30
f. Silencer on the solenoid valve
Use of the SMC AN40-04 is recommended. Connect the silencer to the normally-closed exhaust port 5(R
1
)
of the solenoid valve when the SMC SY9140-5-04-X90 is used.
g. Piping between the SV and the silencer.
Do not use a tube for the connection. Use a male reduced bush and directly connect the silencer to the SV.
h. Piping between the solenoid valve and the regulator
Always use the same pipe length (PFA, 1m or less, 10mm I.D. × 12mm O.D.) to both right and left air lines.
i. Regulator (REG)
Always use the same regulator to both right and left air lines. Use of the SMC AR40-04 or CKD W4000-W is
recommended. Be sure to keep the same set pressure between the right and left regulators (max allowable
deviation is ±0.01MPa). Use the SMC PSE540A-01 analogue pressure sensor in the regulator and moni-
tor the supply air pressure with the LPC-1 controller. See the "
Regulator set pressure confirmation (8.
PRESSURE SENSOR)
" section on page 60 for detail.
j. Connection between the compressor and the regulator
Lay the supply air line shortest with a wider I.D. than the regulator inlet (to keep the composite effective
cross-sectional area as much wide as possible.).
k. Air compressor
Air compressor must keep 0.1MPa or higher than the set pressure of the regulator during pump stop. If the
supply air pressure from the compressor is the same or lower than the set pressure, a pressure drop causes
discharge pulsation.
* Install an air tank (18L or more) in the supply air line (j) close to the regulator (i) when the above differential pressure is
not satisfied in anyway. Discharge pulsation can be reduced.
l. Connection of a purge air line
A temperature of the displacement sensor may rise high along with liquid and ambient temperatures.
Connect a purge air line to the pump via the I.D.6mm air port (straight fitting) to deliver the necessary
amount of air and keep the sensor temperature to 45°C or below. For example, supply 380NL/min or more to
this line when liquid temperature is 180°C and ambient temperature is 60ºC.
* The displacement sensor may stop operation when its temperature rises above 78ºC.
Air line piping