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Preparing for Operation
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 positioner
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 slip 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 related
maintenance data may show deviations in particular. Therefore
initialization must be performed at the earliest opportunity.
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SIPART PS2 Manual
A5E00074631-03