Absolute encoder

After switching on the supply voltage, this position encoder immediately provides the position of the drive as an absolute actual value. For single-turn encoders, the detection range is one turn, whereas multiturn encoders have a detection range of several turns (a typical number is, for example, 4096 turns). If an absolute encoder is used as a position encoder, no search for reference is required after the switch-on and the reference switch (e.g. BERO) which could normally be required is not necessary in this case.

There are rotary and linear absolute encoders.

Example of an absolute encoder:

1FK and 1FT motors can be delivered with integrated multiturn absolute encoders with 2048 sinusoidal/cosinusoidal signals per turn, over 4096 turns absolute and в†’ "EnDat protocol".

Active Infeed

Overall functionality of an infeed with в†’ Active Line Module, including the required additional components (filters, switching devices, computing power portion of a в†’ Control Unit, voltage detection, etc.).

Active Interface Module

This module includes the line-side components required for an в†’ Active Line Module like, for example, the pre-charging input circuit (pre-charging contactors and bypass connector).

Active Line Module

A controlled, self-commutating feed/feedback unit (with IGBTs in feed/feedback direction) which supplies a constant DC link voltage for the в†’ Motor Modules. The Active Line Module operates together with the в†’ Line reactor as a step-up converter.

Asynchronous (induction) motor

The asynchronous motor is an AC motor whose speed runs "behind" the synchronous speed.

Asynchronous motors can be connected to the three-phase system either directly in a star or delta connection or via a converter.

In combination with a converter, the asynchronous motor becomes a variable-speed drive system.

Other commonly used terms: squirrel-cage motor, cage motor.

See also в†’ Synchronous motor.

Automatic restart

Upon power recovery after a mains failure, the Automatic restart function switches a converter automatically ON without requiring an acknowledgement of the power failure error. The automatic restart function e.g. minimizes drive standstill times and production failures.

However, operators must be aware of the danger situation which can occur when a drive recovers automatically after a longer power failure period without any operator action. If required, safe behaviour in such a danger situation must be insured by external control actions (e.g. withdrawal of the ON command).

Typical applications of the automatic restart: pump/fan/compressor drives working as single drives and often do not provide local control options. The automatic restart function is not used for coordinated drives for continuous material webs and motion control.

The following variants of this function can be set by means of parameters for SINAMICS:

• restart after a power failure if the 24‑V electronic supply does not yet exist
• restart after a failure of the 24 V electronic supply
• restart after any shut down on fault

The following actions can be specified via parameters:

• only acknowledgement of the mains failure message (e.g. for multi-motor drives, DC compound)
• ON command upon expiry of the parameterized delay time
• ON command with flying restart

The number of possible restart trials within a parameterizable time can be specified.

It is also possible to activate the в†’ Flying restart function in addition to the automatic restart function to ensure a bumpless switching to a possibily still rotating motor.

Basic Line Filter

In combination with a line reactor, line filters limit the conducted electromagnetic interference emission in accordance with EMC legislation.

Basic Line Module

Unregulated infeed unit (diode bridge or thyristor bridge, without power feedback) for rectifying the line voltage of the в†’ DC link.

Basic Operator Panel

Simple small operator panel for plugging on a SINAMICS в†’ Control Unit with numeric display and some keys.

BOP20 is part of the SINAMICS product range.

Blocksize

Volume-optimized, cubic construction of a drive unit. Mostly used for operating a motor.

See в†’ Booksize, в†’ Chassis unit.

Booksize

Book-shaped construction of the components of a drive group appropriate for back-mounting. Designed primarily for operating several в†’ Motors.

Brake control

Software function specifying the instant when an existing mechanical holding brake or operational brake has to be applied; either within the framework of a load cycle in the case of a momentary standstill, or in the case of a fault.

Brake Relay

Component with a 24 V relay for brake control. Brakes can be switched using this relay with a rating of 24 V DC/12 A or 440 V AC/12 A.

Braking Module

Electronic switch or chopper (brake chopper), which connects a в†’ Braking resistor with a specific pulse/pause ratio to the DC link voltage to convert regenerative (braking) energy to heat energy and to finally restrict the DC link voltage to permissible values. For SINAMICS, no braking resistor is incorporated in the braking module. It must be mounted outside the braking module.

Braking power

Regenerative power injected into the в†’ DC link by one or several в†’ Motor Modules, e.g. when lowering a load or decelerating a motor.

