA) for, e.g., filling level/flowrate monitoring or the actuation of a display unitNew!
20 Smaller Dimensions Including expanded functionality SIMOCODE pro 67.5 mm90 mm140 mm12 binary inputs7 relay outputsThermistorPROFIBUS DP8 relay outputsImproved scaling accuracyAll digital modules are combinableAdditional functions45 mm70 mm4 binary inputs3 relay outputsThermistorPROFIBUS DP4 relay outputsComponents96 mm36 mmSIMOCODE-DP60 mm96 mm
22 Comprehensive motor feeder protection The FunctionsBased on SIMOCODE-DP.SIMOCODE pro is a flexible and modular motor management system for motors used in low-voltage applications.SIMOCODE pro integrates the following features in only one system:Multifunctional electronic motor protectionFlexible software for motor controlDetailed operating, service and diagnostics dataCommunication via PROFIBUS-DPFunctionsAll functions known from SIMOCODE-DP have been revised and improved in terms of flexibility. Many new functions have been integrated.Comprehensive motor feeder protection+ flexible control!
23 The Functions More functions than ever before. Protective functionsOverload protection (Class )Thermistor motor protectionControl functionsDirect online starterReversing starterStar-delta starterStar-delta starter with reversal of rotational directionTwo speeds, motors with separate windings (pole changeover switch), also with reversal of rotational directionTwo speeds, motors with separate Dahlander windings, also with reversal of rotational directionSolenoid valve actuationPositioner actuationSoft starter actuationSoft starter actuation with reversal of rotational directionPhase failure monitoringUnbalance protectionStall protectionEarth-fault monitoringMonitoring of current limit valuesMonitoring of operating hoursMonitoring of motor stop timesNumber-of-starts monitoringEtc.Expanded monitoring functions:Temperature monitoring Pt100/ Pt1000Voltage monitoringPower monitoringCos-phi monitoringPhase sequence detectionInput, output and monitoring /4-20 mA signalMeasuring curves recordingFunctionsProtective and monitoring functionsAlmost all protective and monitoring functions are now designed as multi-step solutions (advance warning and fault) and offer a delay option.Control functionsThe control functions known from SIMOCODE-DP+ new control functions (refer to the next page).Logic modules (truth tables, counters, timers, edge evaluation, limit monitoring...) andStandard functions (power failure monitoring, emergency start, external faults ...)
24 The Functions What‘s New. Protective functions Overload protection (Class )Thermistor motor protectionControl functionsDirect online starterReversing starterStar-delta starterStar-delta starter with reversal of rotational directionTwo speeds, motors with separate windings (pole changeover switch), also with reversal of rotational directionTwo speeds, motors with separate Dahlander windings, also with reversal of rotational directionSolenoid valve actuationPositioner actuationSoft starter actuationSoft starter actuation with reversal of rotational directionPhase failure monitoringUnbalance protectionStall protectionEarth-fault monitoringMonitoring of current limit valuesMonitoring of operating hoursMonitoring of motor stop timesNumbers-of-starts monitoringEtc.Expanded monitoring functions:Temperature monitoring Pt100/ Pt1000Voltage monitoringPower monitoringCos-phi monitoringPhase sequence detectionInput, output and monitoring 0/4-20 mA signalMeasuring curves recordingFunctionsLogic modules (truth tables, counters, timers, edge evaluation, limit monitoring...) andStandard functions (power failure monitoring, emergency start, external faults ...)
25 The Data Even more detailed information on the motor feeder. The data Operating dataMotor switching state(on, off, left, right, slow, fast)Current in phase 1, 2, 3 and max. currentVoltage in phase 1, 2, 3Effective powerApparent powerPower factorPhase unbalancePhase sequenceTime to tripMotor model heatingRemaining motor cooling timeTemperature (e.g. motor temperature)Current analog signal valueEtc.Service data Motor operating hoursMotor stop timesNumber of motor startsNumber of overload tripsUnit-internal storage of commentsUnit operating hoursEtc.FunctionsDiagnostics data Numerous detailed early warning and fault messages, also for further processing within the device or the control systemDevice-internal fault logging with time stampTime stamp marking of individually selectable status, warning and fault messagesValue of the last tripping currentCheckback faults (e.g. no current flow in the main current circuit after ON control command)Etc.Communication12 Mbps , automatic baud rate detectionTime synchronizationCyclic and acyclic servicesThe dataWith these data, you receive an even more comprehensive picture of your motor feeder and are always up-to-date. The additionally integrated maintenance-relevant functions support the maintenance and service personnel.
