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Siemens SIPART PS2 6DR52xx User Manual

Page 114

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Operation

114

SIPART PS2 Manual

A5E00074631--06

Slipstick effect
This parameter is used to activate the function for the detection of a

slipstick effect. The device tries to detect sudden changes of the valve

position that indicate excess slipstick. If the device detects a slipstick,

the filtered step is saved as slipstick value. When the valve moves

normally again (without detection of a slipstick), the slipstick value is

reduced slowly.
Note that to avoid misinterpretations, for actuators with actuating times

below 1 s, the positioner cannot distinguish reliably between a normal

movement and a sudden change.

Limit for the slipstick detection
Sets the limit for a step caused by a slipstick effect. The limit can be

set within the range of 0.0 to 100.0%. Factory setting for the limit is 1.0.

Factor 1
Input of the factor for the threshold 1 error message. This factor refers

to the limit for the slipstick detection. Factory setting for factor 1 is 2.0.

That means, for d1.LIMIT = 1.0 and factor 1 = 2.0, the first slipstick

error message is triggered when the current slipstick value has reached

2.0.

Factor 2
Input of the factor for the threshold 2 error message. This factor refers

to the limit for the slipstick detection. Factory setting for factor 2 is 5.0.

That means, for d1.LIMIT = 1.0 and factor 2 = 5.0, the second slipstick

error message is triggered when the current slipstick value has reached

5.0.

Factor 3
Input of the factor for the threshold 3 error message. This factor refers

to the limit for the slipstick detection. Factory setting for factor 3 is 10.0.

That means, for d1.LIMIT = 1.0 and factor 3 = 10.0, the third slipstick

error message is triggered when the current slipstick value has reached

10.0.

d. STIC

d1.LIMIT

d2.FACT1

d3.FACT2

d4.FACT3

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