Instruction Manual
D200129X012
2506/2516 Receiver/Controller
June 2017
19
The 2516F receiver/controller also features an anti‐reset windup valve. This valve provides differential pressure relief to
prevent proportional pressure from exceeding reset pressure by more than a set value. The proportional valve output
pressure registers on one side of the diaphragm chamber and the reset valve output pressure registers on the other
side diaphragm. A sudden increase in the output pressure causes a rapid pressure increase in the proportional bellows
and in the proportional side of the diaphragm chamber. If the diaphragm pressure of the relief valve exceeds that of
the spring side by the amount of the relief pressure setting, the relief diaphragm moves off the orifice in the
differential relief valve. This allows the pressure on the proportional side of the diaphragm to bleed into the reset
system. This action provides quick relief of excessive proportional pressure and reduces the time required by the
system to return to the control point. A user can reverse the differential relief action to relieve on decrease output
pressure.
Maintenance
Receiver/controller parts are subject to normal wear and may require inspection or replacement. The frequency of
inspection and parts replacement depends upon the severity of the service conditions. When inspection or repairs are
needed, disassemble only those parts necessary to accomplish the job.
Select the appropriate maintenance procedures and perform the appropriate steps. Each procedure requires that
supply pressure and process pressure be shut off before beginning maintenance.
Establish a maintenance cycle to regularly clean the vents (figure 3). Also, establish a maintenance cycle to clear the
relay orifice (key 88, not shown) by pushing in the plunger of the core assembly (key 89).
WARNING
The following maintenance procedures require taking the controller out of service. To avoid personal injury and property
damage caused by an uncontrolled process:
D Always wear protective clothing, gloves, and eyewear when performing any maintenance operations to avoid personal
injury.
D Provide some temporary means of controlling the process before taking the receiver/controller out of service.
D Release any trapped pressure from the controller and vent supply pressure before disassembly.
D Check with your process or safety engineer for any additional measures that must be taken to protect against process
media.
Changing Controller Action
See figure 14 for key number locations, unless otherwise directed.
Note
Do not switch the 2516 receiver/controller to snap (S) action.
To change controller action, reposition one or both switch plates (key 132), which are mounted on the left or right
bellows assemblies (key 134 or 133 respectively). When either switch plate (key 132) is removed, the raised letters D,
R, S, and P are visible on the bellows frame located under the switch plate (figure 14).
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