26 The Data What‘s New. Operating data Motor switching state (on, off, left, right, slow, fast)Current in phase 1, 2, 3 and max. currentVoltage in phase 1, 2, 3Effective powerApparent powerPower factorPhase unbalancePhase sequenceTime to tripMotor model heatingRemaining motor cooling timeTemperature (e.g. motor temperature)Current analog signal valueEtc.Service data Motor operating hoursMotor stop timesNumber of motor startsNumber of overload tripsUnit-internal storage of commentsUnit operating hoursEtc.FunctionsDiagnostics data Numerous detailed early warning and fault messages, also for further processing within the device or the control systemDevice-internal fault logging with time stampTime stamp marking of individually selectable status, warning and fault messagesValue of the last tripping currentCheckback faults (e.g. no current flow in the main current circuit after ON control command)Etc.Communication12 Mbps , automatic baud rate detectionTime synchronizationCyclic and acyclic services
28 Integration & Configuration In any automation system.As with SIMOCODE-DP and with compatibility modeTotally IntegratedOthersystemsSIMATIC S7PCS7Compatibility: SIMOCODE-DP – SIMOCODE proSimultaneous operation at the bus/ unit replacementMust the otherwise necessary adaptations in the control system be restricted to a minimum or even avoided within the scope of a system expansion or unit replacement ? – SIMOCODE pro offers the solution!Integration into the automation systemA system expansion or unit replacement by an advanced generation of communication-capable motor management and control devices must, especially in highly available processes, not automatically lead to extensive configuration tasks within the automation system or even to system downtimes. This is why a “3UF50 compatibility mode” has been integrated in the basic unit 2 (SIMOCODE pro V). If SIMOCODE pro V is switched to this compatibility mode, data exchange is realized via PROFIBUS without affecting the automation system as with a respective SIMOCODE-DP. I.e. the automation system is continuously supplied with the required data without any additional expenditures although, within the field, SIMOCODE pro V is applied.ParameterizationThe installation of a new GSD file, a new object manager for STEP7 or an EDD for SIMATIC PDM for device parameterization via PROFIBUS is not categorically required. SIMOCODE ES Professional offers the possibility of also realizing the parameterization via PROFIBUS-DP. The frequently available parameter files of SIMOCODE-DP can be converted into SIMOCODE ES parameter files and used for the parameterization of the new devices. (Converter) Advantage: Thanks to the device function adopted by SIMOCODE-DP and an identical parameterization, the protection, monitoring and tripping behavior of the motor practically remains unchanged. I.e. also within the field, SIMOCODE pro behaves as SIMOCODE-DP.Result: SIMOCODE pro V behaves as SIMOCODE-DP at the bus and additionally assures an identical motor tripping behavior.IntegrationPROFIBUS-DPConfiguration software:SIMOCODE ESoptionally with“SIMOCODE ES Graphic” graphic editor3UF50 compatibility modeat the PROFIBUS-DPConverter:Conversion of “old” parameter files into SIMOCODE ES parameter filesSIMOCODE-DPSIMOCODE pro
29 Integration & Configuration Easy and fast with SIMOCODE ES.SystemControl cabinetGraphical parameterizationSIMOCODE pro can be integrated into any conventional PROFIBUS-DP capable automation system.Parameterization and diagnostics with SIMOCODE ESSIMOCODE ES is the new parameterization software for SIMOCODE pro, executable on a PC/PG under Windows 2000 or Windows XP. With SIMOCODE ES, the SIMOCODE pro motor management system offers a user-friendly and clearly structured interface with which the SIMOCODE pro can be comfortably parameterized, operated, monitored and tested both within the field or via a central station. Thanks to the display of numerous operating, service and diagnostics data, SIMOCODE ES supplies the user with significant information for maintenance or failure cases. In failure cases, faults can thus rapidly be localized and rectified. The two versions:SIMOCODE ES Smart, for direct connection to SIMOCODE pro via the unit‘s system interface (point-to-point) by means of the new PC cable.SIMOCODE ES Professional, for connection to one or several devices via PROFIBUS-DP or point-to-point via the system interface.Note: SIMOCODE-DP cannot be parameterized with SIMOCODE ES. / Old PC cables cannot be used.PROFIBUS-DPIntegrationSIMOCODE proMeasuring curve evaluationOperating and diagnostics dataMachine / system
30 Integration & Configuration Clearer structure with SIMOCODE ES Graphic.SIMOCODE ES GraphicThe optional software package for SIMOCODE ES facilitates a very ergonomic and user-friendly parameterization via “Drag & Drop.” The inputs and outputs of the function blocks can be graphically linked and parameters can be set.Thanks to individual comments, the configured functions can be described in detail and the device parameterization can be graphically documented. – This speeds up commissioning and “visibly” simplifies documentation.IntegrationFor a more detailed description of the configured functions, comments can be embedded.Representation of a preliminary version!
