PSN1 / PSN3
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: +81(6)6659-8201 Fax: +81(6)6659-8510 E-mail: [email protected]
EM-4857 Rev.10 P. 5 / 9
ADJUSTMENT PROCEDURE
Open the PSN body cover and adjust the full-open and
-closed positions referring to Figure 1. Other adjustments
can be also conducted as explained below: switching actua-
tor action, safety operation at abnormally low input, and
positions for the open/close limiters and for the full-open/
close signal, and restart limiting timer.
For adjusting positions for the open/close limiters and for
the full-open/close signal, and restart limiting timer, the
PU-2x is required.
■
OPERATION AT ABNORMALLY LOW INPUT (SW-1, SW-2)
When the input goes down to 0.37±0.1V DC or below, the
PSN goes to the abnormal low input operation. It is set to
stop the actuator at the factory. Refer to Table 1.
Table 1. Abnormal low input operation & switch positions
MODE
SW-1
SW-2
Stop
Fully Extend
Fully Retract
*1
OFF
ON
ON
OFF
OFF
*1. SW-1 position is disregarded in STOP mode.
SW-1...SW-8
1
O
N
2
3
4
5
6
7
8
UP Control Button
DOWN Control Button
OPEN
FORCED
OPEN/CLOSE
COMMAND
SEQUENTIAL
CONTROL
CLOSE
COM1
–
COM1
+
COM2
12
11
FULL OPEN
FULL CLOSE
ALARM
10
9
8
7
6
5
4
3
INPUT SIGNAL
POSITION SIGNAL
1
2
POWER
V(–)
U(+)
POWER
INPUT
ALARM
UP
DOWN
1 CLOSE/OPEN
2 ACCORDING TO SW1/STOP
3 REVERSE/DIRECT
4
5 FULL-OPEN POSITION SET
6 FULL-CLOSED POSITION SET
7
8 RUN/PU
FUSE
Figure 7. Adjustments, Details
■
ACTUATOR ACTION (SW-3)
Use SW-3 for switching the actuator action. It is set to “RE-
VERSE” at the factory. Refer to Table 2.
Table 2. Actuator action
MODE
SW-3
ACTION
Direct
ON
Output stem retracted with decreasing
input. (Valve stem pulled out.)
Reverse
OFF
Output stem extended with decreas-
ing input. (Valve stem pushed in.)
In DIRECT action, the input signal 0 – 100% corresponds to
the position output signal 20 – 4mA DC.
■
FULL-OPEN/CLOSED POSITIONS
1) Turn ON the SW-8 in order to put the PSN in the local
calibration mode, and the input signal is disregarded.
2) Turn ON the SW-5 and adjust the fully retracted end
pressing UP/DOWN control buttons.
3) When the output stem reaches a desired position, turn
OFF the SW-5. The position is memorized as the fully
retracted end.
4) Turn ON the SW-6 and adjust the fully extended end
pressing UP/DOWN control buttons.
5) When the output stem reaches a desired position, turn
OFF the SW-6. The position is memorized as the fully
extended end.
6) Turn OFF the SW-8 in order to put the PSN in the op-
erating mode. Apply input signals and confirm the full-
open/closed positions.
■
SEALING SPRING
For applying a sealing pressure when the valve is fully
closed, adjust flexure of the sealing spring when calibrating
the fully opened/closed positions.
For applying a sealing pressure at the both ends, such like
the case of a three-way valve, adjust flexure of the sealing
spring at the both ends.
Excessive flexure may shorten life of the actuator and
spring. Observe the maximum flexure at the maximum
pressure.
The output stem is provided with scales by millimeters.
Output Stem
Sealing Pressure
Scale
Figure 8. Sealing Spring
TYPE
MAXIMUM
PRESSURE
(N)
FLEXURE AT
MAXIMUM
PRESS. (mm)
SET
PRESS.
(N)
RATED
SPRING
(N/mm)
1500 N use
3000 N use
5000 N use
1500
3000
5000
1
1
0.5
1170
2410
3980
330
590
2040
1500 N use
3000 N use
5000 N use
(lb)
337
674
1124
(inch)
0.04
0.04
0.02
(lb)
263
542
895
(lb/in.)
1880
3370
11600
Note: The seal spring starts flexing when a pressure exceeding
the set pressure is applied. Control pressure within 80%
of the set pressure except when the valve is fully closed.
If excessive pressure is applied within the control range,
flexure of the spring may jeopardize the linearity.
