Design & Selection - CKD PPX Series Manual

Pneumatic components (electronic pressure switch and sensors)
Safety precautions
Always read this section before starting use.
Refer to "Pneumatic, vacuum and auxiliary components CB-024SA".
WARNING
Use this product in accordance of specifi cations.
Applications, load current, voltage, temperature, shock and
working environment, etc. exceeding the specifi cations
range could lead to destruction and malfunction of periph-
eral equipment.
Do not use oxygen, corrosive or combustible
gas, or toxic fl uid for this product.
Do not use this product in fl ammable atmo-
sphere
The pressure switch is not explosion proof. Do not use this
product in fl ammable atmosphere, or explosions could oc-
cur.
Do not install the product in completely sealed
enclosure.
The internal pressure in the closed chamber could change
if the fl uid leaks in an accident. Use this product in the con-
trol box with safety device to control internal pressure, or
indoors with no pressure differential from the outside.
Power voltage
Use the product within the specifi ed power voltage range. If
voltage exceeding specifi ed rage is applied, or alternating cur-
rent power (100 V AC) is applied, circuit damage could occur.
Load short circuit
Do not short-circuit the load, or circuit damage could occur.
Incorrect wiring
Avoid incorrect wiring such as connecting to the wrong electrode
of the power source, etc., or the circuit damage could occur.
CAUTION
Working fl uid
When using working fl uid other than air; nitrogen gas, etc.,
oxygen defi ciency could be caused. Observe the following in-
structions.
Use this product in well ventilated location.
Ventilate the work area when nitrogen gas is being used.
Inspect piping regularly, so nitrogen gas does not leak.
If this product is used for vacuum suction confi r-
mation, care must be taken for following matters.
The pressure exceeding withstanding pressure in the speci-
fi cations must not be applied to the product if positive pres-
sure of vacuum break is applied.
Working environment
Avoid use in the place that vibration or shock not less than
100m/s is applied.
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Intro 3
Design & Selection
Care must be taken in not exceeding media and ambient
temperature range in cluding pipng area.
Do not use the product in locations that water or oil may contact the products.
Considering errors, etc. caused by precision/
temperature characteristics, decide the setting.
Care must be taken when this product is used in
an interlock circuit.
When a pressure switch is used to issue interlock signals, if
high reliability is required, provide mechanical guards for a
failure, or provide dual interlock as a switch (sensor) other
than pressure switch is used. Execute inspection regularly
to check that the normal operation is done.
Responsiveness is adversely affected depended
on working pressure and volume of loads. Install
a regulator before the sensor if stable repeatabil-
ity is required.
Use conditions to comply with CE marking
PPX series is CE marked products complied with EMC di-
rective. EN61000-6-2; regulation matched to immunity ap-
plies to this product. Conditions below are necessary to
comply with these standards.
Conditions
Length of power line connected to the sensor is to be less than 10m.
Take the following countermeasures to prevent
malfunction caused by noise.
Provide a line fi lter in AC power line.
Do not share power with an inverter or components causing
motor noise, etc.
Remove noise from inductive load (such as solenoid valve
and relay) with a surge suppressor such as CR or diode in
the source side.
When using components (such as switching regulator and
inverter motor) causing noise around the sensor installation
section, ground a frame ground (F.G.) terminal of compo-
nents.
Keep distance between a line connected to sensors and
strong magnetic fi eld.
Connect a line connected to sensors with shield wire.
Connect shield wire to the ground of power side.
When the secondary side control pressure is re-
leased to atmosphere as air blow, pressure may
fl uctuate depended on piping and blow condi-
tions. Execute a test under actual working condi-
tions or contact to CKD.
Select the product whose fl ow is not less than
the total of that used for sensors when selecting
a dryer, an air fi lter, an oil mist fi lter and a regula-
tor.