Siemens SIPART PS2 Operating Instructions Manual page 137

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
2. Read the initialization parameters from Point 1 into the new positioner.
3. Fix the actuator at its current position mechanically or pneumatically. Use the locking
4. Determine the actual position value. To do this, read the actual position value from the
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
9. If the displayed actual position value differs from the noted value, correct the deviation by
10.The new positioner is ready for operation when the displayed and noted values match.
11.Release the fixing of the actuator.
Second possibility - without communication
1. Fix the actuator at its current position mechanically or pneumatically. Use the locking
2. Determine the actual position value. To do this, read the actual position value on the
3. Dismount the previous positioner from the actuator.
4. Attach the lever arm of the previous positioner to the new positioner.
5. To prevent interference with the ongoing process, initialize the new positioner on an
6. Then dismount the new, initialized positioner from this actuator.
SIPART PS2 with and without HART
Operating Instructions, 02/2016, A5E00074631-AB
assignment tools suitable for this purpose.
function of your mounting kit, if available.
display of the previous positioner. Note down the read value.
the previous positioner.
moving the friction clutch.
function of your mounting kit, if available.
display of the previous positioner. Note down the read value.
Note
Electronics defect
If the positioner's electronics is defective, measure the actual position value with a ruler or
protractor at the actuator or valve. Convert the read value into %. Note down the
converted value.
actuator with a similar stroke or swivel range. Attach the new positioner to this actuator.
Initialize the new positioner.
Commissioning
7.7 Device replacement
137