6DR50XX Ver la hoja de datos (PDF) - Siemens AG

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6DR50XX

SIPART PS2

Siemens AG 

Design and Functional Principle

Design and Method of Operation

2

The following chapter describes the mechanical and electrical design,

the instrument components and method of operation of the positioner.

2.1 Overview

Introduction

SIPART PS2 Manual

A5E00074631--06

The electropneumatic positioner forms a control system in connection

with an actuator. The current position of the actuator is detected by a

servo potentiometer and fed back as actual value x. The setpoint and

actual value are output simultaneously on the display.

The setpoint w is formed by a current fed to the positioner which at

the same time serves to supply the positioner in two-wire operation.

In 3/4-wire operation the supply comes from a 24 V voltage input.

The positioner operates as a predictive five-point switch by the output

variable ±∆y of which the integrated actuating valves are controlled with

pulse length modulation.

These actuating signals cause fluctuations in pressure in the actuator

chamber(s) and thus adjustment of the actuator until the control error is

zero.

Operation (manual) and configuration (structuring, initialization and

parameterization) is effected by three keys and a display with the hous-

ing cover removed.

The standard controller has one digital input (DI1). This can be config-

ured individually and can be used for blocking the operating modes for

example.

With the Iy-option module, the current actuator position can be output

as a two wire signal Iy = 4 to 20 mA.

In addition the actuator can be monitored for two programmable limit

values which respond on exceeding or dropping below the stroke or

angle of rotation.

The limit value alarms are output by the alarm option module which can

monitor and report the function of the positioner and the actuator addi-

tionally through a fault message output. The value of the control differ-

ence dependent on the travel time is monitored in automatic mode. The

fault signal is always set when the control error cannot be leveled after

a certain time because for example the valve is blocked or the mains

pressure is insufficient. The three digital outputs are implemented as

semiconductor outputs and are error self-reporting, i.e. the outputs re-

15

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