Samson 4785 Mounting And Operating Instructions Download Page 1

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PROFIBUS Positioner

Type 3785

PA device profile version 3.0

Fig. 1

⋅

Type 3785

Mounting and

operating instructions

EB 8382-2 EN

Firmware R 1.42/K 2.11
Edition January 2003

Summary of Contents for 4785

Page 1: ...PROFIBUS Positioner Type 3785 PA device profile version 3 0 Fig 1 Type 3785 Mounting and operating instructions EB 8382 2 EN Firmware R 1 42 K 2 11 Edition January 2003...

Page 2: ...the cam follower roll lever 20 2 3 2 Mounting the intermediate piece 20 2 3 3 Aligning and mounting the cam disk 22 2 3 4 Reversing amplifier for double acting actuators 24 2 4 Fail safe position of...

Page 3: ...Device Database Files GSD 38 7 2 Data exchange 38 7 3 Parameter description 42 7 4 Status code of the measured variable 44 7 5 Operating modes 46 7 5 1 Start up warm start 47 7 5 2 Monitoring functio...

Page 4: ...ructions or who are authorized to work on explosion proof devices in hazardous areas also see section 6 Any hazards which could be caused in the control valve by the process me dium the operating pres...

Page 5: ...e Mounting position Arrow towards actuator Arrow away from actuator Transmission code D1 Pin position A Rated travel 15 mm 15 mm Final position for w 1 1 Final position for w 125 125 Lower travel rang...

Page 6: ...ion of bit 13 remains unchanged Messages are only issued by bit 7 if control firmware version R 1 41 or higher is used The message Warm start indicated by bit 11 of the DIAGNOSIS parameter is automati...

Page 7: ...r self resetting control loop error transit time exceeded is detected or when the limit value for the total valve travel is exceeded the status of the parameters READBACK or POS_D is set to GOOD_MAINT...

Page 8: ...lt 0 5 Resolution 0 05 internal measurement Transit time Up to 240 sec separately adjustable for exhaust and supply air Operating direction Reversible adjustable using software Air consumption Indepen...

Page 9: ...m chromated and plastic coated External parts Stainless steel 1 4571 and 1 4301 Weight Approx 1 3 kg For the intrinsically safe version 3785 1 the data given in the type examination certif icate apply...

Page 10: ...y can generate single pulses of variable width Controlling the two valves causes the actua tor of the control valve to move the plug stem to a position corresponding to the ref erence variable If ther...

Page 11: ...positioner is configured and operated from the PC via the SSP interface 13 using TROVIS VIEW Alternatively a segment coupler can be used together with for example the COMMUWIN II interface by Endress...

Page 12: ...the required mounting parts refer to Tables 1 2 and 3 on page 15 When looking onto the signal pressure con nection or the switchover plate 120 cm2 ac tuator from the top the positioner is to be attac...

Page 13: ...g 1 2 Clamp D1 Lever D2 Lever 15 Distance plate 16 Cover Signal pressure bore Side view of connection block with switch plate Connection block Marking Marking Symbol Actuator stem extends Actuator ste...

Page 14: ...ositioner so that the bore in the distance plate 15 is aligned with the seal located in the bore of the actua tor yoke 8 Align the switchover plate with the corresponding symbol for attachment on the...

Page 15: ...ed with new switchover and connecting plates Old and new plates are not interchangeable Connection block required for actuator sizes 240 350 and 700 cm including seals and fastening screw G thread 140...

Page 16: ...so that the valve is set to 50 of its travel This will ensure the exact alignment of the lever 18 and the bracket 28 Control valve with casted yoke 1 Use countersunk screw to attach the plate 20 to t...

Page 17: ...29 30 Attachment to NAMUR rib Mounting position Attachment to rods 18 Levers N1 N2 19 Pin 20 Plate 21 Clamp 22 Clamping plate 23 Screw 24 Pointer 25 Shaft 26 Lever of positioner 27a Transmisison pin 2...

