electro-pneumatic positioner positioner tzidc ... control the pneumatic actuator. ... and the...

Download Electro-Pneumatic Positioner Positioner TZIDC ... control the pneumatic actuator. ... and the pneumatic actuator’s return spring moves the valve to the defined safe position

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  • Data Sheet10/180.22 EN

    Low operating cost

    Compact design

    Well-proven technology

    Robust and environmentally ruggedized

    Wide operating temperature range -40...+

    Easy to commission, single push-buttonoperating philosophy

    Mechanical position indicator

    ATEX, FM, CSA and IECEx approvals

    For SIL2 safety loops

    Electro-Pneumatic Positioner TZIDCfor 4...20 mA twowire technology

    85 C

    Compact, well-proven, and flexible

  • Electro-Pneumatic Positioner TZIDC 10/180.22 ENfor 4...20 mA twowire technology

    Short description

    TZIDC is an electronically configurable positioner with communication capabilities, mounting to pneumatic linear or rotary actuators. It features a small and compact design, a modular construction, and an excellent costperformance ratio. Fullyautomatic determination of the control parameters and adaptation to the final control element yield considerable time savingsand an optimal control behavior.

    PneumaticsAn I/P module with subsequent pneumatic amplifier is used tocontrol the pneumatic actuator. The wellproven I/P module proportionally converts the permanent electrical positioning signalfrom the CPU into a pneumatic signal used to adjust a 3/3wayvalve. The air flow for pressurizing or depressurizing the actuatoris continuously adjusted. As a result, excellent control isachieved. When reaching the set point, the 3/3way valve isclosed in center position to minimize the air consumption. Fourdifferent pneumatics versions are available: for singleacting ordoubleacting actuators, each with failsafe or failfreezefunction.

    Fail-safe functionIf the electrical power supply should fail, the positioner output 1is depressurized, and the pneumatic actuators return springmoves the valve to the defined safe position. In case of a doubleacting actuator output 2 is additionally pressurized.

    Fail-freeze functionIf the electrical power supply should fail, the positioner output 1(and 2, if applicable) is closed and the pneumatic actuator stops(freezes) the valve in the current position. If compressed airsupply should fail, the positioner depressurizes the actuator.

    OperationThe positioner has a builtin operating panel providing a 2lineLCD and 4 pushbuttons for optimal local configuration, commissioning and operational monitoring. Alternatively, the appropriateconfiguration program and the available communication optionscan be used.

    CommunicationThe standard TZIDC model has a local communication interface(LKS connector). Additionally, a HART communication optionfor communication via the 20 mA signal is available. Both communications are based on the HART Protocol.

    Inputs and outputsIn addition to its input for the analog position set point the TZIDCpositioner is equipped with a digital input which can be used toactivate various protective functions in the device via the processcontrol system. A digital output allows you to output collectivealarms or fault messages.

    Modular designThe TZIDC basic model can be enhanced at any time by retrofitting optional equipment. Option modules for analog or digitalposition feedback or a shutdownmodule can be installed. Additionally, a mechanical position indicator, proximity switches or24 V microswitches are available for indicating the position independently of the mother board function.

    Fig. 1: TZIDC schematic diagram

    LKS connector

    Signal4 20 mA

    Digital input

    Digital output







    Air supply1.46 bar

    Outgoing air

    I/P modulewith 3/3-way valve

    Position sensor

    Plug-in modulefor analog

    position feedback4 20 mA

    Plug-in modulefor digital

    position feedback

    Kit for mechanicalposition indicator

    Kit for position feedbackvia proximity switches



    orPlug-in module

    for safety shutdown(safe position)

    Kit for position feedbackvia 24 V microswitches


    optionally for rotation angle of up to 270


  • Electro-Pneumatic Positioner TZIDC 10/180.22 ENfor 4...20 mA twowire technology


    To linear actuators in accordance with the standardLateral attachment is in accordance with DIN/IEC 534 (lateralattachment to NAMUR). The required attachment kit is a complete set of attachment material, but does not include thescrewed pipe connections and air pipes.

    To rotary actuators in accordance with the standardAttachment to rotary actuators complies with VDI/VDE 3845. Theattachment kit contains the bracket and the respective screwsfor attaching the positioner to the actuator. The adapter for coupling the positioner feedback shaft to the actuator shaft has to beordered separately. Screwed pipe connections and air pipeshave to be provided on site.

