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3610J and 3620J Positioners
Minor Loop Gain Adjustment
The minor loop gain adjustment varies the dynamic
gain of the positioner to match the specific size and
characteristic of the actuator. This adjustment allows
tuning of the positioner transient response to the
application without significantly affecting the static
operating performance.
The minor loop gain adjustment is factory set for a
positioner shipped with the actuator. However,
additional adjustment should be made to suit the
particular application requirement. The minor loop
gain also may require adjustment if:
D the positioner was not installed on the actuator by
the factory,
D installing the positioner on an actuator other than
the type for which the positioner was originally set up,
D maintenance was performed on the positioner.
The minor loop gain should be adjusted before
performing the other calibration procedures.
Figure 13 shows the minor loop gain adjustment
location. As shown in figure 14, the adjustment is
made by moving the flexure adjustment (key 156)
along the top flexure.
The table in figure 14 and a label inside the
positioner cover (key 41, figure 28) recommend
flexure adjustment starting positions for various
actuator types. Start with the flexure adjustment set
to the recommended starting distance from the gain
adjustment plate, the X dimension in figure 14. To
adjust the minor loop gain, proceed as follows:
1. Unscrew the four captive cover screws and
remove the cover (key 41, figure 28).
2. Refer to figures 13 and 14 and identify the gain
adjustment plate, the flexure adjustment (key 156),
and the X dimension between the plate and the
adjustment.
3. Loosen the flexure adjustment socket head screw
(key 55, figure 14) and slide the flexure adjustment
on the flexures to increase or decrease the X
dimension. Moving the flexure adjustment in the
direction of the arrow on the top flexure (decreasing
the X dimension) slows the positioner response.
Moving the flexure adjustment in the opposite
direction speeds up the positioner response.
20
Actuator Type Number
1052/20
1051, 1052/30, 33, and 40
1051, 1052/60-
1052/70
1061/30
1061/40
1061/60
1061/80
1061/100
1069/100
585C/25 and 50
585/100
GAIN ADJUSTMENT
PLATE
FLEXURE
ADJUSTMENT
(KEY 156)
20B1277-E
A3233-2 / IL
Figure 14. Minor Loop Gain Adjustment
4. Tighten the flexure adjustment screw and check
the positioner response. Repeat step 3 if
readjustment is required.
5. If this is the only adjustment, replace the cover. If
not, continue with the Crossover Adjustment.
Crossover Adjustment
Perform one or the other of the following procedures,
depending on the positioner and actuator type.
When finished with the crossover adjustment,
proceed to the zero and span adjustments.
Spring and Diaphragm Actuators
(3610J or 3620J Positioners)
Do not perform these steps 1 through
6 if calibrating a 3610JP, 3611JP,
3620JP, or 3621JP positioner. These 6
steps are only applicable to 3610J and
3620J positioners used on spring and
diaphragm actuators.
1. Unscrew the four captive cover screws and
remove the cover (key 41, figure 28).
Instruction Manual
June 2008
"X" Dimension
mm
Inches
22
7/8
24
15/16
35
1-3/8
38
1-1/2
21
13/16
22
7/8
24
15/16
27
1-1/16
29
1-1/8
44
1-3/4
33
1-5/16
SOCKET HEAD
SCREW (KEY 55)
TOP FLEXURE
(RELAY BEAM
FLEXURE)
Note
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