Samson Series 420 Manual
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Samson Series 420 Manual

Samson Series 420 Manual

Pneumatic control system
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Series 420
Pneumatic Control System
Type 3421 Compact Controller with Type 3422
Controller Station and Type 3423 Controller
Module
Type 3427 Manual Control
Station
Type 3417 Pneumatic
Control Unit
Type 3425 Pneumatic
Controller (control room
installation)
Mounting and
Operating Instructions
EB 7500 EN
Edition July 2017
Type 3416 Indicator
Type 3425 Pneumatic
Controller (field unit)

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Summary of Contents for Samson Series 420

  • Page 1 Series 420 Pneumatic Control System Type 3421 Compact Controller with Type 3422 Type 3417 Pneumatic Type 3416 Indicator Controller Station and Type 3423 Controller Control Unit Module Type 3427 Manual Control Type 3425 Pneumatic Type 3425 Pneumatic Station Controller (control room Controller (field unit) installation) Mounting and Operating Instructions...
  • Page 2 Damage to health relating to the REACH regulation. If a SAMSON device contains a substance which is listed as being a substance of very high concern on the candidate list of the REACH regulation, this circumstance is indicated on the SAMSON delivery note.

  • Page 3: Table Of Contents

    Contents General safety instructions ................5 Application ....................6 Operation .....................6 Settings at the controller modules ..............6 3.1.1 Direction of action ..................6 3.1.2 Air delivery ....................7 3.1.3 Proportional-action coefficient KP ..............8 3.1.4 Reset time Tn ....................8 3.1.5 Derivative-action time Tv .................8 3.1.6 Operating point .....................8 Adjusting the limit contacts ................9 Start-up and settings ...................10...
  • Page 4 Contents Installation ....................24 Changing scales ..................25 Connections ....................26 Pneumatic connections..................26 Electrical connections ...................28 Maintenance ....................30 Checking the air supply ................30 Conversion ....................30 Changing the controller function ..............30 Operating mode changeover in Type 3424-2 i/p Converter ......33 Checking the controller function ..............34 Technical data .....................35 EB 7500 EN...

  • Page 5: General Safety Instructions

    General safety instructions 1 General safety instructions − The device must be mounted, started up, or serviced by fully trained and qualified personnel only; the accepted industry codes and practices are to be observed. Make sure employees or third persons are not exposed to any danger.

  • Page 6: Application

    Application 2 Application 3 Operation The Series 420 Control System is used in au- 3.1 Settings at the controller tomation applications in process engineering modules and industrial plants. It can be used for ap- plications with P, PI, PID, and PD controls, for control loops with control mode changeover NOTICE or signal limitation, for fixed set point, ratio,...

  • Page 7: Air Delivery

    Operation − Turn the board by 90° so that the re- >yA Normal air delivery, quired arrow is aligned with the arrow approx. 1 m ³/h per % of the system de- on the base plate. viation (default setting) − Insert board and tighten the screw. >R High air delivery, approx.

  • Page 8: Proportional-Action Coefficient Kp

    Operation 3.1.4 Reset time Tn 1. Unscrew the fastening screw (6) at the controller module and pull the module off Controller versions with integral-action com- its self-seal push-on fittings. ponent require the reset time to be set at the 2. Unscrew screws (3.3) and pull off the adjuster (10).

  • Page 9: Adjusting The Limit Contacts

    Operation 3.2 Adjusting the limit contacts Indicator with proximity switch Adjustment screw Note The listed limit contacts are no longer avail- able. Inductive contacts in Type 3422 Manual Control Station and Type 3427 Manual Control Unit − Release lock on the front panel and pull out the indicating unit. The proximity switches with min. and max.

  • Page 10: Start-Up And Settings

    Start-up and settings 4 Start-up and settings 2. Set the proportional-action coefficient Kp to a low value (0.2) at the comparator. Before start-up of the control loop, check all PI and PID controllers only: set Tn restric- devices to make sure that they are connected tor to its maximum value (50 min) and Tv correctly, do not leak, and function properly.
  • Page 11 Start-up and settings When the pointers meet, wait until also PI and PID controllers: the automatic output (4) on the bottom Use a stopwatch to time the oscillation scale reaches the manual output (5). time for one entire oscillation to find T crit If necessary, slightly adjust the set point Controlled...

  • Page 12: Bumpless Automatic/Manual Mode Changeover

    Start-up and settings 4.3 Readjusting the controller Note zero point If a P/PI controller is switched to P action, completely open the Tn restrictor to ensure If deviations arise between the controlled the operating point adjuster can take effect variable and set point during operation, the without delay.