    Fig. 2: Mounting to linear actuators to DIN/IEC 534 / NAMUR

    Fig. 3: Integral mounting to control valves

    Integral mounting to control valvesA model of the TZIDC positioner designed for integral mountingwith the required threaded holes at the back (see Fig. 13: Frontand rear view) is also available. The benefit of this design is thatthe point for mechanical stroke measurement is protected andthat the positioner and actuator are linked internally. No externaltubing is required.

    Special actuator-specific mountingIn addition to the mounting methods described above, there arespecial actuatorspecific attachments.

    Please contact us for details.

    Fig. 4: Mounting to rotary actuators to VDI/VDE 3845

    Fig. 5: Integral mounting to control valves by using an adapter panel


  • Electro-Pneumatic Positioner TZIDC 10/180.22 ENfor 4...20 mA twowire technology


    GeneralMicroprocessorbased position control in the TZIDC provides foroptimal results. The positioner features highprecision controlfunctions and high operational reliability. Due to their elaboratestructure and easy accessibility, the device parameters can bequickly adapted to the respective application.

    The total range of parameters includes: Operating parameters Adjustment parameters Monitoring parameters Diagnosis parameters Maintenance parameters

    Operating parameters Signal range

    Minimum signal 4 mA, maximum signal 20 mA (0...100 %)freely selectable for splitrange operation minimum range 20 % (3.2 mA), recommended range > 50% (8.0 mA)

    Action (signal)Direct: Signal 4...20 mA = position 0...100 %Reverse: Signal 20...4 mA = position 0...100 %

    Characteristic curve (travel = f {signal})linear,equal percentage 1:25 or 1:50 or 25:1 or 50:1,or userconfigurable with 20 reference points

    Travel limitThe positioning travel, i.e. the stroke or angle of rotation, can be reduced as required within the full range of 0...100%, provided that a minimum value of 20% is observed.

    Shut-off functionThis parameter can be set separately for each end position. When the respective configured limit value is exceeded, the shutoff function causes immediate travel of the actuator until reaching the set end position. When the shutoff value is set to 0, the position is further controlled, even in the respective end position.

    Travel time prolongationWith this function the max. travel time for full travel can be increased. This time parameter can be set separately for each direction.

    Switching points for the positionThis parameter allows you to define two position limits for signalling (see Options: Module for digital position feedback).

    Digital outputThe alarms generated in the TZIDC positioner can be polled via the digital output as a collective alarm. The desired information can be selected via the operator panel or remotely via the configuration program. The output can be set to active high or active low, as required.

    Digital inputOne of the following protective functions can be selected for the digital input, either via the local operator panel or remotely via the configuration program: no function (default setting) move to 0% position move to 100 % position hold last position disable local configuration disable local configuration and operation disable any access (no local or remote access (via a PC))The selected function is activated once the 24 V DC signal is no longer applied (< 10 V DC).

    Adjustment parametersThe TZIDC positioner has a special function for automatic adjustment of the parameters. Additionally, the control parameters canbe set automatically (in adaptive control mode) or manually tooptimally adapt them to the process requirements.

    Tolerance bandWhen reaching the tolerance band the position is considered as corrected. From this point on, the position is further slowly readjusted until the dead band is reached. The factory setting for this parameter is 0.3 %.

    Dead band When reaching the dead band, the position is held. The factory setting for this parameter is 0.1 %.

    Actuator spring actionSelection of the sensor shaft rotating sense (looking into the open case), if the valve is moved to the safe position by the actuator spring (actuator is depressurized via OUT1). For doubleacting actuators the actuator spring action corresponds to pressurizing the pneumatic output (OUT2).

    Zero positionAdjusting the display (0...100 %) according to the direction of action for opening or closing the valve.


  • Electro-Pneumatic Positioner TZIDC 10/180.22 ENfor 4...20 mA twowire technology

    Monitoring parametersVarious functions for permanent operational monitoring areimplemented in the TZIDC operating program. The followingstates will be detected and indicated: 4...20 mA signal out of range position out of the adjusted range positioning timeout (adjustable time parameter) position controller inactive counter limits (settable in the d


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