See в†’ Braking resistor.

Braking resistor

Resistor which reduces the excess energy in the в†’ DC link. The resistor is connected to a в†’ Braking Module.

In this way, the resulting thermal loss is displaced outside the cabinet.

See в†’ Braking power.

Capacitor Module

The module is used for increasing and buffering the DC link capacity.

It can be used for compensating a short-time power failure or for intermediate storage of the braking energy.

Chassis unit

In the upper output power range, chassis units are mostly used for incorporation in control panels. The components are mounted on supporting panels or frames.

See в†’ Booksize в†’ Blocksize.

Cold plate

The cold plate is a flat aluminum plate that is used as a thermal interface by the SINAMICS power modules with the в†’ Cooling method в†’ Cold plate cooling.

Cold plate cooling

Cold plate cooling is a в†’ Cooling method for SINAMICS power modules that is only available currently for the в†’ Booksize units. The cold plate is fixed to the rear of the unit instead of the normal ribbed heat sink.

Command data set

Parameter data set consisting of the binector inputs (e.g. for control commands) and the connector inputs (e.g. for setpoints).

The individual data sets are represented as indexed parameters. The changeover is performed via input signals.

The appropriate parameterization of several command data sets and the changeover of the data sets allows the optional operation of the drive with different preconfigured signal sources.

Communication Board

A module for external communication, e.g. в†’ PROFIBUS, в†’ PROFINET, CAN or Ethernet. It is plugged into the option slot of a в†’ Control Unit.

Communication Board Ethernet 20

A module for operation with в†’ PROFINET (the open Industrial Ethernet standard of PROFIBUS International for automation systems).

PROFINET IO with IRT (Isochronous Real Time) and PROFINET IO with RT (Real Time) are supported. It is plugged into the option slot of a в†’ Control Unit.

CompactFlash card

Memory card for non-volatile storing of the drive software and of the corresponding parameters. The memory card can be plugged into the в†’ Control Unit from outside.

Control Supply Module

24 V power supply module for the electronic circuitry of components in a SINAMICS drive group.

The Control Supply Module is supplied via two inputs: The incoming supply and the в†’ DC link. The DC link connection ensures that the electronics power supply is buffered in the event of a power failure or voltage dip, thereby enabling emergency retraction and kinetic buffering.

Control Unit

Central control module: the feedforward and feedback control functions for several SINAMICS в†’ Line Modules and/or в†’ Motor Modules are implemented in this module.

Control Unit Adapter

A module for в†’ DRIVE-CLiQ communication between a в†’ Power Module in blocksize format (PM340) and a в†’ Control Unit for several drives (e.g. CU320).

The Control Unit Adapter is connected through the в†’ Power Module interface (PM-IF) to the в†’ Power Module and through в†’ DRIVE-CLiQ to the в†’ Control Unit.

DC link

The component of the converter (or converter system) that connects the input current converter (rectifier) and the output current converter (one or more converters).

With voltage source DC link converters like SINAMICS, a constant DC voltage is present in the DC link (rectified line voltage).

Direct measuring system

Position encoder which is connected directly to the moving machine part as well as to the associated evaluation electronics. In the case of linear axes, it is also possible to use linear scales for this purpose.

In many cases, a direct measuring system must be used because the в†’ Motor encoder for position sensing and control does not suit this purpose, e.g. due to excessive elasticity and backlash in the drive train.

Double Motor Module

Two motors can be connected to and operated with a Double Motor Module.

See в†’ Motor Module, в†’ Single Motor Module.

DRIVE-CLiQ

Abbreviation of Drive Component Link with IQ.

Communication system for connecting the various components of a SINAMICS drive system, such as the в†’ Control Unit, the в†’ Line Modules, the в†’ Motor Modules, the в†’ Motors and speed/position encoders.

The DRIVE-CLiQ hardware is based on the Industrial Ethernet standard and uses twisted-pair lines. The DRIVE-CLiQ line provides the transmitted and received signals and also the +24 V power supply.

Drive system

A drive system includes all components of a family of products (e.g. SINAMICS) belonging to a drive. A drive system includes components such as в†’ Line Modules, в†’ Motor Modules, в†’ Encoders, в†’ Motors, в†’ Terminal Modules and в†’ Sensor Modules, as well as complementary components such as reactors, filters, lines, etc.

