GE Masoneilan 4700P Maintenance Manual

Also see for Masoneilan 4700E: Instruction manual

Contents

Masoneilan 4700P/E & 4800P/E Positioners Manual =| 57© 2015 General Electric Company. All rights reserved.Positioner Action Change (4700P/4800P Only)Whenever it becomes necessary to change positioner action from direct to reverse or vice versa,it is important to be familiar with the following steps.To remove or install the cam safely, the valve position must correspond to the low signal line onlobe.The positioner supply line, the vent and the lever S/A must be reversed.From Air to Open / Direct to Air to Open/Reverse1. Perform Steps 1 and 2 from “Cam Lobe Change” on page 49 for Air to Open/DirectActing Positioner. Cam is now removed.2. Proceed to Field Mounting and Calibration section for Air to Open/Reverse ActingPositioner and proceed as stated.From Air to Open / Reverse to Air to Open/Direct1. Perform Steps 1, 2 and 3 from “Cam Lobe Change” on page 49 for Air to Open/Reverse Positioner. Cam is now removed.2. Slowly reduce pressure applied to actuator to zero. (If handwheel was used toplace valve in open position back it off completely.) Valve is now closed. Removeindependent regulated air line from actuator.3. Proceed to Field Mounting and Calibration section for Air to Open/Direct ActingPositioner and proceed as stated.From Air to Close / Direct to Air to Close/Reverse1. Perform Steps 1 and 2 from “Cam Lobe Change” on page 49 for Air to Close/DirectActing Positioner. Cam is now removed.2. Proceed to Field Mounting and Calibration section for Air to Close/Reverse ActingPositioner and proceed as stated.From Air to Close / Reverse to Air to Close/Direct1. Perform Steps 1, 2 and 3 from “Cam Lobe Change” on page 49 for Air to Close/Reverse Acting Positioner. Cam is now removed.2. Slowly reduce pressure applied to actuator to zero. (If handwheel was used toplace valve in closed position back it off completely.) Valve is now open. Removeindependent regulated air line from actuator.3. Proceed to Field Mounting and Calibration section for Air to Close/Direct ActingPositioner and proceed as stated.