Page 18: ...nut on the op posite side Note the mounting position A or B respectively according to Table 5 and Fig 5 4 Put the positioner to the adapter hous ing such that the pin 27 lies properly within the arms...

Page 19: ...no Pressure gauge mounting block G 1 4 NPT 1 4 1400 7106 1400 7107 Pressure gauge set SS Brass SS SS 1400 6957 1400 6958 Signal pressure throttles screw in type and brass throttle 1400 6964 Filter ch...

Page 20: ...e positioner is attached to actuators by other manufacturers NAMUR the air is ap plied to the chamber behind the diaphragm through a tube assembly with tee con nected between actuator and intermediate...

Page 21: ...UR Attachment to SAMSON Type 3278 33 Positioner 34 Intermediate piece 35 Lever with cam follower roll 36 Adapter 37 Transmission lever 38 Screws 39 Scale 40 Cam disk 41 Actuator shaft 42 Plate 43 Brac...

Page 22: ...e closing position must not be below the 0 position In actuators with fail safe position Control valve open OPEN the actuator must therefore be loaded with the max signal pressure prior to aligning th...

Page 23: ...d 1079 1118 NPT 1079 1119 Cam disk with accessories angle of rotation 0 to 90 and 0 to 120 1400 6959 Pressure gauge mounting block G 1 4 1400 7106 NPT 1 4 1400 7107 Pressure gauge set St steel Brass 1...

Page 24: ...d special screws 1 1 into the connecting boreholes A1 and Z 4 Place the reversing amplifier onto the positioner and screw tight using both special screws 1 1 5 Replace the venting plug in the revers i...

Page 25: ...Z A2 1 4 A1 A2 Z A1 Output 38 Supply 9 Output 38 Supply 9 1 Reversing amplifier 1 1 Special screws 1 2 Gasket 1 3 Special nuts 1 4 Rubber seal 1 5 Plug From the positioner Control signals to the actua...

Page 26: ...stem retracts or stem extends Exhaust air The exhaust air connection of the positioner is located on the mounting kit For direct attachment of the positioner a vent plug is located at the plastic cov...

Page 27: ...nt prevention regulations that apply in the country of use In Germany these are the VDE regu lations and the accident prevention regulations of the employers lia bility insurance The following regulat...

Page 28: ...able gland standard of the positioner to the terminals The shield which is placed over the clamping insert is connected over a large area to the gland and housing 1 To connect the bus line loosen the...

Page 29: ...ers with forced venting function a voltage of 6 to 24 V DC must be applied to the relevant terminals The forced venting function can be acti vated or deactivated over an internal switch See section 4...

Page 30: ...set up with one switch directly as per numbers 1 2 4 etc or by adding up several switch po sitions The positioner is delivered with the address set to 126 default Note A new bus address is not accept...

Page 31: ...PROFIBUS DP E RS 485 PROFIBUS DP RS 485 Controller PLC Control system Segment coupler Display and control element Controller PLC Control system Display and control element Ex proof segment coupler Non...

Page 32: ...reen Error recognized control operation possible For details refer to the table below Description LED Device start up Red lights up No error Device on the bus cold start executed initialization requir...

Page 33: ...nction activated 2 DISABLED Function deactivated 4 4 Default settings All variables are set to their default values Initialization applying the maximum range allows for a universal start up Note Manua...

Page 34: ...hat time the valve changes its position There fore never initialize the positioner during a running process but only during the start up cycle when the shut off valves in the plant are closed or when...

Page 35: ...zero calibration After this a new initialization routine can only be started when the communication is connected A completed initialization can be canceled via the communication with the command Rese...

Page 36: ...s entered the field must be selected at the switching amplifier if required Adjusting the switching point The limit switches are marked GW1 and GW2 on the inside of the case cover Yel low tags and the...

Page 37: ...r on which the ex plosion protection is based must be ser viced the positioner must not be put back into operation until an expert has inspected the device according to explosion protec tion requireme...

