Device Replacement - Siemens SIPART PS2 Operating Instructions Manual

Commissioning

7.9 Device replacement

7.9 Device replacement
Introduction
Note
Initialization
The positioner can be replaced without having to interrupt ongoing processes. However,
copying and transferring of the initialization parameters only allows an approximate adjustment
of the positioner to your actuator. Following initialization, the positioner initially works with the
manually defined parameters.
● For this reason, an automatic or manual initialization should be carried out as soon as
possible.
Note
Deferred initialization
Initialize the new 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.
● Non-deviating position of endstops
● Correctness of the maintenance data
There are two ways of replacing a positioner when the equipment is in operation, without having
to interrupt the process. The two options depend on whether your positioner has
communication.
First possibility - with communication
1. Read the initialization parameters from the previous positioner. Use the parameter
assignment tools suitable for this purpose.
2. Transfer the initialization parameters read in the parameterization software under Point 1
into the new positioner.
3. Fix the actuator at its current position mechanically or pneumatically. Use the locking
function of your mounting kit, if available.
4. Determine the actual position value. To do this, read the actual position value from the
display of the previous positioner. Note down the read value.
5. Dismount the previous positioner from the actuator.
6. Attach the lever arm of the previous positioner to the new positioner.
7. Mount the new positioner on the actuator.
8. Set the transmission ratio selector of the new positioner to the same position as that of the
previous positioner.
9. If the displayed actual position value differs from the noted value, correct the deviation by
moving the friction clutch.
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SIPART PS2 with PROFIBUS PA
Operating Instructions, 05/2019, A5E00127926-AC