  • Page 13: Type 3424-6 Signal Limiter

    Start-up and settings Feedback limitation < > Increasing/decreasing: The additional feedback limitation allows the Position (x-w) </= 0 output pressure yA to be limited. In this case, > > Increasing/increasing: the 0 to 100 % scale of the adjuster corre- Position (x-w) >/= 0 sponds to a limitation signal of 0.2 to 1 bar.

  • Page 14: Design And Principle Of Operation

    Design and principle of operation 5 Design and principle of oper- also function as a control station when no other components are used. ation The controlled variable and set point pointers The pneumatic control system has a modular have metal bellows measuring elements. The design.
  • Page 15 Design and principle of operation Circuit version 1 for fixed set point and slave con- trol P/PI Circuit version 2 for slave control P/PI Circuit version 9 for ratio control Pneumatic connection P/PI Self-seal push-on fitting Supply air Z Venting Pneumatic adjuster End connection Manipulated...

  • Page 16: Type 3427 Manual Control Station

    Design and principle of operation 5.2 Type 3427 Manual Control 5.3 Type 3425 Pneumatic Con- Station troller (wall-mounted and field controller) The Type 3427 Manual Control Station is used in combination with the Type 3425 The pneumatic controllers for control room or Pneumatic Controller (in a Type 3426 Con- field installation consist of the Type 3426 trol Room or Field Housing).

  • Page 17: Type 3416 Indicator

    Design and principle of operation 5.4 Type 3416 Indicator 5.5 Type 3417 Pneumatic Control Unit The pneumatic indicators are used when connected to control equipment to display The Type 3417 Pneumatic Control Unit is measured variables (e.g. temperature or used to adjust, link, and feedback pneumatic pressure) in standardized pneumatic signals signals in standardized range from 0.2 to from 0.2 to 1 bar.

  • Page 18: Type 3423 Controller Modules

    Design and principle of operation 5.6 Type 3423 Controller assumes a value corresponding to the con- trolled variable x and the adjusted propor- Modules tional-action coefficient Kp adjustable over a screw. See u T 7521. The controller modules are plug-in units which are inserted onto the self- Outside of the controller module, the yA is seal push-on fittings of a manual control sta- connected to R, allowing the pressure yA to...
  • Page 19 Design and principle of operation Type 3423-2 PI Controller Module The following controller module versions are almost identical to the Type 3423-2 PI Con- troller Module, except they are fitted with, for example, an operating point adjuster, a de- rivative element or a selector switch, de- pending on the application.
  • Page 20 Design and principle of operation The Type 3423-4 PD Controller Module is similar to Type 3423-4. This module, however, contains a derivative element providing a rate gain of the input branch of the controlled variable x. It has a derivative-action gain of approx. ten times and a derivative-action time that can be ad- justed at the TV restrictor.

  • Page 21: Additional Modules

    Design and principle of operation The ratio V = a/e is adjusted in the same The Type 3424-2 i/p Converter is no longer way as the proportional-action coefficient Kp available. Instead, the external mounting of (gain) for P controllers. a Type 6111, 6116 or 6126 i/p Converter is possible.

  • Page 22: Type 3424-4 For Bumpless Manual/Automatic Switchover

    Design and principle of operation 5.7.2 Type 3424-4 for bump- less manual/automatic switchover A bumpless transfer from manual to auto- matic mode is only possible when the con- troller output pressure yA and the manual Type 3424-5 output pressure yH are the same. The trans- Control Mode Changeover fer from yA to yH is performed manually in...

  • Page 23: Optional Electrical Limit Contacts

    Design and principle of operation 5.8 Optional electrical limit contacts Note The listed limit contacts and LEDs are no lon- ger available. The limit contacts indicate when the con- trolled variable x falls below and/or exceeds an adjustable limit. The version with inductive limit contacts has a controlled variable pointer fitted with metal tags which move adjustable proximity switches within a magnetic field.

  • Page 24: Installation

    Installation 6 Installation The devices are fastened at the top and bot- tom to a rail (Type 3421/3422: 1089-0036 Panel-mounted devices (Type 3421, and Type 3427: 1089-0037) in the control Type 3422, Type 3427, Type 3416, and panel. Type 3417) The tightening torque for the screws depends All devices have the front dimensions on the installation situation (approx.

  • Page 25: Changing Scales

    Installation Type 3426 Control Room or Field Housing Type 3423 Controller Modules and Type 3424 Additional Modules Fasten control room housing (Type 3426-2) using M4 screws in the control room. Push the controller and additional modules Fasten the field housing (Type 3426-3) using into the self-seal push-on fittings and screw brackets to a wall. them tight. Cover open View A 8 ...

