Samson 3767, Mounting And Operating Instructions

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Contents
EB 8355-2 EN 3
1 General safety instructions .............................................................................5
2 Design and principle of operation .................................................................. 6
2.1 Versions and article code ................................................................................9
2.2 Technical data .............................................................................................10
2.3 Additional equipment ...................................................................................11
2.4 Summary of explosion protection approvals ...................................................12
3 Mounting on control valves ..........................................................................14
3.1 Direct attachment to Type 3277 Actuator .......................................................14
3.2 Attachment according to IEC 60534-6 ...........................................................21
3.2.1 Mounting sequence ......................................................................................22
3.2.2 Initial adjustment of travel .............................................................................22
3.3 Attachment to rotary actuators ...................................................................... 25
3.3.1 Mounting the lever with feeler roll .................................................................. 26
3.3.2 Mounting the intermediate piece ................................................................... 26
3.3.3 Basic setting of the cam disk .........................................................................28
3.3.4 Reversing amplifier for double-acting actuators ..............................................32
4 Connections ................................................................................................34
4.1 Pneumatic connections..................................................................................34
4.1.1 Pressure gauges ...........................................................................................34
4.1.2 Supply pressure ...........................................................................................34
4.2 Electrical connections ................................................................................... 36
4.2.1 Switching amplifier ...................................................................................... 37
5 Operation ...................................................................................................38
5.1 Tuning the positioner mounted onto the control valve .......................................38
5.1.1 Adjusting the proportional band Xp and air delivery Q ..................................39
5.1.2 Settings for actuator with “actuator stem extends” fail-safe action .....................40
5.1.3 Settings for actuator with “actuator stem retracts” fail-safe action .....................40
5.2 Changing the operating direction ..................................................................41
5.3 Adjusting the limit contacts ...........................................................................42
5.4 Adjusting the position transmitter ...................................................................44