Droop

Droop involves making the speed controller artificially "soft" by entering an adjustable percentage of the speed controller output signal with negative sign at the speed controller input. This means that the speed is slightly reduced at higher load torques. The droop function is used to reduce the response to load surges and for certain variations of load sharing control for drives which are coupled with one another through a continuous material web. The I component or the summed output signal can be used as speed output signal. The droop can be switched on and switched off using a control command.

Dynamic Servo Control

Dynamic Servo Control (DSC) allows the position actual value to be evaluated in a fast speed control clock cycle directly in the drive. The position reference value (position setpoint) is entered in the position controller clock cycle from the higher-level control via the isochronous в†’ PROFIBUS with в†’ PROFIdrive telegrams.

With sophisticated signal filtering and pre-control, DSC ensures optimum dynamics in the position control loop with a low bus bandwidth load.

DSC allows high control gains to be achieved and therefore a high level of stiffness - for instance to quickly compensate and correct load-related track/path deviations.

Edge modulation

Type of modulation for a drive converter gating unit, where the pulses "chopped" from the DC link voltage do not appear in a fixed time grid. The edges of the output voltage which is generated are formed by several short pulses near the zero crossing, while a wide pulse is generated at the center of every half-wave. This allows a high output voltage roughly approximating to 100% of the line connection voltage and therefore ensuring good motor utilization.

Electronic rating plate

Each component of the SINAMICS drive system, which is connected via в†’ DRIVE-CLiQ has an electronic rating plate.

This plate can be read out via the в†’ STARTER commissioning tool and provides the following information: type, order number, version, manufacturer, serial number and rated technical data.

Encoder

An encoder is a measuring system capturing actual values for the speed and/or angular/position values and provides them for electronic processing. Depending on the mechanical construction, encoders can be incorporated in the в†’ Motors (в†’ Motor encoder) or mounted on the external mechanics. Depending on the individual type of movement, we distinguish between rotary encoders and translatory encoders (e.g. linear encoder). In terms of measured-value provision, we distinguish between в†’ Absolute encoders (code sensors) and в†’ Incremental encoders.

See в†’ Incremental encoder TTL/HTL, в†’ Incremental encoder sin/cos 1 V_pp, в†’ Resolver.

EnDat protocol

Serial transmission protocol for transmitting position/angular actual values from an в†’ Absolute encoder to the drive or positioning control.

The EnDat protocol also allows parameterization and diagnostics of the encoder.

Fault buffer

Once a fault has occurred, the drive enters it in a fault buffer. The fault buffer can be read out via parameters.

Field weakening

The term field weakening designates the reduction of the magnetizing current of an electric motor to further increase the speed upon reaching the rated current.

Flexible response

With this function, the converter can be operated even in case of a voltage dip up to a minimum DC link voltage of approx. 50% of the rated value (or of the parameterized line connection voltage value). In case of a voltage dip, the maximum output power of the converter decreases analogous to the current line voltage.

In contrast to kinetic buffering, a significant speed decrease can be avoided as long as the remaining power is sufficient for operating the drive with the required torque.

Flying measurement

When a hardware signal is received, the instantaneous position actual value is saved and, for example, is made available via PROFIBUS. The hardware signal can, for instance, be received from a measuring probe or a print index sensor (mechanical switch, BERO proximity switch or optical sensor). The active edge of the hardware signal can be parameterized (rising, falling or both).

Flying restart

After Power on, the "flying restart" function automatically switches a converter to a possibly coasting motor. When switching to the rotating motor, the motor first needs to be magnetized by an в†’ Asynchronous motor. For drives not equipped with an encoder, a search for the current speed is carried out. The current speed setpoint in the ramp-function generator is then set to the current actual speed value. Ramp-up to the definitive speed setpoint starts out at this value. The flying restart function can help to shorten the ramp-up procedure following power-up when the load is still coasting down.

Application example:

After a power failure, a fan drive can be quickly reconnected to the running fan impeller by means of the flying restart function.

See в†’ Automatic restart.

Heat dissipation

The thermal losses are conducted away from the converter and/or motor so that the permissible temperatures are not exceeded.

Hub

Central connecting element in a network based on star connection technology. A hub distributes arriving data packages to all devices connected.

Incremental encoder

Incremental position and speed encoder. In contrast to the в†’ Absolute encoder, this encoder does not output an actual position value signal corresponding to the absolute path, but outputs incremental "delta position or angular signals" instead.

