Procedure for commissioning the booster
1. Check whether the restrictor(s) on the positioner are completely open. With a new
positioner, the restrictors are factory-set to open. The position of the restrictors is shown in
the figure in section Device components (Page 28).
2. Set '34.DEBA' Deadband of closed-loop controller (Page 150) to the largest value
permissible for your process. The largest value is usually 0.5.
3. Start the automatic initialization process as described under Commissioning (Page 105).
4. With RUN 3, the initialization is stopped for five seconds. During these five seconds, start
the function for setting the booster using the
button.
A cycle is started which continuously determines the overshoots. The values 'oSuP' and
'oSdo' are shown alternately in the display. 'oSuP' and 'oSdo' represent the values of the
overshoot in % of the total stroke.
5. During the automatic initialization, adjust the booster bypass using the adjustment screw on
the booster. For single-acting actuators, there is one adjustment screw; there are two
adjustment screws for double-acting actuators.
â‘ Booster bypass on single-acting positioner â‘ Booster bypass on single-acting positioner in
flameproof enclosure
If 'oCAY' is shown on the display, the overshoot is less than 3%.
6. Press the or button. The positioner again runs through the initialization step RUN 3,
starting with determination of the travel times. The following figure schematically shows the
RUN 3 sequence for the booster.
7. 'FINISH' is shown on the display when the initialization has been completed.
If the process value on the display does not remain stable or if a constant manipulated variable
cannot be achieved for a constant setpoint, further optimization of the controller data is
necessary. This is described in section Optimization of controller data (Page 101).
See also
Sequence of automatic initialization (Page 109)
Booster
E.3 Booster commissioning
SIPART PS2 with 4 to 20 mA/HART
306 Operating Instructions, 11/2019, A5E00074631-AE
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