SIEMENS SIPART PS2 POSITIONER MANUAL PDF

The electropneumatic positioner moves the actuator to a valve position corresponding to the setpoint. Additional function inputs can be used to block the valve or to set a safety position. A binary input is present as standard in the basic device for this purpose. The valve manifold is located in the housing, the pneumatic connections for the inlet air and the positioning pressure on the right-hand side. The circuit board container in the casing provides slots for separately ordered boards with the following functions: 7 Iy module: - Position feedback as a two-wire signal 4 to 20 mA.

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The electropneumatic positioner moves the actuator to a valve position corresponding to the setpoint. Additional function inputs can be used to block the valve or to set a safety position. A binary input is present as standard in the basic device for this purpose. The valve manifold is located in the housing, the pneumatic connections for the inlet air and the positioning pressure on the right-hand side. The circuit board container in the casing provides slots for separately ordered boards with the following functions: 7 Iy module: - Position feedback as a two-wire signal 4 to 20 mA.

The two limits can be set independently as maximum or minimum values. The outputs indicate self-signalling faults. The device functions are the same as with the basic device. The module additionally contains an alarm output see alarm module.

Separate connection of actuator travel detection system and controller unit The actuator travel detection system and controller unit can be connected separately for all casing versions of the SIPART PS2.

Measurement of the travel or angle is carried out as usual directly on the actuator by means of the corresponding attachment set and e. The controller unit can then be fitted a certain distance away, e. Such a split design is frequently advantageous if the ambient conditions at the fitting exceed the specified values for the positioner, e. Extremely high vibrations? Nuclear e. The use of linear potentiometers 10 k? Non-contacting position sensor NCS The actuator travel detection unit can also consist of a non-contacting position sensor instead of a potentiometer.

All coupling elements are omitted such as coupling wheel and driver pin with part-turn actuators or lever and pick-up bracket with linear actuators. This results in:? Even greater resistance to vibration and shock? No wear of sensor? Problem-free mounting on very small actuators? No hysteresis with very small travels. The sensor does not require an additional power supply, i. The NCS Non-Contacting Position Sensor consists of a potted sensor housing which must be mounted permanently and a magnet which is mounted on the spindle of linear actuators or on the shaft butt of part-turn actuators.

Comparison of the setpoint and the actual value takes place electronically in a microcontroller. If the microcontroller detects a deviation, it uses a 5-way switch procedure to control the piezoelectric valves, which in turn regulate the flow of air into the actuating chambers.

The way the SIPART PS2 works, together with its integrated additional functions, offer the user considerable benefits in the installation and operation of the positioner:? Simple installation and largely automatic commissioning means time savings and guarantees reliable operation? An on-line adaptation procedure means very high-quality control even under unfavorable operating conditions?

Maintenance-free operation? The valve position can be adjusted manually with the help of a display and keyboard. A separate current source is not required? The firmware contained in the SIPART PS2 positioner provides a number of functions that can be activated simply by configuring the positioner accordingly, e. The "tight shut-off" function ensures maximum positioning pressure on the valve seat? Compressed air consumption when operating the positioner is negligible compared to a traditional positioner.

The linear or rotary motion of the actuator is detected by the mounting assembly and transferred via a rigid connection to a potentiometer made of a wear-resistant plastic conductive material. The angular error of the pick-up in cases where the assembly is mounted on a linear actuator is corrected automatically.

The microprocessor then outputs an electric control command to the piezoelectric valve in accordance with the magnitude and direction of the deviation deviation between setpoint w and control output x. The piezoelectric valve converts the command into a pneumatic positional increment. The positioner outputs a continuous signal in the area where there is a large control deviation high-speed zone ; in areas of moderate control deviation slow-speed zone it outputs a sequence of pulses.

No positioning signals are output in the case of a small control deviation adaptive or variable dead zone. Pneumatic valve manifold with piezoelectric valve precontrol The valve manifold is characterized by an extremely long service life.

The pilot element is a piezoelectric bending converter which switches the pneumatic main control unit. The piezoelectric valve can release very short control pulses because of its low mass. A high positioning accuracy can then be achieved. It is then permissible to use all option modules. The positioner can also be configured using this program. Parameters which provide important information for maintenance and fault diagnosis of the complete unit can additionally be determined using process data and comparison data.

The signals required for communication according to the HART protocol are superimposed on the current signal according to frequency shift keying. Commissioning Commissioning initialization is carried out automatically to a large extent. During initialization, the microcontroller automatically determines the zero, full-scale value, direction of action and positioning speed of the actuator.

It uses these to determine the minimum pulse time and the dead zone, thus optimizing the control. This information may be important for diagnosis of the actuator or valve. The measured values some of whose limits can be adjusted to be determined and monitored include:? Travel integral? Number of changes in direction? Alarm counter? Self-adjusting dead zone? Valve limit position e. Operating hours also according to temperature classes as well as min.

Operating cycles of piezoelectric valves? Valve positioning time? Actuator leakages. Devices of types 6DR Devices of type 6DR Input current range 0 to 20 mA or 4 to 20 mA? Rising or falling characteristic at the setpoint input? Positioning speed limit setpoint ramp?

Split-range operation; adjustable start-of-scale and full-scale values? Response threshold dead zone ; self-adjusting or fixed? Direction of action; rising or falling output pressure with rising setpoint? Limits start-of-scale and full-scale values of positioning range? Limits alarms of the final control element position; minimum and maximum values? Automatic "tight shut-off" with adjustable response threshold for 6DR The travel can be corrected in accordance with the valve characteristic.

The following can be selected: - Linear characteristic - Equal-percentage characteristic 1: 25, 1: 33 and 1: 50 - Inverse equal-percentage characteristic 1: 25, 1: 33 and 1: 50 - Any characteristic, to be entered as a polygon with 21 interpolation points.

Function of binary inputs? Function of alarm output. YCDO YCUP YAGL 1 Degrees 3. BIN2 4 5. SCUR 7. SDIR 8. SPRA 9. SPRE TSUP TSDO A1 A2 SL0 SL19 SL20 3 DEBA Controller dead zone YA YE YNRM 3 YDIR

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PS2 electropneumatic positioner is number 1 in its field by a very wide margin. Our past experience gathered from 15 years in the field speaks for itself and means reliability for your future applications as well. On the contrary: innovation, and lots of it, is the buzzword. A single model, for instance, works for both linear and rotary actuators. It can be operated for Windows-based HMI with the simplest PC software, and it can be used with even the smallest actuators because the fully-integrated valve block makes the SIPART PS2 a lot more compact and it comprehends external position signals also. SIPART PS2 has a user-friendly digital display, shows operating states clearly and can be operated directly at the machine without the need for additional equipment.

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