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SJ1000/2000/3000/4000
Specific Product Precautions 1
Be sure to read this before handling the products. Refer to the back cover for safety instructions.
For 3/4/5-port solenoid valve precautions, refer to the "Handling Precautions for SMC Products"
and the "Operation Manual" on the SMC website: https://www.smcworld.com
Manual Override Switch Operation
Warning
For manual override operation, move the manual override switch
to a position where letters A and B can be seen. [Manual override
switch release status (refer to the figure below)] Operation with
the manual override switch in a locked status can cause damage
to the manual override and air leakage, so be sure to release the
manual override switch before use. After manual override opera-
tion, lock the manual switch for use (when the manual override of
the push-turn locking slotted type is locked, a manual override
switch cannot be locked).
Manual override switch
locked status
Manual Override Operation
Warning
When the manual override is operated, connected equipment will
be actuated. Confirm safety before operating.
Non-locking push type
Press in the direction of the arrow.
Manual override switch
Manual override for solenoid b
Yellow
Solenoid a
Solenoid b
Push-turn locking slotted type
While pressing, turn in the direction of the arrow (90° clockwise).
If it is not turned, it can be used in the same way as the non-
locking push type.
Manual override switch
Manual override for solenoid a
Blue
Manual override for
solenoid b
Yellow
Solenoid a
Solenoid b
Slide locking type (manual override)
Slide the manual override all the way to the ON side in the ar-
row direction. The manual override is then locked. To unlock
the manual override, slide it toward the OFF side in the arrow
direction.
OFF
ON
Caution
When you operate the D type with a screw driver, turn it gently us-
ing a watchmaker' s screw driver. [Torque: under 0.05 N·m] When
you lock the manual override of the D type, be sure to push it be-
fore turning. [Load: 10 N or less] Turning without pushing can
cause damage to the manual override and trouble such as air
leakage, etc.
Manual override
switch slide
direction
Manual override switch
unlocked status
Manual override for solenoid a
Blue
SJ1000:
Manual override dia. ø2.4
SJ2000:
Manual override dia. ø2.9
SJ3000/4000:
Manual override dia. ø3.4
Enlarged view of
manual override part
Enlarged view of
manual override part
Series
Valve with Switch
Warning
When turning OFF the valve using the switch, move it to the posi-
tion where the valve is locked. If the switch is at an improper po-
sition and is energized, equipment connected to the valve could
be actuated.
Also, if the switch is turned OFF on the valve in the energized
state, be careful because any actuators connected to a single so-
lenoid, a dual 3-port valve, or a 3-position valve will actuate.
ON position
Switch
OFF
ON
Normal operation: The valve is
switched according to electric
signals from the connector on
the manifold side.
Electric circuit diagram
(with positive common and light/surge voltage suppressor)
[SOL.b]
(–)
Switch
COM
(+)
[SOL.a]
(–)
(with negative common and light/surge voltage suppressor)
[SOL.b]
(+)
Switch
COM
(–)
[SOL.a]
(+)
Built-in Back Pressure Check Valve Type
Caution
1. Valves with built-in back pressure check valve is to protect the
back pressure inside a valve. For this reason, use caution the
valves with external pilot specification cannot be pressurized
from exhaust port [3/5(E)].
As compared with the types which do not integrate the back
pressure check valve, C value of the flow rate characteristics
(sonic conductance) goes down. For details, please contact SMC.
2. Do not switch valves when A or B port is open to the atmos-
phere, or while the actuators and air operated equipment are in
operation. The back pressure prevention seal may be peeled off,
which may cause air leakage or malfunctions. Use caution espe-
cially when performing a trial operation or maintenance work.
Exhaust Throttle
Caution
The SJ series pilot valve and main valve share a common ex-
haust inside the valve. Therefore, do not block the exhaust port
when arranging the piping.
OFF position
OFF
ON
The valve coil is kept in a deen-
ergized state even when there
is an electric signal from the
connector on the manifold side.
LED
(Green)
Coil
Coil
LED
(Red)
Polarity protection diode
LED
(Green)
Coil
Coil
LED
(Red)
Polarity protection diode
138
SJ
1000
2000
3000
4000
SJ3A6
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