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Siemens SIPART PS2 6DR52xx User Manual

Page 138

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Operation

138

SIPART PS2 Manual

A5E00074631--06

Fault indication

(symptoms)

possible cause(s)

Remedies

Actuator does not move

Compressed air < 1.4 bar

Set supply air pressure to

> 1.4 bar.

Piezo valve(s) do(es) not

switch (quiet “clicking” can

be heard however when

the + or – button is pressed

Reactor valve(s) closed

(screw(s) at the right-hand

stop)

Open reactor screw(s) (see

leaflet, figure “device view (6)”

by turning it/them

anti-clockwise.

the + or button is pressed

in manual mode).

Dirt in the pneumatic block

Repair (see chapter 5,

page 145) or new device;

integrated fine screen,

also replace and clean.

A piezo valve switches

continuously in stationary

automatic mode (constant

setpoint) and in manual

mode.

Pneumatic leakage in the

positioner – actuator system

Start leakage test in “RUN 3”

(initialization)!!!

Eliminate leakage in the

actuator and/or supply line

If the actuator is intact and the

supply line is leak-tight:

Repair (see chapter 5,

page 145) or new device

Dirt in the pneumatic block

(see above)

see above

Table 7

Fault indication

(symptoms)

possible cause(s)

Remedies

Both piezo valves switch

continuously and

alternately in stationary

automatic mode (constant

Too much slipstick of stuffing

box of control valve or actuator

Reduce slipstick or increase

dead zone of SIPART PS 2

(dEbA parameter) until

oscillation stops.

automatic mode (constant

setpoint) and in manual

mode, actuator oscillates

around a mean value.

Batches (play) in the positioner

-- actuator – control valve

system

Part--turn actuator:

Check if set screw of the

coupling wheel is inserted

firmly

Linear actuator:

Check if lever is connected

firmly to positioning shaft.

Eliminate any other play

between actuator and control

valve.

Actuator too fast

Increase actuating times via

reactor screws.

If fast actuating time is

required, increase dead zone

(dEBA parameter) until

oscillation stops.

SIPART PS 2 does not

“drive” control valve up to

the stop (at 20 mA).

Supply pressure too low.

Load of the feeding controller

or system output is too low.

Increase supply pressure

Interconnect load converter

Select 3/4 transmitter

operation

Table 8

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