Siemens SIPART PS2 6DR50xx Manual page 98

Operation
.
1.YFCT
98
Normally adjustment of the first three following parameters is com-
pletely sufficient to enable a positioner to be operated by an actuator.
If you wish to become familiar with all details of the positioner, try out
incrementally the effects of the remaining parameters by selective
trials.
NOTE
In particular if the positioner has previously been operated using a
different actuator, it must always be reinitialized in order to restore the
factory settings. Only in this way can the positioner matching process
start from known conditions. The parameter "55.PRST" is provided for
this purpose.
This is also recommended if multiple parameters have been changed
in a single session, the effects cannot be assessed and unintended
consequences may result.
Positioning actuator type
This is to match the positioner with the respective actuator and where
necessary to the position sensor being used. The following adjustment
capabilities are provided:
YFCT = turn
S
This adjustment is necessary for the part-turn actuator.
If "turn" is selected, the following parameter "2. YAGL" is automati-
cally set to 90_ and cannot be changed.
YFCT = WAY (Factory setting)
S
This is necessary for a linear actuator. This allows the positioner to
compensate for the non-linearity that arises due to the conversion of
the linear movement of the linear actuator into the part-turn move-
ment of the feedback shaft. For this the positioner is factory set so
that it shows between "P 49.0 and P 51.0" when the arm on the
feedback shaft is vertical to the linear actuator spindle.
YFCT = LWAY
S
This must be adjusted, if an external linear potentiometer is to be
connected to a linear actuator.
TIP: use this adjustment also for part-turn actuators with reverse
direction of control action.
YFCT = ncSt
S
Use this when an NCS is fitted to a part-turn actuator.
YFCT = -ncSt
S
This must be set when an NCS is used with a part-turn actuator with
reverse direction of control action.
YFCT = ncSL
S
This must be set when an NCS is used with a linear actuator.
SIPART PS2 Manual
A5E00074631--06