Category: Industry Trends

The positioner safety function is declared as Type A element

with HFT=0 according to IEC 61508 capable to be used for SIL

Functional Safety Functions up to SIL 2.

According to IEC 61508-2. 7.4.7.4 a useful lifetime, based on

experience should be assumed.

The components of the positioner do not contain any specific

components with a reduced useful lifetime that are contributing

to the dangerous undetected failure rates.

Because the positioner is a moving masses system supplied by

instrumented air the final device usage and environmental

operating conditions (e.g., no/many open-close cycles,

good/bad supply air quality) will have an impact on the usefullifetime.

Therefore, the useful lifetime should be evaluated by the end

user according to the final plant experience data.

The Periodic Proof-Test methods within chapter Periodic Proof

Test and Maintenance on page 9 are suggested to validate the

correct safety function.

When final plant experience, proof testing and related field

monitoring data indicates a limiting useful lifetime by related

operating conditions, then the plant experience-based lifetime

must be used and considered on the failure rates, proof-test

intervals, and replacement intervals.

The safety function is activated if the electrical 4 to 20 mA

setpoint signal is set to 0 mA. This 0 mA signal might be forced

as direct logic solver/DCS output or by an additional electrical

open/close switch within the 4 to 20 mA setpoint line.

As reaction on the 0 mA signal the electronics, firmware &

position measurement is deactivated and bypassed, and the

mechanical pneumatic system of the positioner will be

depressurized into the fail-safe position.

The return spring of the attached pneumatic actuator will move

the valve to a safe end position (OPEN or CLOSED) subsequently.

The final safe state is achieved if the valve is located in the safe end position.

The time taken to reach the expected safe end position at the

process valve is only partly determined by the positioner; it is

also dependent on the attached actuator and valve assembly and

further external conditions, therefore the correct safety function

as expected within the final application must be checked during

installation & commissioning and the end user is responsible to

validate whether the safe state is achieved in the expected

direction and within the expected time frame.

Operating parameters

The following operating parameters can be set manually if required:

Setpoint signal

0 … 100 % freely selectable for split-range operation

For 4 … 20 mA and HART version:

— Signal min. 4 mA, max. signal 20 mA (0 … 100%)

— Min. range 20 % (3.2 mA)

— Recommended range > 50 % (8.0 mA)

Action (setpoint signal)

Increasing:

Position value 0 … 100 % = direction 0 … 100 %

Decreasing:

Setpoint signal 100 … 0% = direction 0 … 100%

Characteristic curve (travel = f {setpoint signal})

Linear, equal percentage 1:25 or 1:50 or 25:1 or 50:1 or freely

configurable with 20 reference points.

Device parameters

General remarks

Microprocessor-based position control in the positioner

optimizes control. The positioner features high-precision

control functions and high operational reliability. Due to their

elaborate structure and easy accessibility, the device

parameters can be quickly adapted to the respective

application.

The total range of parameters includes:

— Operating parameters

— Adjustment parameters

— Monitoring parameters

— Diagnostics parameters

— Maintenance parameters

Travel limit

The 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.

“Fail-safe” function

If the electrical supply power fails, the positioner output 1 is

depressurized, and the pneumatic actuator’s return spring

moves the valve to the defined safe position. In case of a

double-acting actuator the second output 2 is additionally pressurized.

Change from two to one column

“Fail-freeze” function

If the electrical supply power fails, the positioner output 1 (and

2. if applicable) is closed and the pneumatic actuator stops

(“freezes”) the valve in the current position. If the compressed

air supply power fails, the positioner depressurizes the actuator.

Brief description

The TZIDC-200 is an electronically configurable positioner with

communication capabilities designed for mounting to

pneumatic linear or part-turn actuators. It features a small and

compact design, a modular construction, and an excellent

cost-performance ratio.

Fully automatic determination of the control parameters and

adaptation to the final control element yield considerable time

savings and an optimal control behavior.

Pneumatics

An I/P module with subsequent pneumatic amplifier is used to

control the pneumatic actuator. The well-proven I/P module

proportionally converts the permanent electrical setpoint signal

from the CPU into a pneumatic signal used to adjust a 3/3 way valve.

The air flow for pressurizing or depressurizing the actuator is

continuously adjusted. As a result, excellent control is

achieved. When reaching the setpoint, the 3/3-way valve is

closed in center position to minimize the air consumption.

