Manual Pdf !!top!! | Fisher 3560 Valve Positioner
Use 3/8-inch or 1/4-inch NPT pipe/tubing for connection lines. Connect Supply Air to the port labeled "Supply."
1. No supply pressure.2. Clogged internal nozzle/orifice.3. Defective I/P transducer.
Turn the zero adjustment screw until the valve just begins to move from its seat. Step 2: Span Adjustment
The Fisher 3560 series pneumatic and electro-pneumatic positioners ensure precise control valve stem positioning, often utilized in legacy systems. Key documentation outlines installation requirements such as actuator mounting, and a six-step calibration process to align the mechanical zero and span. For more details, visit Emerson Automation Solutions Fisher Positioner Replacement Overview | PDF - Scribd
The resulting change in nozzle pressure activates the pneumatic relay. The relay then increases or decreases the air pressure sent to the valve actuator. Fisher 3560 Valve Positioner Manual Pdf
Increase the input signal to the maximum (e.g., 15 psig). Adjust the flapper assembly or span adjustment screw until the valve reaches the full intended travel.
Zero and span controls interact. Repeat steps 1 through 4 until no further adjustment is required. Troubleshooting Common Issues Potential Cause Corrective Action Valve hunts or oscillates
Diaphragms, O-rings, flapper/nozzle assemblies, and range springs.
Legacy units often require specific kits to prevent air leaks or sluggish response. Use 3/8-inch or 1/4-inch NPT pipe/tubing for connection
Supply pressure too high; loose feedback linkage; oversized positioner relay.
Connect to the top or bottom casing of the pneumatic actuator. For double-acting actuators, ensure the proper ports are piped to control opposing chambers. 3. Calibration and Adjustment Protocols
Introduce the lower limit of the input signal (e.g., 3 psig).
Align the feedback arm parallel to the actuator stem at mid-travel. Clogged internal nozzle/orifice
Clean the nozzle orifice with a fine wire. Inspect diaphragms for tears. Clogged internal restriction or low supply pressure.
Manufacturers update their technical literature regularly. To ensure you have the correct wiring diagrams, parts lists, and safety warnings, download the official document directly from the source:
The Fisher 3560 series includes pneumatic and electropneumatic positioners designed for use with both diaphragm and piston actuators. Core Models Designed for pneumatic rotary actuators. Fisher 3560 VP: Designed for pneumatic linear actuators.