3.3 Electrical connection
CAUTION
When DC power is connected to a solenoid valve equipped with light and/or surge voltage suppressor, check
for polarity indications.
For polarity indications:
No diode to protect polarity: if polarity connection is wrong, the diode in the valve or switching device at
control equipment or power supply may be damaged.
With diode to protect polarity: if polarity connection is wrong, the valve does not switch.
CAUTION: Light/surge
CAUTION: Connection of 24V
voltage suppressor
or more DC
For the grommet type, connect the positive (+) side to the red
lead wire and connect the negative (-) side to the black lead wire.
For the DIN terminal, connect the positive (+) side to the
connector’s No.1 terminal and connect the negative (-) side to the
No.2 terminal.
(See the markings on the terminal block.)
For 12V or less DC, positive (+) and negative (-) can be
connected in either direction.
CAUTION: Use of DIN Connector
Connection procedure
Loosen the holding screw, and pull the connector out of the solenoid valve terminal block.
After removing the holding screw, insert the flat head screw driver, etc. into the notch on the bottom of
the terminal block and pry it up, separating the
terminal block and the housing.
Loosen the terminal screws (slotted screws) on
the terminal block, insert the core of the lead
wire into the terminal in accordance with the
prescribed connection method, and attach
securely with the terminal screws.
Fasten the cord by screwing in the gland nut.
Cord entry changing procedure
After separating the terminal block and housing,
the cord entry direction can be changed by
attaching the housing in the desired direction
(4 directions in 90° increments).
*When equipped with light, handle with care so
that the light is not damaged by the cord’s lead
wires, etc.
Precautions
The connector should be inserted and pulled out in a straight line without tilting diagonally.
Compatible cables
Cord outside diameter: ø4 to ø6.5 (Reference)
0.5mm
2
equivalent to JISC3306, 2 wire or 3 wire
Connector part no.: VK300-37-1
Part No. for connector with light
Circuit diagram for connector with light
Rated voltage
Rating symbol
Part No.
100VAC
A1
VK300-37-2-01
200VAC
A2
VK300-37-2-02
240VAC
A3
VK300-37-2-07
6VDC
LW06
VK300-37-4-51
12VDC
LW2
VK300-37-4-06
24VDC
LD4
VK300-37-3-05
48VDC
LD8
VK300-37-3-53
3.4 Mounting
CAUTION
After confirming the installation of the
gaskets, securely tighten the screws to the
tightening torque shown in the table below:
The bushing may be damaged if the tightening
torque of 0.8Nm is exceeded. In the event that
damage does occur, be sure to replace the
bushing.
2 sets per unit are required.
3.5 Lubrication
CAUTION
SMC products have been lubricated for life at manufacturer, and do not require lubrication in
service.
If a lubricant is used in the system, use turbine oil Class 1(no additive), ISO VG32. Once lubricant
is used in the system, lubrication must be continued because the original lubricant applied during
manufacturing will be washed away.
4
SETTINGS AND PROGRAMMING
4.1 Manual override operation
WARNING
When the manual override is operated, connected equipment will be actuated.
Confirm safety before operating.
Non-locking push type (tool required)
There are manual overrides in 2 directions, on
the top and on the side (solenoid side).
By pressing either of the manual overrides in
the direction of the arrow (
→
) until it stops
(approx. 1mm), it will turn ON, and it turns
OFF when released.
5
MAINTENANCE
WARNING
Not following proper procedures could cause the product to malfunction and could lead to damage
to the equipment or machine.
If handled improperly, compressed air can be dangerous. Assembly, handling and repair of
pneumatic system should be performed by qualified personnel only.
Drain: remove condensate from the filter bowl on a regular basis.
Shut-down before maintenance: before attempting any kind of maintenance make sure the supply
pressure is shut off and all residual air pressure is released from the system to be worked on.
Start-up after maintenance: apply operating pressure and power to the equipment and check for
proper operation and possible air leaks. If operation is abnormal, please verify product set-up
parameters.
Do not make any modification to the product
Do not disassemble the product, unless required by installation or maintenance instructions.
5.1 Manifold mounting
Refer to paragraph 3.4, for mounting valves onto manifolds.
6
LIMITATIONS OF USE
WARNING
Do not exceed any of the specifications laid out in section 2 of this document or the specific product
catalogue.
Long continuous loading time
When power will be applied continuously for extended periods of time, use type VKF33*E. However, it cannot
be used with high frequency. Contact SMC if it will be operated more than once a day.
Be sure to perform switching at least once every 30 days.
CAUTION
Leakage voltage
Particulary when using a resistor in parallel with a switching
element, take note that leakage voltage will increase due to
leakage current flowing through the resistor. Limit the
amount of residual leakage voltage to the following values.
For AC coil: 20% or less of rated voltage
For DC coil: 2% or less of rated voltage
Low temperature operation
Operation is possible to -10°C, but measures should be taken to avoid solidification or freezing of drainage
and moisture, etc.
Mounting orientation
The mounting orientation is unrestricted.
7
EUROPEAN CONTACT LIST
SMC Corporation
Country
Telephone
Country
Telephone
Austria
(43) 2262-62 280
Italy
(39) 02-92711
Belgium
(32) 3-355 1464
Netherlands
(31) 20-531 8888
Czech Republic
(420) 5-414 24611
Norway
(47) 67 12 90 20
Denmark
(45) 70 25 29 00
Poland
(48) 22-548 50 85
Finland
(358) 9-859 580
Portugal
(351) 22 610 89 22
France
(33) 1-64 76 1000
Spain
(34) 945-18 4100
Germany
(49) 6103 4020
Sweden
(46) 8-603 0700
Greece
(30) 1- 342 6076
Switzerland
(41) 52-396 3131
Hungary
(36) 1-371 1343
Turkey
(90) 212 221 1512
Ireland
(351) 1-403 9000
United Kingdom
(44) 1908-56 3888
Websites
SMC Corporation
www.smcworld.com
SMC Europe
www.smceu.com
Bushing assembly part no.
VKF300-6A-1
Grommet type
DIN terminal
Red (+)
Black (-)
Surge voltage
suppressor
* Marking
Light
(built into connector
Surge voltage
suppressor
(built into
terminal block)
* Markings
For 24V or more DC
For AC and 12V or less DC
1
(-)
(+)
2
Gland nut
Washer
Grommet
(rubber)
Holding screw
Light mounting location
Terminal block
Notch
Terminal screw
(3 places)
Rating symbol
(see table below)
Housing
Appropriate tightening torque (Nm)
0.6 to 0.8
AC
Circuit diagram
12VDC or less
Circuit diagram
24VDC or more
Circuit diagram
LED
NL
R
LED
R
R
2
2
2
1
1
1
NL: Neon light
R: Resistor
LED: Light emitting diode
R: Resistor
D: Protective diode
LED: Light emitting diode
R: Resistor
Mounting screw
Bushing
Switching element
Valve
OFF
Leakage current
Power
supply
Resistor
Leakage
voltage
Hole dia. ø5
ø9
D
VKF300-TFH35GB
