Pneumatic System Fault — Low Air Pressure
What This Fault Means
A low air pressure fault means the system pressure dropped below the minimum threshold required for reliable actuator operation. Pneumatic cylinders and valves may operate slowly, weakly, or not at all.
Common Causes
- Air leak in supply lines, fittings, or cylinders
- Compressor unable to keep up with demand
- Clogged air filter/regulator at the FRL unit
- Regulator set too low or failed
- Drain valve on the receiver tank stuck open
Recommended Fix
- Check the main air receiver pressure — if low, the compressor can't keep up (see compressor faults).
- Perform a leak audit: pressurize the system, shut off supply, monitor the pressure drop rate.
- Use an ultrasonic leak detector to pinpoint leaks at fittings and cylinders.
- Inspect and clean the FRL filter element — replace if clogged.
- Verify the regulator output pressure matches the system requirement (typically 6 bar / 90 psi).
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