Month: September 2025

Features and Benefits

■ Inputs: 120/240 VAC or

125 VDC power feeds allowing

mixed AC and DC operation.

■ Outputs: Provides Harmony sys

tem power of 5. +15. and 24

VDC and field power of 24. 48 and 125 VDC.

■ Availability: Built-in power dis

tribution schemes support

single and dual (main and auxil

iary, AC and DC) power feeds

for 2N power configurations.

ControlIT

Modular Power System III

■ Reliability: Automatic load shar

ing of dual supplies reduces the

burden on an individual supply,

increasing the overall reliability and high MTBF.

■ Serviceability: Local status indi

cators, disconnects, and plug-in

cable assemblies facilitate on

line fault isolation and replacement.

■ Monitoring: Provides system DC

power outputs, field power out

puts, fan status, and cabinet

temperature monitoring.

■ Industrial Quality: Designed for

operating temperatures as high

as 70o C (inside cabinet) as well

as MIL-STD ratings for vibra

tions, IEC standards for EMI and

RFI, and UL ratings for flammability.

■ Price/Performance: Power factor

correction, electronic output

protection and lower costs are

inherent features.

■ Upward Compatibility: Compact

design allows for use in the new

standard ABB cabinets and as

replacement for older power

systems supplied with

Symphony™ and INFI 90® OPEN systems.

The Modular Power System III (MPS III) is specifically

designed for powering Harmony rack modules and associ

ated field mounted devices. The MPS III can provide 5. +15.

and 24 VDC system power as well as 24. 48. and 125 VDC for

field powered devices. Special features of the MPS III

include: power factor correction, on-line power supply

replacement, power and cooling status monitoring, and

adaptability to various power input sources. The MPS III

assembly includes all the hardware necessary for AC input

power distribution to the individual power supplies, DC out

put distribution, power and fan monitoring, interconnecting

cables, and cabinet mounting hardware.

A family of preconfigured power supplies has been engi

neered to provided various combinations of voltage options

and associated power ratings. The MPS III is designed to sup

port 2N power redundancy. Multiple preconfigured power

supply configurations are available to facilitate matching the

most cost-effective solution with project power requirements.

Detailed specifications relating to these supplies are listed in

the MPS III data sheet.

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.

The TZIDC-200 is a variant designed with a flameproof enclosure as explosion protection concept.

The integrated I/P module with subsequent pneumatic amplifier is used to control the attached pneumatic actuator.

The SIL Safety Function is intended to open or close actuator/valves assemblies as emergency application.

By providing 0 mA as control/setpoint signal the positioner depressurizes the fail-safe actuator which return spring moves the valve

to a predefined, safe end position (either OPEN or CLOSED).

Figure 1 is demonstrating the safety instrumented function as example on a Tank Overfill Protection.

The TZIDC pneumatic system can be supplied in four versions: for single acting or double acting actuators and each with the ‘fail

safe’ or ‘fail-freeze’ safety behavior.

The SIL Safety Function is limited to the version: ‘single-acting, fail safe‘ in conjunction with pneumatic fail-safe actuators with

spring-return mechanism.

The table below is demonstrating the safety instrumented functions provided by ABBs Positioner TZIDC & EDP300 as informational

comparison:

The order variant ‘CS2 – SIL 2 Declaration of Conformity‘ is capable to meet the SIL safety requirements for the integration in Safety

Instrumented Systems in compliance to IEC 61508-2 within the process industry sector according to IEC 61511.

The area of safety applications is limited to:

• up to SIL 2

• as Low Demand Mode of operation

with further constraints as stated within this safety manual.

In case of questions and detected safety critical device failures please contact the ABB Customer Service Center by stating the

´Product Type Designator´ and ´Functional Safety SIL´ as request headlines.

Additional instructions for

IEC 61508 compliant devices

from HW Rev. 05.xx

Introduction

Safety Manual for TZIDC / TZIDC-200 digital

Positioner.

The TZIDC / TZIDC-200 is an intelligent digital

positioner for communication via HART within the

positioner product range.

Application area

The TZIDC is an electronically configurable 2-wire 4 to 20 mA valve positioner with HART® communication capabilities designed for

mounting on pneumatic linear or rotary actuators.

The TZIDC-200 is a variant designed with a flameproof enclosure as explosion protection concept.

The integrated I/P module with subsequent pneumatic amplifier is used to control the attached pneumatic actuator.

The SIL Safety Function is intended to open or close actuator/valves assemblies as emergency application.

By providing 0 mA as control/setpoint signal the positioner depressurizes the fail-safe actuator which return spring moves the valve

to a predefined, safe end position (either OPEN or CLOSED).

Figure 1 is demonstrating the safety instrumented function as example on a Tank Overfill Protection.

The TZIDC pneumatic system can be supplied in four versions: for single acting or double acting actuators and each with the ‘fail

safe’ or ‘fail-freeze’ safety behavior.

The SIL Safety Function is limited to the version: ‘single-acting, fail safe‘ in conjunction with pneumatic fail-safe actuators with

spring-return mechanism.

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.

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.

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.