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Instruction Manual
June 2008
2. If the positioner does not have pressure gauges,
connect a pressure gauge to OUTPUT A.
3. Apply supply pressure.
4. Apply an input signal (pneumatic or electrical) to
the positioner to position the actuator at
approximately mid-travel. If necessary, you can use
the zero adjustment to position the actuator at
approximately mid-travel. The actuator should not be
under load during crossover adjustment.
Large step changes may cause the
supply pressure gauge reading to
momentarily drop.
5. Using a screwdriver, turn the crossover adjusting
screw (key 13, figure 13) counterclockwise until the
OUTPUT A pressure gauge reads zero pressure;
then turn it clockwise until full supply pressure is
obtained. Once supply pressure is obtained, turn the
adjusting screw an additional four, 360-degree turns
clockwise. The gauge should read supply pressure.
6. Continue calibration by performing the zero and
span adjustments.
Piston Actuators (3610JP, 3611JP,
3620JP, or 3621JP Positioners)
Do not perform these steps 1 through
6 if calibrating a 3610J or 3620J
positioner. These 6 steps are only
applicable to 3610JP, 3611JP, 3620JP,
and 3621JP positioners used on piston
actuators.
1. Unscrew the four captive cover screws and
remove the cover (key 41, figure 28).
2. If the positioner does not have pressure gauges,
connect pressure gauges to OUTPUT A and
OUTPUT B.
3. Apply supply pressure.
4. Apply an input signal (pneumatic or electrical) to
the positioner to position the actuator at
approximately mid-travel. If necessary, you can use
the zero adjustment to position the actuator at
approximately mid-travel. The actuator should not be
under load during crossover adjustment.
Note
Note
3610J and 3620J Positioners
COARSE SPAN
ADJUSTMENT
#5
SUMMING BEAM
#4
ASSEMBLY
(KEY 123)
#3
#2
#1
20B1277-E
A3232-2 / IL
Figure 15. Span Adjustment
Large step changes may cause the
supply pressure gauge reading to
momentarily drop.
5. Using a screwdriver, turn the crossover adjusting
screw (key 13) until the sum of the OUTPUT A and
OUTPUT B pressures is 140 to 160 percent of
supply pressure. Clockwise rotation increases the
OUTPUT A and OUTPUT B pressures.
Make sure that neither the OUTPUT A
pressure or the OUTPUT B pressure
equal the supply pressure when
adjusting the crossover screw. If either
pressure is equal to supply, an
accurate crossover setting cannot be
achieved. This may occur with the
3611JP or 3621JP positioner due to the
spring(s) in the 585, 585R, 585C, or
585CR actuator. If one of the cylinder
pressures equals supply pressure
when adjusting the crossover, do one
or both of the following:
a. Move the actuator to some position other than
mid-travel. This new position must be in the
direction which decreases the difference between
OUTPUT A and OUTPUT B (the direction which
reduces compression of the actuator springs).
The actuator or valve must not be contacting a
stop, but must be somewhere between the up
and down stops. With the lower differential
between the OUTPUT A and OUTPUT B
pressures, adjusting the crossover with neither
the OUTPUT A pressure or OUTPUT B pressure
equal to supply pressure should be possible. If
not, the supply pressure must be increased.
FINE SPAN ADJUSTMENT
(KEY 128)
FEEDBACK
LEVER
ASSEMBLY
(KEY 117)
RANGE
SPRING
HANGER
(KEY 130)
RANGE
SPRING
(KEY 150)
Note
Note
21
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