SMC Networks PFCA7 Series Operation Manual page 67

Problem
Entry of foreign matter
Piping in the reverse
direction
Air leakage
Flow does not start
Flow is unstable
Pressure fluctuation
The control accuracy
does not meet the
specifications
Insufficient or excess
pressure
Fluid and reference
condition mismatch
Insufficient
warming-up time
The product failed
Possible cause
Check for foreign matter entry or
sticking to the piping port.
Check the fluid direction.
Check if air is leaking from the
piping.
Check if the pressure is
fluctuating.
Check if the pressure is within the
product specification.
Check any pressure loss in the
piping or filter.
Check to see if the fluid and
reference condition are consistent
with the operating conditions.
Check the product operation after
10 minutes have passed after
turning on the power.
Investigation method
-67-
Countermeasures
Use a filter to prevent foreign
matter from entering or sticking.
Discharge the condensate of
the filter periodically.
Mount the product so that the
fluid flow direction is the same
as the arrow indicated on the
product label.
Rework the piping. If the
tightening torque is exceeded,
the mounting screws, brackets
and the pressure switch may be
damaged.
It is possible that pulsation is
generated due to the
characteristics of the
compressor acting as the
pressure source or the pump.
Change to a pressure source
with less fluctuation or install a
tank which reduces the
pressure fluctuation.
Use the product within the
operating differential pressure
and operating pressure range.
Set the fluid and reference
condition according to the
operating conditions.
After energizing, the display
and output can drift.
Allow the product to warm up
for at least 10 minutes.
Replace the product.
No.PF※※-OMA1002