Logix 3800-Replacing the Electronics and Piezo Assembly скачать в хорошем качестве

Logix 3800-Replacing the Electronics and Piezo Assembly

The purpose of this video is to demonstrate the removal and installation of the elextronics and piezo of the Logix 3800 positioner. Please refer to Appendix G of the IOM for the correct P/N needed for your specific positioner model. Step #1 : Make sure the valve is bypassed or in a safe condition. Disconnect power to the positioner. Disconnect air supply to the positioner. Remove the take of arm and follower arm.  NOTE: It is recommended that the positioner be removed from the valve and taken to a clean work environment for disassembly and reassembly if possible. Note: the procedure is the same for both intrinsically safe (IS) and explosion proof (EX) positioners. Step 2 :  Begin by removing the positioner main cover. Remove the inner cover by removing the two PCB cover retaining screws.  Unscrew the five electronics module retaining screws.  Gently remove the electronics by holding the terminal block and lifting the electronics from the housing. Caution: Standard Electro-Static Discharge best practices are required to prevent potential damage to the electronics. If you are replacing the piezo, remove it from the electronics and install the replacement.   Step 3: Installation:  Verify that the 4 pressure sensor O-rings are in the electronics assembly.  Verify that the two piezo O-rings are placed in the Housing.  Verify that the piezo is plugged into the bottom of the electronics assembly.   Place the electronics assembly into the housing, aligning the pressure sensor O-rings with the four holes in the housing.  Step #4 Tighten the 5 electronics assembly screws down, in a star-shaped pattern, to verify even pressure for sealing the O-rings.  Torque screws to 0.9 N-m or 8 in-lbs.  Place inner cover over electronics assembly and tighten screws in a back and forth pattern to verify even pressure.  Torque screws to 0.9 N-m or 8 in-lbs.  End Step #1 : Reconnect the positioner, follower arm, and the take-off arm to the valve. Step#2: Next, Perform a Quick-Cal