ABB 07KR31 FPR36000227R1202-S programmable processor unit

1.1.2 “Fail-freeze” function

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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.

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1.2 Operation

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The positioner has a built-in operating panel providing a 2-line LCD

and 4 pushbuttons for optimal local configuration, commissioning and

operational monitoring.

Alternatively, the appropriate configuration program and the available

communication option can be used.

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1.3 Communication

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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

communications are based on the HART Protocol.

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1.4 Inputs and outputs

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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.

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1.5 Modular design

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The TZIDC basic model can be enhanced at any time by retrofitting

optional equipment. Option modules for analog or digital position

feedback or a shutdown-module 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

3.1.2 Adjustment parameters

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The TZIDC positioner has a special function for automatic adjustment

of the parameters.

Additionally, the control parameters can be set automatically (in

adaptive control mode) or manually to optimally adapt them to the

process requirements.

Tolerance band

When 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 (sensitivity)

When reaching the dead band, the position is held. The factory

setting for this parameter is 0,1 %.

Actuator spring action

Selection 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 Y1/OUT1).

For double-acting actuators the actuator spring action corresponds to

pressurizing the pneumatic output (OUT2).

Display 0 ... 100 %

Adjusting the display (0 ... 100 %) according to the direction of action

for opening or closing the valve