Intro 3
Design & Selection
Pneumatic components (digital electro pneumatic regulator)
Safety precautions
Always read this section before starting use.
Thoroughly understand the characteristics of com-
pressed air before designing the pneumatic circuit.
The same functions as mechanical, hydraulic, or electrical methods cannot be
anticipated if instantaneous stop holding is required during an emergency stop.
Pop-out, air discharge, and leakage are caused by com-
pression and expansion of air characteristics.
Confirm that the product will withstand the working
environment.
This product cannot be used in an environment containing cor-
rosive gas, chemical liquids, solvents, water, vapor, or ozone. If
water drip, oil or metal chips (spatter or cutting chips, etc.) could
come in contact with the product, provide appropriate guarding.
This product cannot be used in the environment containing flammable gas.
Take care of electrical circuits during emergency stops
and cylinder operation during a service interruption.
Install a "pressure switch" and "shut-off valve" on the
device's compressed air inlet.
The pressure switch will disable operation until set pressure
is reached. The shut-off valve will exhaust compressed air in
the pneumatic pressure circuit, and will prevent accidents
caused by operation of pneumatic components by residual
pressure.
If the regulator is left with power off and primary pres-
sure applied, secondary pressure may rise to the
primary level. Due to the structure, a small amount
of air is consumed from the EXH port when second-
ary pressure is generated.
Set the primary regulator to 0 or use a valve on the
primary side to shut off the supply source when not
using the regulator.
WARNING
Response is affected by the working pressure and
load volume. If repeatability with stable response is
required, install a regulator before the product.
Do as follows to prevent malfunction due to noise.
Insert a line filter in the AC power supply line.
Use a surge suppressor, such as a CR or diode on the
conductive load (solenoid valve, relay, etc.), and remove
noise where generated.
Keep wiring to the device separate from strong magnetic
fields.
Connect wiring to the device with a shield wire.
Ground the shield wire on the power supply.
Keep the power cable as short as possible.
Do not share power with noise-generating devices such as
inverters or motors.
Do not lay power, signal, or other power cables in parallel.
Due to wiring, power ground and signal common are
the same for the current input type.
When driving several electropneumatic regulators with 1 PLC
and D/A, the D/A's circuitry could prevent the correct signal
from being input. Check with the PLC maker.
Current input is used with a 1-5 V input signal
but impedance is less than other voltage input
(250 ).Use an appropriate signal generator.
Poor air quality adversely affects function and life.
For the pneumatic pressure source, supply air free of sol-
ids, moisture, and oil using a dryer, air filter, or oil mist filter.
Air containing oil could adversely affect function.
When secondary pressure is lowered by an input signal, etc.,
secondary air passes through and is discharged from the
EXH port. Contamination of secondary piping and internal
load adversely affects function, so piping should be kept as
clean inside as possible.
If power is turned off during pressurization, secondary pres-
sure is maintained.
To set exhaust, lower the set pressure with the input signal
before turning power off or exhaust with a shutoff valve. There
is no guarantee that this held state can be maintained for a
long time.
CAUTION
Indicate the maintenance conditions in the device's
instruction manual.
The product's function can drop markedly with working sta-
tus, working environment, and maintenance, and can pre-
vent safety from being attained. With correct maintenance,
the product functions can be used to the fullest.
Confirm that power used is constant voltage.
Check leakage current to prevent the product from mal-
functioning due to leakage current from other controls.
When using a programmable controller, etc., leakage cur-
rent could cause the electro pneumatic regulator to mal-
function.
For 24 VDC
1.8mA or less
Regulator
Air filter
5 m
Air dryer
Oil mist filter
(Oil removing)
<Recommended air circuit>
(Pressure switch)
Содержание EVD Series
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