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Siemens SIPART PS2 6DR52xx User Manual

Page 87

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Preparing for Operation

87

SIPART PS2 Manual

A5E00074631--06

3.7 Copying initialization data (positioner exchange)

With this function you have the possibility of starting up a positioner

without running the initialization routine. This allows for example a posi-

tioner to be changed on a running system in which automatic or manual

initialization cannot be performed without disturbing the process.

NOTICE
Initialization (automatic or manual) should be performed as soon as

possible afterwards because only then can the positioner be optimally

adapted to the mechanical and dynamic properties of the actuator.

Data are transmitted from the positioner to be replaced to the

replacement instrument via the HART®- communication interface.
The following steps must be performed to exchange a positioner:
1. Read in and save instrument parameters and initialization data

(determined in initialization) of the instrument to be replaced with

PDM (Process Device Manager). This step is unnecessary if the

instrument has been parameterized with PDM and the data have

already been stored.

2. Fix the actuator in its momentary position (mechanical or

pneumatic).

3. Read and note the current position actual value of the positioner to

be changed. If the electronics are defective, determine the current

position by measuring on the actuator or valve.

4. Disassemble the positioner. Mount the lever arm of the positioner

on the replacement instrument. Mount the replacement instrument

on the fitting. Move the transmission ratio selector to the same

position as the defective instrument. Copy the instrument data and

initialization data from the PDM or handheld.

5. If the displayed actual value does not match the noted value of the

defective positioner, set the correct value with the friction clutch.

6. The positioner is now ready to operate.

The accuracy and dynamic behavior may be restricted in relation

to correct initialization. The position of the hard stops and the rela-

ted maintenance data may show deviations in particular. Therefore

initialization must be performed at the earliest opportunity.

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