The following three types of incremental encoders are available в†’ Incremental encoder TTL/HTL, в†’ Incremental encoder sin/cos 1 V_pp or в†’ Resolver.

Incremental encoder sin/cos 1 V_pp

An incremental encoder sin/cos 1 V_pp is defined as a high-resolution optical sine/cosine encoder which can, for example, be incorporated in 1FK motors as a в†’ Motor encoder.

As a rule, the following signals are output:

• Two signals displaced by 90 degrees, with respectively 2048 sinusoidal signal periods per revolution as differential signals with a 1 V_pp amplitude (A/B sinusoidal encoder tracks).
• A reference signal (zero pulse) per revolution as a differential signal with a 0.5 V_pp amplitude.
• For some types, additionally two sinusoidal signal periods displaced by 90 degrees as differential signals with a 1V_pp amplitude (C/D tracks).

For determining the actual position or angular value, the zero crossings of the sinusoidal encoder tracks are evaluated first (rough evaluation, e.g. totally 4 x 2048 = 8192 zero crossings per revolution). In addition to this, a fine evaluation can be performed by means of an analog detection of the amplitude. By combining the rough and fine evaluation, resolutions of more than 1 million increments can be achieved per encoder revolution.

Examples of typical sin/cos encoders: ERN1387, ERN1381.

Incremental encoder TTL/HTL

Incremental position and speed measuring encoder (в†’ Incremental encoder). In most cases, it outputs two pulse chains (tracks) displaced by 90 degrees with rectangular output signals and often additionally one zero pulse per revolution, respectively. The output signals feature TTL levels (in most cases +5 V RS422 differential signals; TTL = Transistor-Transistor Logic) or HTL levels (+15 or +24 V logic level; HTL = High Level Transistor Logic).

Line filter

Line filters are filters in the converter input which protect the network from harmonic loads and/or interference voltages created in the converter.

Line filters can be passive or active filters, for the lower-frequency harmonics (designated with the term line feedback) with 5, 7, 11, 13, etc. times the line frequency, and also filters for high frequency interference voltages from 10 kHz onward (i.e. RFI suppression filters).

With SINAMICS, the term line filter only designates passive RFI suppression filters.

Line Module

A Line Module is a power component which creates the DC link voltage for one or several в†’ Motor Modules from a three-phase line voltage.

The following three Line Module types are used for SINAMICS:

в†’ Basic Line Module, в†’ Smart Line Module and в†’ Active Line Module.

Line reactor

Line reactors are used for reducing the line-side harmonic currents and harmonic effects. With the в†’ Active Line Modules, line reactors are used as an additional energy storage.

Line-side power components

Power components arranged between the line and the converter unit, such as line reactors, line filters, line contactors.

Liquid cooling

Liquid cooling is a cooling method for SINAMICS power modules and is only available for the в†’ Chassis units. For this cooling method, a liquid cooler with inlet and outlet nozzles is permanently integrated. The specifications quoted by Siemens AG are applicable to the liquid quality, volumetric flow (quantity of liquid per time unit) and liquid pressure. Liquid cooling can also be retrofitted by the customer in the case of the в†’ Cold plate cooling method.

Motor

For the electric motors which can be driven by SINAMICS, a principle distinction is made between rotary and linear motors with regard to their moving direction, and between synchronous and asynchronous (induction) motors with regard to their electromagnetic operating principle. For SINAMICS, the motors are connected to a в†’ Motor Module.

See в†’ Synchronous motor, в†’ Asynchronous (induction) motor, в†’ Motor encoder.

Motor with DRIVE-CLiQ

The motors with в†’ DRIVE-CLiQ comprise of a motor, encoder and an integrated encoder evaluation system. To operate these motors, a power cable and a в†’ DRIVE-CLiQ cable must be connected to the в†’ Motor Module.

Motor encoder

An в†’ Encoder integrated in the motor or built on the motor, e.g. в†’ Resolver, в†’ Incremental encoder TTL/HTL or в†’ Incremental encoder sin/cos 1 V_pp.

The encoder detects the motor speed and, in the case of synchronous motors, also the rotor position angle (of the commutation angle for the motor currents).

For drives without an additional в†’ Direct measuring system, it is also used as a position encoder for position controlling.

