Mounting; Piping - SMC Networks VQC1000 Series Operation Manual

VQC1000/2000 Series
Precautions for 5 Port Solenoid Valve ②
Design / Selection
Caution
3. Surge voltage suppressor
1) The surge voltage suppressor built into the valve is intended to
protect the output contacts so that the surge generated inside
valve does not adversely affect the output contacts. Therefore, if
an overvoltage or overcurrent is received from an external
peripheral device, the surge voltage protection element inside the
valve is overloaded, causing the element to break. In the worst
case, the breakage causes the electric circuit to enter
short-circuit status. If energizing continues while in this state, a
large current flows. This may cause secondary damage to the
output circuit, external peripheral device, or valve, and may also
cause a fire. So, take appropriate protective measures, such as
the installation of an overcurrent protection circuit in the power
supply or a drive circuit to maintain a sufficient level of safety.
2) If a surge protection circuit contains nonstandard diodes, such
as Zener diodes or varistor, a residual voltage that is in proportion
to the protective circuit and the rated voltage will remain.
Therefore, take into consideration the surge voltage protection of
the controller.
In the case of diodes, the residual voltage is approximately 1 V.
4. Surge voltage intrusion
With non-polar type solenoid valves, at times of sudden
interruption of the loading power supply, such as emergency
shutdown, surge voltage intrusion may be generated from7
loading equipment with a large capacity (power consumption),
and a solenoid valve in a de-energized state may switch over
(see Figure 1).
When installing a breaker circuit for the loading power supply,
consider using a solenoid valve with polarity (with polarity
protection diode), or install a surge absorption diode between the
loading equipment COM line and the output equipment COM line
(see Figure 2).
Be sure to read before handling.
5. Operation in low temperature condition
It is possible to operate a valve in extreme temperature, as low
as -10 ℃. Take appropriate measures to avoid freezing of
drainage, moisture etc. in low temperature.
6. Operation for air blowing
When using a solenoid valve for air blowing, use an external pilot
type.
Use caution because the pressure drop caused by the air blowing
can have an effect on the internal pilot type valve when internal
pilot type valves and external pilot type valves are used on the
same manifold.
Additionally, when compressed air within the pressure range of
the established specifications is supplied to the external pilot type
valve's port, and a double solenoid valve is used for air blowing,
the solenoids should be energized when air is being blown.
7. Mounting orientation
Rubber seal : Mounting orientation is free.
Metal seal : Mounting orientation of a single solenoid is universal.
No specific
installing a double solenoid or a 3-position
configuration, mount the valve so that spool valve
is horizontal.
8. Initial lubrication of main valve
The following initial lubricant has already been applied to the
main valve.
• Rubber seal, spool valve: Grease
• Metal seal, spool valve: Turbine oil
Turbine oil is applied to the spool valve of the metal seal type.
Therefore, turbine oil may seep out when a new product is
delivered or while the valve is in storage.
9. For the pilot EXH (PE) port
If the solenoid valve and the manifold's pilot EXH (PE) port is
restricted extremely or blocked, abnormal operation of the
solenoid valve may occur.
Warning
1. Operation manual
Install the products and operate them only after reading the
operation manual carefully and understanding its contents. Also,
keep the manual where it can be referred to as necessary.
2. Ensure sufficient
activities.
When installing the products, allow access for maintenance and
inspection.
3. Tighten threads with the proper tightening torque.
When installing the
specifications.
4. If air leakage increases or equipment does not
operate properly, stop operation.
Check mounting conditions when air and power supplies are
connected. Initial function and leakage tests should be performed
after installation.
5. Painting and coating
Warnings or specifications printed on or affixed to the product
should not be erased, removed, or covered up.
Please consult with SMC before applying paint to resinous parts, as
this may have an adverse effect due to the solvent in the paint.
.
Caution
1. Refer to the Fittings and Tubing Precautions
(Best Pneumatics No.6) for handling One-touch
fittings.
2. Preparation before piping
Before piping is connected, it should be thoroughly blown out
with air (flushing) or washed to remove chips, cutting oil and
other debris from inside the pipe.
- 5 -
orientation is necessary. When

Mounting

space for maintenance
products, follow the listed

Piping

No.VQC1000V-OMM0002-B
torque