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3610J and 3620J Positioners
and the spring seat (key 126, figure 25). Then install
the counter spring and replace the spring seat and
machine screw.
4. If using characterized cam B or C, refer to the
Changing Cams procedures.
5. Perform the Zero and Span adjustment
procedure.
6. Replace the cover.
Changing to Reverse Action
CAUTION
Do not use bypass when the valve
positioner is reverse-acting. In this
case, bypassing the valve positioner
sends the input signal directly to the
actuator. Such a change will affect the
desired operation and possibly upset
the system. Use bypass only when the
input signal range is the same as the
valve positioner range required for
normal actuator operation.
1. Unscrew the four captive cover screws, and
remove the cover (key 41, figure 28).
2. Loosen the reversing plate screw (key 49,
figure 25), and adjust the reversing plate (key 23,
figure 13) to expose the letter R and cover the
letter D.
3. For 3610J and 3620J positioners set up for 60
degree valve rotation, or 3611JP and 3621JP
positioners set up for 11 mm (7/16-inch) actuator
travel or less, a change to reverse action also
requires that the counter spring (key 125, figure 25)
be removed and discarded. To remove the
counterspring, remove the machine screw (key 127,
figure 25), the spring seat (key 126, figure 25), and
the counter spring (key 125, figure 25). Then replace
the spring seat and machine screw.
4. If using characterized cam B or C, refer to the
Changing Cams procedures.
5. Perform the Zero and Span adjustment
procedure.
24
6. Replace the cover.
Split-Range Operation
CAUTION
Do not use bypass when the valve
positioner is in split-range operation.
In this case, bypassing the valve
positioner sends the input signal
directly to the actuator. Such a change
will affect the desired operation and
possibly upset the system. Use bypass
only when the input signal range is the
same as the valve positioner range
required for normal actuator operation.
Split-range operation is possible with 3610J and
3620J Series positioners. With split-range operation,
the input signal from a single control device is split
between two or three control valves. The positioners
will fully stroke the actuator with an input signal span
of 0.2 bar (3.2 psig) minimum to 2.0 bar (28.8 psig).
The zero adjustment of the positioner is continuously
adjustable between 0.07 to 1.5 bar (1 and 22 psig).
Table 12 shows some typical split ranges for the
positioners. Refer to tables 8 through 11 and figure
15 for the correct range spring and range spring hole
selection for the desired coarse span adjustment.
Contact your Emerson Process Management sales
office, or the factory for input signal ranges not
shown in table 12.
The following is an example of range
spring and range spring hole selection
in tables 8 through 11. Assume a 0.2 to
0.6 bar (3 to 9 psig) input. This is
equivalent to a span of 0.4 bar (6 psi)
[0.6 bar − 0.2 bar = 0.4 bar (9 psig − 3
psig = 6 psi)]. Therefore for a 90
degree valve rotation and a span of 0.4
bar (6 psi), select a blue range spring.
Place the range spring in hole number
2 on the summing beam assembly.
Instruction Manual
June 2008
Note
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