Siemens SIPART Series - A Appendix; A.1 Operation with boosters

SIPART PS2 with and without HART
Operating Instructions, 10/2013, A5E00074631-11
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Appendix
A
A.1
Operation with boosters
Introduction
In order to shorten the actuating times, it is possible to use a booster between the positioner
and actuator. The booster increases the air performance.
With single-acting positioners you require a booster which must be connected to the air
output Y1. With double-acting positioners you require two boosters which must be connected
to the air output Y1 and to Y2.
NOTICE
Avoid pressure variations
Make sure that the booster does not result in pressure variations in the supply air P
z
on the
positioner.
NOTICE
Note when selecting the boosters:
• Only boosters may be used which do not have a continuous air consumption in the
setpoint input.
• The boosters must not have a follow-up time.
A stable operating state will not be reached if these two points are not observed. All
process components involved are subject to faster wear.
Procedure
1. Reduce the air performance. To do this, use the restrictors on the positioner.
2. Set the deadband "DEBA" to the largest value permissible for your process.
3. Start the initialization process.
4. If necessary, adjust the actuating times during the initialization process.
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 Optimizing the controller data (Page 110).
See also
Sequence of automatic initialization (Page 117)