  • Page 26: Connections

    Connections 7 Connections yA Automatic output pressure (0.2 to 1 bar) Sealed in Type 3422, open for separate 7.1 Pneumatic connections instrumentation with Type 3427 Pneu- matic Manual Control Unit The pneumatic connections are designed as a bore with NPT thread. Customary fit- Output in Types 3423 and 3425, input 8 ...
  • Page 27 Connections Manipulated variable (0.2 to 1 bar) Zul Supply air Controller output signal to actuate the Ports 1, 2, 3, 4 control valve In Type 3416 Indicator and Type 3417 Pneu- Output in Type 3427, input in matic Control Unit. Assignment depending Types 3423 and 3425. on version. Type 3416-90/91 Indicators with pneumatic limit contacts have ports designed as con- necting grommets for a 1.8x1 hose.

  • Page 28: Electrical Connections

    Connections 7.2 Electrical connections In Germany, these are the VDE regulations and the accident prevention regulations of the employers’ liability insurance. NOTICE For electrical installation, observe the rele- Note vant electrotechnical regulations and the ac- The listed limit contacts, LEDs, and i/p con- cident prevention regulations that apply in verters are no longer available.
  • Page 29 Connections Electrical connection only applies to devices operation of the inductive limit contacts re- with additional i/p modules or electrical quires switching amplifiers in accordance equipment, such as limit contacts or LEDs. with EN 60947-5-6 to be connected in the Fast-on connectors (6.3 mm socket) or termi- output circuit.

  • Page 30: Maintenance

    Maintenance 8 Maintenance 9 Conversion 8.1 Checking the air supply 9.1 Changing the controller function The modules of the pneumatic controllers normally do not require any maintenance. If a different control behavior is necessary, However, the air supply must be checked at for example, after modifying the plant, the regular intervals.
  • Page 31 Conversion ative amplifier (14) in place. Unscrew (15) in place of the adjuster for operat- cover plate (11.1) and mount Tv restrictor ing point (12). (11). Note PI to PID: Same as for P to PD. We recommend replacing old O-rings with P to PID: Same as for P to PD.
  • Page 32 Conversion Table 1: Spare parts Part Qty. Designation Order no. Restriction with filter 1390-0183 Filter in the connecting plate of the manual control unit 0550-0189 Tn restrictor 1070-4584 10.1 M3 x 6 screws 8333-0476 10.2 O-rings 1.78 x 1.02 8421-0010 Tv restrictor 1070-4585 11.1 Cover plate 0360-1597 11.2 M3 x 8 screws...

  • Page 33: Operating Mode Changeover In Type 3424-2 I/P Converter

    Conversion 9.2 Operating mode change- 8. Reinstall converter and plug on the cable connector. over in Type 3424-2 i/p Converter The i/p module is in the x input in x mode and in the w input in w mode. 1. Release lock and completely pull out the plug-in unit.

  • Page 34: Checking The Controller Function

    Conversion 9.3 Checking the controller function To check the controller, the controlled vari- able x and the output y must be bypassed at ports x and y on the controller station. Perform the following settings: − Turnboard A to increasing/decreasing > <, −...

  • Page 35: Technical Data

    Technical data 10 Technical data Type 3421 Compact Controller Type 3422 Manual Control Station Circuit 1 and 2 Set point/ Measuring range 0.2 to 1.0 bar (3 to 15 psi) · Accuracy class 1 (synchronism 0.6) · Scale 0 to controlled 100 %, (linear, square root or special inscription) · Scale length 100 mm variable display Output 0 to 1.2 bar (0 to 18 psi) · Accuracy class 2.5 × Scale: 0 to 1.2 bar (0 to 18 psi), length Output display...
  • Page 36 Technical data Type 3424-2 ... i/p converter, 4 to 20 mA or 0 to 20 mA input, 0.2 to 1 bar (3 to 15 psi) output Additional Module Input impedance approx. 200 Ω and 4 mH Manual/automatic transfer Type 3424-4 Input: 0.2 to 1.0 bar (3 to 15 psi) Output: 0.2 to 1.0 bar (3 to 15 psi), max.
  • Page 37 EB 7500 EN...
  • Page 38 EB 7500 EN...
  • Page 39 EB 7500 EN...
  • Page 40 SAMSON AG · MESS- UND REGELTECHNIK Weismüllerstraße 3 · 60314 Frankfurt am Main, Germany Phone: +49 69 4009-0 · Fax: +49 69 4009-1507 EB 7500 EN samson@samson.de · www.samson.de...

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