Motor Module

A Motor Module is a power unit (DC‑AC inverter) ensuring the power supply for the connected motor.

Power is supplied through the в†’ DC link of the drive group.

A Motor Module must be connected to a в†’ Control Unit via в†’ DRIVE-CLiQ. The open-loop and closed-loop control functions of the Motor Module are stored in the Control Unit.

There are в†’ Single Motor Modules and в†’ Double Motor Modules.

Motor potentiometer

This function is used to simulate an electromechanical motor potentiometer for setpoint input. The setpoint is adjusted via one control command for "higher" and one for "lower".

Motor-side power components

Power components arranged between the converter unit and the motor, e.g. output filters, output reactors, etc.

Optimized pulse patterns

Complicated modulation procedure of a converter gating unit, where the voltage pulses are arranged in such a way that the output current has a sinusoidal curve at an optimum aproximation. This is of primary importance for achieving a high gate factor and a particularly slow torque ripple.

Output reactor

Reactor (inductance) in the converter or inverter output for reducing the capacitive charge/discharge currents of long power cables.

Power Module

A Power Module is an AC-AC converter, which does not have a built-in в†’ Control Unit.

Power supply unit

This component provides electric energy for electric and electronic components.

For SINAMICS, all components are internally connected via 24 V terminals or rails.

The power supply can be ensured by a power supply unit available on the market (e.g. SITOP power) or via a conventional в†’ Control Supply Module.

PROFIBUS

Field bus in accordance with the IEC 61158 standard, sections 2 to 6.

PROFIdrive

This PROFIBUS profile was specified for speed-controlled and position-controlled drives by PNO (PROFIBUS user organisation).

The PROFIdrive V3 profile is the latest version.

PROFINET

This is an open component-based industrial communication system using в†’ Ethernet for distributed automation systems.

Resolver

Mechanically and electrically very robust and cost-efficient в†’ Motor encoder which does not require any incorporated electronics and which operates according to a fully electromagnetic principle: one sine and cosine signal, respectively, are induced in two coils displaced by 90 degrees. The resolver delivers all signals required for speed-controlled operation of the converter or for position control. The number of sine and cosine periods per revolution is equal to the number of pole pairs of the resolver. In the case of a 2-pole resolver, the evaluation electronics may output an additional zero pulse per encoder revolution. This zero pulse ensures a unique assignment of the position information in relation to an encoder revolution. A 2-pole resolver can be used as a single-turn encoder.

2-pole resolvers are suitable for motors with any pole number. In the case of multi-pole resolvers, the pole pair number of the motor and of the resolver are always identical. For this reason, multi-pole resolvers ensure a higher resolution than 2-pole resolvers.

Safe Brake Control

Function associated with в†’ Safety Integrated.

For SINAMICS в†’ Booksize units the motor holding brake is controlled through two channels each with an electronic switch in the +24 V channel and in the ground channel. Both of these channels are monitored. If one of the two channels fails, then this is detected and signaled. For the Booksize drive units, the braking cables are integrated into the power cable.

See в†’ Brake control.

Safe Brake Relay

Certified components for the safe control of a 24 V brake coil.

See в†’ Brake Relay.

Safe standstill

Function of в†’ Safety Integrated.

In case of an error or in combination with a machine function, this function is used to safely disconnect the torque-generating energy flow to the motor. This procedure is executed drive-specific and contactless. See в†’ Safety Integrated.

Safety Integrated

These safety functions are integrated into the products and ensure efficient personal and machine protection in accordance with the EC 98/37/EG machinery directive.

By means of the integrated safety functions, the requirements of safety class 3 in accordance with EN 954-1 can be met in a simple and efficient way.

Sensor Module

Hardware module for evaluating speed/position encoder signals.

Single Motor Module

A Single Motor Module is a в†’ Motor Module to which one single motor can be connected and operated.

See also в†’ Double Motor Module.

Sinusoidal filter

The sinusoidal filter is connected to the converter or inverter output on the motor side. This filter has been designed for the generation of a converter output voltage with an almost sinusoidal shape.

This method protects motors whose isolation system could be damaged by voltage peaks.

In addition to this, a shielded в†’ Power cable is not required in many cases.

Sinusoidal filters are often required in the chemical industry, e.g. to ensure that the permissible insulation voltage in the motor terminal box is not exceeded.

