Commissioning
9.5 Copying the initialization data when replacing a positioner
SIPART PS2 with PROFIBUS communication
Operating Instructions, 09/2007, A5E00127926-07
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9.5
Copying the initialization data when replacing a positioner
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Electropneumatic positioners can be replaced in a running system without interrupting the
process.
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By copying and transferring the device and initialization data, it is possible to commission
a replacement positioner without needing to initialize it.
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An electropneumatic positioner uses the communication interface to transfer data.
NOTICE
Deferred initialization
Initialize the replacement positioner as soon as possible. The following properties can
be ensured only after initializing:
•
Optimum adjustment of the positioner as per the mechanical and dynamic properties
of the actuator.
•
Unrestricted accuracy and dynamic behavior of the positioner.
•
Deviation-free position of the hard end stops
•
Correctness of the maintenance data
Copying the initialization data
Copy the initialization data and the device parameters as follows:
1.
Read in the initialization data and the device parameters of the positioner to be replaced.
Use a suitable parameterization tool for this purpose.
2.
Save the data in the parameterization tool.
Note
If the positioner to be replaced has already been initialized or configured using the
parameterization tool, you need not read in and save the device data.
Replacing the positioner
Proceed as follows to replace a positioner in a running system:
1.
Fix the actuator at its current position mechanically or pneumatically.
2.
Determine the actual position value.
–
Read the actual position value on the digital display of the positioner to be replaced.
Note down the read value.
–
If the electronic unit of the positioner is defective, measure the actual position value at
the actuator or the valve. Note down the measured value.
3.
Dismantle the positioner.
4.
Attach the lever arm of the positioner to be replaced to the replacement positioner.
5.
Install the replacement positioner on the control valve.
6.
Set the transmission ratio selector of the replacement positioner to the same position as
that of the positioner to be replaced.