Page 38: ...unit in this case the Type 3785 Positioner 7 2 Data exchange According to the PROFIBUS PA device profile for electropneumatic actuators a total of 7 dif ferent cyclic parameter combinations is availab...

Page 39: ...action Octet 3 Fraction Octet 4 Fraction Octet 5 Octet 1 Octet 2 READBACK Value Floating Point IEEE Status POS_D Value POS_D Status Output value Output Byte 0 1 2 3 4 Octet 1 Sign Exponent Octet 2 Exp...

Page 40: ...loating Point IEEE Status POS_D Value POS_D Status CHECK_ BACK 0 CHECK_ BACK 1 CHECK_ BACK 2 Output value Output Byte 0 1 2 3 4 Octet 1 Sign Exponent Octet 2 Exponent Fraction Octet 3 Fraction Octet 4...

Page 41: ...ent Fraction Octet 3 Fraction Octet 4 Fraction Octet 5 READBACK Value Floating Point IEEE Status RCAS_OUT Value Floating Point IEEE Status Byte 10 11 12 13 14 Octet 1 Octet 2 Octet 1 Octet 2 Octet 3 P...

Page 42: ...the actuator Note The RCAS operating mode is implemented in version K1 60 and higher READBACK Current position with status Controlled variable x The position feedback is transmitted via the READBACK...

Page 43: ...sitioner can provide other messages as Ext_Diag_Data These are also bit wise encoded and correspond to the PROFIBUS PA profile parameter Diagnosis Bit no Name Description 0 DIA_HW_ELECTR Hardware erro...

Page 44: ...ation no usable value Internal communication error no last usable value available 24 out of Service Transducer block in operating mode OUT OF SERVICE e g device not initialized 28 Limit bits The two l...

Page 45: ...maintenance required Transit time monitoring active or zero point error active or total valve travel exceeded 164 Good Cascade Substatus Condition Value Good_CAS_Init_Acknowledge This status is requi...

Page 46: ...aracteristic deactivated this value corresponds to the actual valve position in mm or degrees The parameter INCREASE_CLOSE operating direction however is not processed Com munication monitoring parame...

Page 47: ...fail safe position As soon as a valid set point SP is transmitted to the positioner the operating mode changes to automatic If the status of the transmitted set point is bad or the positioner has not...

Page 48: ...elapsed unless the status of the reference variable RCAS_IN is good cas cade Once the positioner has switched to automatic mode the rules stated under Auto mode apply i e fail safe action is activated...

Page 49: ...n stem extends Speed limit Transit time Final positions function End pos at End pos at Correction value Operating direction stem retracts Travel range relation Start End Reference variable range Initi...

Page 50: ...cturer VALVE_MAN Actuator manufacturer ACTUATOR_MAN Type number positioner DEVICE_ID Serial number positioner DEVICE_SER_NUM Serial number of associated actuator ACTUATOR_SER_NUM Serial number of asso...

Page 51: ...ation command SELF_CALIB_CMD Calibration status SLF_CALIB_STATUS Transmission code TRANSM_CODE M Transmission length TRANSM_LENGTH M Transmission pin position TRANSM_PIN_POS M Initialization method IN...

Page 52: ...r parameters Proportional action coefficient KP_Y1 SERVO_GAIN_1 Proportional action coefficient KP_Y2 SERVO_GAIN_2 Derivative action coefficient KD SERVO_RATE_1 Dead band Xtot DEADBAND Proportional ac...

Page 53: ...ce status CHECK_BACK Total valve travel TOTAL_VALVE_TRAVEL Total valve travel limit value TOT_VALVE_TRAV_LIM Delay time DELAY_TIME M Tolerance band TOLERANCE_BAND M Calibration alarm message SELF_CALI...

Page 54: ...number ADD_GEAR_SER_NUM Serial number of the additional component Assignment AO Transducer Block OUT_CHANNEL Assignment between the output of the analog output block and the input of the transducer bl...

