Sequence Of Automatic Initialization - Siemens SIPART PS2 6DR5xx0 series Compact Operating Instructions

Electropneumatic positioners

Table of Contents

5.2

Overview

Note

During the initialization process, the operating pressure must be at least one bar more than that required to close or open

•

the valve. However, the operating pressure should not be greater than the maximum permissible operating pressure for

the actuator.

General information about commissioning

1. After installing the positioner on a pneumatic actuator, you must supply electric and pneumatic auxiliary power to it.

2. The positioner is in the "P manual mode" before initialization. At the same time, "NOINI" blinks in the lower line of the

display.

3. Position feedback: You can adjust the range of position detection using the friction clutch if necessary.

4. Adjust the positioner as per the respective actuator with the help of the initialization process and by setting the

parameters. If required, use the "PRST" parameter to cancel the adjustment of the positioner on the actuator. The

positioner is again in the "P manual mode" after this process.

Types of initialization

You can initialize the positioner as follows:

● Automatic initialization:

during automatic initialization, the positioner determines the following one after the other:

–

The direction of action

–

The actuator travel and angle of rotation

–

The travel time of the actuator

The positioner also adjusts the control parameters as per the dynamic response of the actuator.

● Manual initialization:

the actuator travel and the angle of rotation of the actuator are set manually. The remaining parameters are automatically

determined. This function is useful for valves which are lined, for example, with PTFE.

● Copying the initialization data when replacing a positioner:

the initialization data of a positioner can be read and copied into another positioner. A defective device can thus be

replaced without interrupting an ongoing process through initialization.

You have to define a few parameters for the positioner before initialization. Owing to the preset values, you cannot adjust

further parameters for initialization.

You can use a suitably configured and activated binary input to protect the configured settings against accidental

adjustment.

5.3