ABB 07AC91D 07AC91 analog input/output unit

Low operating cost

Compact design

Well-proven technology

Robust and environmentally ruggedized

Wide operating temperature range

-40 ... 85 °C (-40 ... 185 °F)

Easy to commission, “single pushbutton”

operating philosophy

Mechanical position indicator

ATEX, FM, CSA, GOST and IECEx approvals

For SIL2 safety loops

Compact

Description

Pos: 3.2 /==== Wechsel ein- auf zweispaltig ==== @ 0mod_1130421847171_3101.doc @ 3828

PWoesc: h3s.e3l /eTienc-ahunfi szcwheei sDpaatleting / Datenblatt/Aktorik/Stellungsregler/Allgemein/Kurzbeschreibung/Kurzbeschreibung @ 10mod_1173180169769_3101.doc @ 71118

The TZIDC is an electronically configurable positioner with

communication capabilities designed for mounting to pneumatic

linear or rotary 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.

Pos: 3.4 /Überschriften/1.1/2-spaltig/Pneumatik @ 10mod_1176211138453_3101.doc @ 76683

1.1 Pneumatics

Pos: 3.5 /Technische Daten / Datenblatt/Aktorik/Stellungsregler/Allgemein/Kurzbeschreibung/Pneumatik @ 10mod_1173180645393_3101.doc @ 71139

a

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 positioning 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 set point, 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.

Pos: 3.6 /Überschriften/1.1.1/2-spaltig/Sicherheitsfunktion "entlüftend" @ 10mod_1176211744343_3101.doc @ 76809

1.1.1 “Fail-safe” function

Pos: 3.7 /Technische Daten / Datenblatt/Aktorik/Stellungsregler/Allgemein/Kurzbeschreibung/Sicherheitsfunktion "entlüftend" @ 10mod_1176211673796_3101.doc @ 76788

If the electrical power supply 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.