31 Integration & Configuration In any system configuration.SystemOperator stationEngineering stationMaintenance stationPower ManagementBesides balanced unit functions and an elaborate hardware layout, also the user friendliness of the parameterization software as well as a profound system integration play important roles. A motor management system such as SIMOCODE pro must offer optimum and rapid integration options into the most various system configurations and automation systems. Thanks to our consideration of this aspect, we can now, with SIMOCODE pro, offer you the appropriate software tools for consistent and time-saving configuration, commissioning and diagnostics.PROFIBUS-DPIntegrationSIMOCODE ESSIMATIC PCS 7Control cabinetMachine / system
32 Integration & Configuration In any system configuration.SystemEngineering stationOperator stationMaintenance stationPower ManagementPROFIBUS-DPIntegrationSIMOCODE ES GraphicSIMATIC PDMControl cabinetMachine / system
33 Integration & Configuration In any system configuration.SystemMaintenance /Power ManagementOperator stationEngineering stationThanks to the multitude of various operating and service data which SIMOCODE pro is able to supply, SIMOCODE pro is not only a motor management system which integrates the load feeder into an automated process. – In parallel, it can furthermore feed power management or maintenance systems with the data required by such systems. Due to this, SIMOCODE pro also functions as an “intelligent sensor” within the field for these kinds of superior systems.PROFIBUS-DPIntegrationSIMARIS ManagerSIMOCODE ESControl cabinetMachine / system
34 Integration & Configuration Small auxiliary equipment with large time-saving potentials.Addressing Plug for assignment of PROFIBUS address without PC/ PGAssignment of a PROFIBUS address to one or several basic units within seconds.Memory Module for parameterization without PC/PGDo you want to rapidly commission a new SIMOCODE pro?Especially in the motor control centers of the process industry, the availability of the motors and with it, the availability of the processes is of utmost importance. Even short downtimes often result in high costs. With the new storage module, you can rapidly commission SIMOCODE pro without any further auxiliary tools.Note: The storage module transmits the parameters and the PROFIBUS address. / The storage module can be “fed” by means of a basic unit, e.g. also in the office. / It is absolutely optional. Also without plugged-on storage module and after loss of the power supply at the basic unit, SIMOCODE pro does not lose its parameterization.Addressing Plug for PROFIBUS addressFrequently, PROFIBUS slaves are comfortably parameterized from a central station via PROFIBUS. For such remote parameterization, a PROFIBUS address is required. With the new addressing plug, any basic unit can be assigned with any PROFIBUS address within seconds, thereby ensuring the units‘ addressability by PROFIBUS-DP. With SIMOCODE ES Professional, several SIMOCODE pro units can thus, for example, easily be commissioned via a central station.IntegrationCommissioning of a motor feeder within seconds.Memory Module for parameterization without PC/ PG
36 35 x The Practice Low-voltage switchgear with SIMOCODE pro Requirements:Space-savingFlexibleReliableCommunication-capableLoad feeder up to 25 APractice35 xWith SIMOCODE pro, now plug inserts with a height of 50 mm are possible.Before, only plug inserts with a height of 100 mm were applicable with SIMOCODE pro.With the illustrated control cabinet, 35 motors can now be protected and controlled.Including communication with the automation system and the function multitude and flexibility known from SIMOCODE.
37 Installation of the Current Monitoring Module beside the Basic Unit. The PracticeWithdrawable-unit with SIMOCODE proPracticeAbsolute mounting flexibility: Current measuring modules side-by-side with the basic unit or ...Installation of the Current Monitoring Module beside the Basic Unit.
38 The Practice In-line plug-in module with SIMOCODE pro Plug-in unit up to 25 A with a height of 50 mm. (Current Monitoring Module behind the Basic Unit)... current measuring modules back-to-back with the basic unit.