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ABB Electro-Pneumatic Positioner TZIDC

Electro-Pneumatic Positioner TZIDC

for 4…20 mA twowire technology

Short description

TZIDC is an electronically configurable positioner with communi cation capabilities, mounting to pneumatic linear or rotary actua tors. It features a small and compact design, a modular construction, and an excellent costperformance 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 wellproven I/P module pro portionally converts the permanent electrical positioning signal

from the CPU into a pneumatic signal used to adjust a 3/3way 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 3/3way valve is closed in center position to minimize the air consumption. Four different pneumatics versions are available: for singleacting or

doubleacting actuators, each with “failsafe” or “failfreeze” function.

“Fail-safe” function

If the electrical power supply should fail, 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 output 2 is additionally pressurized.

“Fail-freeze” function

If 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 air

supply should fail, the positioner depressurizes the actuator.

Operation

The positioner has a builtin operating panel providing a 2line LCD and 4 pushbuttons for optimal local configuration, commissioning and operational monitoring. Alternatively, the appropriate

configuration program and the available communication options can be used.

Communication

The standard TZIDC model has a local communication interface (LKS connector). Additionally, a “HART communication” option for communication via the 20 mA signal is available. Both com

munications are based on the HART Protocol.

Inputs and outputs

In addition to its input for the analog position set point the TZIDC positioner is equipped with a digital input which can be used to activate various protective functions in the device via the process

control system. A digital output allows you to output collective alarms or fault messages.

Modular design

The TZIDC basic model can be enhanced at any time by retrofitting optional equipment. Option modules for analog or digital position feedback or a shutdownmodule can be installed. Additionally, a mechanical position indicator, proximity switches or 24 V microswitches are available for indicating the position independently of the mother board function.

Series Name: ABB Electro-Pneumatic Positioner TZIDC
ABB (3)
Product Keywords: Positioner,TZIDC