Four different pneumatics versions are available: for single

acting or double-acting actuators, each with “fail-safe” or “fail freeze” function.

For highly precise and reliable valve

positioning in all industries

Easy Set-Up

— Auto-adjust function

— Simple initialization

Easy handling

— ABB common look and feel

Control adaptive function

— Automatic adjustment of control parameters during

operation

High shock and vibration immunity

— Gearless sensor activation

Fail save and fail freeze function

— Selectable safe position of valve

Low air consumption

— Efficient I/P converter

Change from one to two columns

Monitoring of process parameters

— Numerous diagnostic functions available

HART-protocol

Global approvals for explosion protection

— ATEX

— IECEx

— FM, CSA

— EAC TR-CU-012

Wide temperature range

— -40 … 85 °C (-40 … 185 °F)

Applicable for nearly all actuators and valves

— Suitable for all pneumatic actuators

— Suitable for rotary and linear actuators

— Suitable for all actuator sizes

ABB general purpose drives

ABB general purpose drives are simple to

buy, install, configure and use, saving

considerable time. They are widely available

through ABB channel partners. The drives

have common user and process interfaces

with fieldbuses, common software tools for

sizing, commissioning, maintenance and

common spare parts.

Applications

ABB general purpose drives can be used in a

wide range of industries. Typical applications

include pump, fan and constant torque use,

such as conveyors. ABB general purpose drives

are ideal in those situations where there is

a need for simplicity to install, commission

and use and where customizing or special

product engineering is not required.

Highlights

• FlashDrop tool

• Intuitive use with assistant control panel

• Swinging choke for superior

harmonic reduction

• Vector control

• Coated boards for harsh environments

• Built-in category C2 EMC filter

(1st environment) as standard

• Flexible fieldbus system with built-in

Modbus and numerous internally

mountable fieldbus adapters

• UL, cUL, CE, C-Tick and GOST R approved

• RoHS compliant

Easy and quick commissioning

Advanced data storage inside the sensor eliminates the need

to match sensor and transmitter in the field. The on-board

sensor memory automatically identifies the transmitter. On

power-on, the transmitter self-configuration function is run and

replicates all sensor data and TAG specific parameters into

the transmitter. This eliminates the opportunity for errors and

leads to an increased startup speed and reliability.

Intuitive, convenient navigation

The factory-set parameters can be modified quickly and easily

via the user-friendly display and the non-contact buttons,

without opening the housing.

The “Easy Set-up” function reliably guides unpracticed users

through the menu step by step.

The softkey-based functionality makes handling a breeze – it’s

just like using a cell phone. During the configuration, the

permissible range of each parameter is indicated on the

display and invalid entries are rejected.

Universal transmitter – powerful and flexible

The backlit display can be easily rotated without the need for

any tools. The contrast is adjustable and the display fully

configurable. The character size, number of lines and display

resolution (number of decimals) can be set as required. In

multiplex operation, several different display options can be

pre-configured and invoked one after the other.

The smart modular design of the transmitter unit allows for

easy disassembly without the need to unscrew cables or

unplug connectors.

Whether count pulses, 20 mA signals or the status output are

active or passive, the universal transmitter always delivers the

correct signal. HART is used as the standard protocol.

Optionally, the transmitter is available with PROFIBUS PA or

FOUNDATION Fieldbus communication.

The universal transmitter simplifies the spare parts inventory

and reduces the stockholding costs.

Advanced diagnostic functions

Using its advanced diagnostic functions, the device monitors

both its own operability and the process.

Limit values for the diagnostic parameters can be set locally.

When these limits are exceeded, an alarm is tripped.

For further analysis, the diagnostic data can be read out via

an advanced DTM. Critical states can, thus, be recognized

early and appropriate measures can be taken.

As a result, productivity is increased and downtimes are

avoided. The status messages are classified in accordance

with the NAMUR recommendations.

In the event of an error, a diagnostic-dependent help text

appears on the display which considerably simplifies and

accelerates the troubleshooting procedure. The gives

maximum safety for the process.

Flow performance

Using a higher excitation frequency for the transmitter,

ProcessMaster is a flowmeter with an especially short

response time. With its advanced filtering methods, the device

improves accuracy even under difficult conditions by

separating the noise from the measuring signal. This leads to

a maximum measuring error of 0.2 % of rate. Self-cleaning,

double-sealed polished measuring electrodes enhance the

device’s reliability and performance.