SMC Networks SV Series Manual page 2

3/4/5-Port Solenoid Valves
Precautions 2
Be sure to read this before handling products.
Warning
Latching Type
[VQ/SQ series double (latching) type]
The latching solenoid is equipped with a self-holding mechanism
which permits the movable iron core in the solenoid to hold the
set position or reset position during momentary energization (20
ms or longer), so there is no need for continuous energization.
Depending on conditions, continuous energization may cause a
rise in the coil temperatures, resulting in a malfunction.
<Special precautions to be taken with the latching type>
1) Do not continuously energize the latching type.
When it is necessary to energize it continuously, keep the
energized period to 10 minutes or less, and then leave a
de-energized period (on both the A side and B side) lasting
longer than the energized period, before operating it again.
The duty ratio should be 50% or less.
ON
A side
OFF
ON
B side
OFF
ON time
(10 minutes or less)
OFF time
ON time + OFF time
• Maximum ON time is 10 minutes.
• Duty ratio ≤ 50% Duty ratio =
Example: When energization lasts for five minutes, it should be
followed by five or more minutes of de-energization. Be-
cause the latching type has only one solenoid, both the
A side and B side should be off for five minutes or more.
However, a minimum energization time of 20 ms is recommended.
[Ambient temperature]
The product should be installed in an environment with an
ambient temperature of –10° to 50°C. Especially in environments
with poor heat dissipation, such as in a panel, the heat of the coil
can cause the ambient temperature to rise, so please exercise
caution.
2) Use a circuit in which the set and reset signals will not be
energized at the same time.
3) The minimum energization time for self-holding is 20 ms.
4) Even when there is no problem with normal operations and
locations, please consult with SMC before using in locations
with a vibration of 30 m/s or more or a strong magnetic field.
2
5) Even though this valve is set to the reset position at the time of
shipment (passage: A → R), it may switch to the set position
during transportation or due to impact when mounting valves,
etc. Therefore, check the initial position with the power supply
or by performing a manual override prior to use.
Latching Passage Indicator light
A-C
P → A
Red
ON (set)
B-C
A → R
Green
ON (reset)
Design/Selection
ON time
OFF time
(10 minutes or less)
ON time + OFF time
ON time
ON time + OFF time
Single Passage Indicator light
P → A
A-C ON Red
A → R
OFF —
Caution
1. Precautions for 2-position double solenoid
valves
If a double solenoid valve is operated with momentary energi-
zation, it should be energized for at least 0.1 seconds.
However, depending on the piping conditions, the cylinder
may malfunction even when the double solenoid valve is
energized for 0.1 seconds or longer. In this case, energize the
double solenoid valve until the cylinder is exhausted
completely.
2. Leakage voltage
Take note that the leakage voltage will increase when a
resistor is used in parallel with a switching element or when a
C-R circuit (surge voltage suppressor) is used for protecting a
switching device because of the leakage voltage passing
through the C-R circuit. The suppressor residual leakage
voltage should be as follows.
Switching element
C
Leakage current
DC coil
• SV, SY, SYJ, SX, SZ, SJ, VV061 (V060),
VQ (V100), VQC (V100), SQ (V100),
VQZ, VF, VFR, VFS, VP7, VS7, VP300,
VP500, VP700, VT307, VG342
• VQD, VZ, VZS, VK, VT317,
VT325
• VT301, VT315, VP315,
VP450, VP470
AC coil
• VK, VFR, VFS, VP7, VS7, VT317
• VZ, VZS, VT307, VG342, VT301, VT315,
VT325, VP315, VT450, VP470
• SY, SYJ, VQZ,VF, VP300,
VP500, VP700, VQ (V100)
3. Valves with a power-saving circuit (PWM circuit
built-in type)
Valves with a power-saving circuit (PWM circuit built-in type)
perform the high-speed switching operation with the PWM
control circuit inside the valve after the rated power has been
applied for several tens of ms to reduce the power consump-
tion. The problems shown below may occur in this type of
valve due to the switch or drive circuit system by the PWM
control. Be sure to check the operation with the customer's
machine sufficiently when selecting the product.
1) The valve does not turn ON.
1. If the PWM circuit built-in type valve is driven by a
mechanical relay, etc., and chattering occurs during the
several tens of ms necessary for the valve to reach its
rated voltage, the valve may not turn ON correctly.
2. If a filter, etc., is connected between the power supply
and the PWM circuit built-in type valve, the current
necessary to drive the valve lowers due to the effects of
the filter, and then the valve may not turn ON correctly.
OFF
R
SOL.
3% or less of the
rated voltage
2% or less of the
rated voltage
5% or less of the
rated voltage
20% or less of the rated voltage
15% or less of the
rated voltage
8% or less of the rated voltage
4
A