Page 55: ...Air leakage in pneumatic system during initialization 254 Successful 255 No valid data at the application 0 Calibration command SELF_CALIB_CMD States Command to start manufacturer specific calibratio...

Page 56: ...position with status Controlled variable x in unit PV_SCALE Controlled variable transducer block FEEDBACK_VALUE Indicates current valve position in unit OUT_SCALE Correction value OUT Correction value...

Page 57: ...reset when they are read R Static mess they are retained as long as the event is present in the field device 0 No message 1 Status message active Diagnosis DIAGNOSIS Message type States Detailed devic...

Page 58: ...olute final positions Restrictions specified in the functions travel range or travel limit do not apply here This function must be deactivated if unacceptably high positioning forces result from the c...

Page 59: ...ion zero initialization button In case of communication failure of more than 30 sec local operation is enabled 0 Disabled 1 Enabled 1 Message DEVICE_MESSAGE Available space to enter text in the field...

Page 60: ...sition in mm or degrees The parameter INCREASE_CLOSE operating direction however is not processed Communication monitoring parameters FSAFE_TIME _TYPE _VALUE are also not processed Out of service OS F...

Page 61: ...ault Proportional action coefficient for supply air When writing the value is written to KP_1 supply air and KP_Y2 exhaust air Proportional action coefficient for exhaust air When writing the value is...

Page 62: ...r Uniquely identifies the field device in combination with the manufacturer s name and device type number Serial no valve VALVE_SER_NUM Serial number of the positioner s corresponding valve Length 16...

Page 63: ...exceeds the overshoot the pulse adaptation reduces the minimum pulses in the operating direction which has caused the overshoot If the set point deviation e exceeds the dead band Xtot but remains with...

Page 64: ...e in direction of the100 position Range 0 to 240 sec 0 sec Transmission code TRANSM_CODE M States States Default For linear actuator with integrally attached positioner Determination of the geometrica...

Page 65: ...ICATION Describes the device s type of protection Valve manufacturer VALVE_MAN Clearly identifies the manufacturer of the valve Length 16 characters Valve position feedback discrete POS_D States Discr...

Page 66: ...CHKSUM Memory checksum error Set when the cyclic check detects that a memory cell has been modified without verification Static message remains valid while the error is detected in the field device R...

Page 67: ...ightly lower than the one determined for a reference valve the positioner automatically signals that the valve needs to be maintained to avoid a possible failure Reset is triggered by command SELF_CAL...

Page 68: ..._TRAV_TIME Status of travel monitoring Set when permissible transit time was exceeded A 10 CB_UPDATE_EVT Change of static data Set when device data are changed Enables monitoring of unintentional unau...

Page 69: ...valve travel exceeded The current value for the total valve travel exceeds the entered or preset limit value If this limit value is preset to a value slightly lower than the one determined for a refe...

Page 70: ...r housing Connecting cable between logic and displacement sensor board disconnected Timeout The initialization routine cannot move the valve to the final position within 240 seconds Initialization is...

Page 71: ...d through activation of forced venting function If the implemented forced venting option is activated the initialization process is abort ed For the implemented forced venting option a voltage between...

Page 72: ...t 1 A1 Output 2 A2 Supply Z Output 38 Supply 9 M20 x1 5 Fulcrum of the driving shaft old PG 13 5 Pneumatic connection reversing amplifier Pneumatic connections G 1 4 or NPT 1 4 Direct attachment Attac...

Page 73: ...EB 8382 2 EN 73...

Page 74: ...74 EB 8382 2 EN...

Page 75: ...EB 8382 2 EN 75...

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Page 77: ...EB 8382 2 EN 77...

Page 78: ...SAMSON AG MESS UND REGELTECHNIK Weism llerstra e 3 60314 Frankfurt am Main Germany Phone 49 69 4009 0 Fax 49 69 4009 1507 Internet http www samson de S Z 2003 03 Model 3785 xxx1 EB 8382 2 EN...

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