view user manual (pdf) - dyna-flo control valves

More documents

Recommendations

Info

Design and Functional Principle 2.3 Method of Operation The electropneumatic positioner SIPART PS2 forms a control circuit with the pneumatic actuator in which the actual value x is the position of the actuator bar in linear actuators or the position of the actuator shaft in rotary actuators and the command variable w is the actuating current of a controller or a manual control station of 4 to 20 mA. The stroke or rotary movement of the actuator is transferred by the appropriate mounting accessories, the feedback shaft and a play--free switchable gearwheel to a high quality conductive plastic potentiometer and to the analog input of the microcontroller. This may correct the angle error of the stroke tap, compares the potemtiometer voltage as actual value x with the setpoint w fed in at the terminals 3 and 7 and calculates the manipulated variable increments Δy. Depending on the size and direction of the control error (x-w) the piezo--controlled supply air or exhaust air valve is opened. The volume of the actuator integrates the positioning increments to actuating pressure y open which moves the actuator bar or actuator shaft approximately proportionally. These positioning increments change the actuating pressure until the control error becomes zero. The pneumatic actuators are available in single and double-acting versions. Only one pressure chamber is aerated or deaerated in the single-acting version. The resulting pressure operates against a spring. In the double-acting version, two pressure chambers are counteractive. In this case the one volume is deaerated when the other volume is aerated. See the block diagram figure 2-9, page 24. The control algorithm is an adaptive predictive five--point switch (see figure 2-8, page 23). The valves are controlled with continuous contact at large control errors (fast step zone). At medium control errors the valve is controlled by pulse length modulated pulses (short step zone). No actuating pulses are output in the small control error zone (adaptive dead zone). The dead zone adaptation and the continuous adaptation of the minimum pulse lengths in automatic operation cause the best possible control accuracy to be achieved at the lowest switching frequency. The start parameters are determined during the initialization phase and stored in a non--volatile memory. These are basically the real travel with the mechanical limit stops, the travel times, the size of the dead zone etc. In addition the number of fault messages, changes in direction and the number of strokes are determined and stored every 15 minutes during operation. These parameters can be read out and documented by the communication programs such as PDM and AMS. Conclusions as to the wear on the fitting can be drawn (diagnostic function) especially by comparing the old value with the currently determined values. Figure 2-9, page 24 shows the block diagrams for single-- and double-- acting actuators with the linear actuator as an example. 22 SIPART PS2 Manual A5E00074631-03
Design and Functional Principle . NOTE The exhaust air valve is always open when there is no current. Figure 2-8 Method of operation five--point switch SIPART PS2 Manual A5E00074631-03 23
Page 1: Manual Edition 07/2003 sipart ps2 E
Page 4 and 5: Copyright e Siemens AG 2000 All rig
Page 6 and 7: 3.4.2 Connection in intrinsically s
Page 8 and 9: Information for the Operator This m
Page 10 and 11: Information for the Operator ! WARN
Page 12 and 13: Information for the Operator The fo
Page 14 and 15: Introduction Degree of protection E
Page 16 and 17: Introduction 1 2 4 3 1 Actuator 2 P
Page 18 and 19: Design and Functional Principle put
Page 20 and 21: Design and Functional Principle 2.2
Page 22 and 23: Design and Functional Principle Pos
Page 26 and 27: Design and Functional Principle 1 B
Page 28 and 29: Design and Functional Principle 5.
Page 30 and 31: Design and Functional Principle 6 1
Page 32 and 33: Design and Functional Principle 1.1
Page 34 and 35: Design and Functional Principle The
Page 36 and 37: Design and Functional Principle 34
Page 38 and 39: Preparing for Operation 90 14 3x G1
Page 40 and 41: Preparing for Operation . NOTE The
Page 42 and 43: Preparing for Operation Assembly of
Page 44 and 45: Preparing for Operation 3.3.3 Mount
Page 46 and 47: Preparing for Operation 2 17 16 12
Page 48 and 49: Preparing for Operation 3.3.6 Assem
Page 50 and 51: Preparing for Operation 15 14 4.2 9
Page 52 and 53: Preparing for Operation fastening B
Page 54 and 55: Preparing for Operation . NOTE Use
Page 56 and 57: Preparing for Operation Current out
Page 58 and 59: Preparing for Operation Non-hazardo
Page 60 and 61: Preparing for Operation Current out
Page 62 and 63: Preparing for Operation Non-hazardo
Page 64 and 65: Preparing for Operation SIA module
Page 66 and 67: Preparing for Operation Only a few
Page 68 and 69: Preparing for Operation 3. Switch o
Page 70 and 71: Preparing for Operation 4. Switch o
Page 72 and 73: Preparing for Operation The first l
Page 74 and 75:
Preparing for Operation The initial
Page 76 and 77:
Preparing for Operation 3.6.7 Autom
Page 78 and 79:
Preparing for Operation 2 set lever
Page 80 and 81:
Preparing for Operation 3.7 Copying
Page 82 and 83:
Operation Figure 4-1 Meaning of the
Page 84 and 85:
Operation 4.3 Operating modes The p
Page 86 and 87:
Operation Manual 4-1 mode In this o
Page 88 and 89:
Operation The following configurati
Page 90 and 91:
Operation . NOTE After ”LWAY, ncS
Page 92 and 93:
Operation y=x 100 % Positioner 1 6.
Page 94 and 95:
Operation The setpoint vertex value
Page 96 and 97:
Operation 40.YCDO 41.YCUP Value for
Page 98 and 99:
Operation 48. TIM 49. LIM 50. STRK
Page 100 and 101:
Operation 4.5 Diagnosis 4.5.1 Diagn
Page 102 and 103:
Operation 4 A1CNT 5 A2CNT Alarm cou
Page 104 and 105:
Operation 31 VENT1 32 VENT2 Number
Page 106 and 107:
Operation Error Event code 1 Remain
Page 108 and 109:
Operation 8 Monitoring of the dead
Page 110 and 111:
Operation Upper line Lower line Mea
Page 112 and 113:
Operation 4.7 Optimization of the c
Page 114 and 115:
Care and Maintenance 8. Replace the
Page 116 and 117:
Technical Data ■ Technical data S
Page 118 and 119:
Technical Data ■ Technical data (
Page 120 and 121:
Technical Data ■ Technical data (
Page 122 and 123:
Scope of delivery 7.1 Ordering data
Page 124 and 125:
Scope of delivery 7.4 Scope of deli
Page 126 and 127:
Index Installation positions, favor
Page 128 and 129:
Appendix 9.2 Certificates 9.2.1 EC
Page 130 and 131:
Appendix 9.2.3 EC Type-Examination
Page 132 and 133:
Appendix 130 SIPART PS2 Manual A5E0
Page 134 and 135:
Page 136 and 137:
Page 138 and 139:
Page 140 and 141:
Page 142 and 143:
Page 144 and 145:
Appendix 9.2.6 FM Approval Report (
Page 146 and 147:
Appendix 9.2.7 FM Approval Report 1
Page 148 and 149:
Appendix 9.2.8 CSA Certificate of C
Page 150 and 151:
Appendix 9.2.9 Control Drawing A5E0
Page 152 and 153:
Page 154 and 155:
Page 156 and 157:
Page 158 and 159:
Page 160:
show all

view user manual (pdf) - dyna-flo control valves

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?