SIZER for Siemens Drives

SIZER for Siemens Drives is a tool for configuring the SINAMICS and MICROMASTER drive systems. SIZER for Siemens Drives assists with the correct technical specifications for the drive systems and selection of the drive components required for the system.

See в†’ STARTER.

Skip frequency band

A skip frequency band is a speed/frequency setpoint range in which the drive must not be operated. The upper and lower limits of the skip frequency band can be parameterized. If a signal value is entered from an external or internal setpoint source within the skip frequency band, this signal value is replaced by one of the skip frequency limits. This function allows for the suppression of undesirable mechanical resonant oscillation by suppressing those speeds which could possibly excite this type of resonant oscillation.

Smart Line Module

Unregulated line infeed/feedback unit with a diode bridge for feeding; stall-protected, line-commutated feedback via IGBTs (Insulated Gate Bipolar Transistor).

The Smart Line Modules provides the DC link voltage for the в†’ Motor Module.

STARTER

The STARTER commissioning tool has been designed for the startup and parameterization of drive units. Moreover, diagnostic functions required for service tasks (e.g. PROFIBUS diagnostics, function generator, trace) can be executed.

See в†’ SIZER for Siemens Drives.

Synchronous motor

Synchronous motors run at the same frequency with which they are operated. They do not have a slip (like в†’ Asynchronous (induction) motors). Synchronous motors require different feed forward and feedback control concepts depending on their design to ensure that they can be operated with converters.

Synchronous motors are distinguished by the following features:

• Permanent-magnet/separately excited
• With/without damping cage
• With/without position encoder

Synchronous motors are used for different reasons:

• High drive dynamic response (в†’ Synchronous servo motors)
• High overload capability
• High speed accuracy with exactly specified frequency (SIEMOSYN motors)

Synchronous servo motor

Synchronous servo motors (e.g. 1FK, 1FT) are permanent-magnet в†’ Synchronous motors with position encoders such as an в†’ Absolute encoder. As the moments of self-inertia are low, the drive is extremely dynamic, e.g. because there are no power losses due to the electric resistance of copper in the rotor, a high power density is achieved with a low construction volume. Synchronous servo motors can only be operated in combination with converters. Due to the servo control required for this purpose, the motor current is moment-dependent. The momentary phase relation of the motor current is derived from the (mechanical) rotor position detected by the position encoder.

Terminal Board

Terminal extension module for plugging into a в†’ Control Unit.

With SINAMICS, the Terminal Board TB30 is available with analog and digital I/O terminals.

Terminal Module

Terminal expansion module that snaps onto the installation rail, for installation in the control cabinet.

With SINAMICS, there is, for example, the Terminal Module TM31 available with analog and digital I/O terminals.

Third-party motor

A motor is designated as a third-party motor if its motor data is not known to the drive line-up and it cannot be identified by means of its order number.

The motor data of an external motor is required for commissioning. It must be manually entered in the corresponding parameters.

Topology

The topology describes the structure of a drive system with в†’ Control Unit, в†’ Motor Modules, в†’ Motors, в†’ Encoders, в†’ Terminal Modules, including the connection system.

Travel to a fixed stop

With this function, a motor can be travelled to a fixed stop with a defined torque/force, without any fault message. As soon as the fixed stop is reached, the torque/force defined via paramaters is built up and persists.

Vector control

Vector control (field-oriented control) is a high-performance control type for induction machines. It is based on an exact model calculation of the motor and of two current components which control the flow and the torque by means of software algorithms. In this way, the predefined speeds and torques to be respected and limited accurately and with a good dynamic response.

There are two vector control types:

• frequency control (sensorless vector control)
• speed-torque control with speed feedback (в†’ Encoder).

Voltage Clamping Module

Component which limits the в†’ DC link voltage and therefore also the motor voltages to permissible values in the case of resonance.

With power cables of excessive length, excitation of the system's resonant frequency under adverse conditions can cause overvoltages to develop in the DC link. In such cases, the insulation systems of the connected motors are particularly at risk and partial discharges can occur.

This component must be used if the total length of all power cables exceeds 350 m (shielded cables) and 500 m (unshielded cables).

Voltage Sensing Module

Component which measures the actual line voltage and makes the measured data available via в†’ DRIVE-CLiQ. Used in conjunction with an в†’ Active Line Module for feeding back the actual line voltage value.

It can be mounted on a top-hat rail and also features 2 analog inputs and a connection for a temperature sensor.