Enclosure pressure control regulator will not hold a safe pressure
Possible Causes
Leakage around gasketing, covers, seams, piping and tubing connections, conduit connections and electrical conduit seals of the enclosure

Corrective Action
Tighten enclosure latches. Where tightening is not feasible, and gasketing materials are not practical, holes or gaps can be closed with silicone sealant applied from inside the protected enclosure

Enclosure pressure control regulator will not hold a safe 1.0 inch pressure
Possible Causes
Leakage around gasketing, covers, seams, piping and tubing connections, conduit connections and electrical conduit seals of the enclosure

Corrective Action
Tighten enclosure latches. Where tightening is not feasible, and gasketing materials are not practical, holes or gaps can be closed with silicone sealant applied from inside the protected enclosure

Enclosure pressure control valve with not hold a 'safe' .25 inch pressure
Possible Causes
Leakage around gasketing, covers, seams, piping and tubing connections, conduit connections and electrical conduit seals of the enclosure

Corrective Action
Tighten enclosure latches. Where tightening is not feasible, and gasketing materials are not practical, holes or gaps can be closed with silicone sealant applied from inside the protected enclosure

Enclosure pressure indicator reading is difficult to stabilize
Possible Causes
Insufficient enclosure leakage or opening of the venturi orifice is crimped too small

Corrective Action
Remove the orifice, cut off the crimped end and ream the tube, then recrimp and reinstall the tube to note effect. As tube is shortened, reamed and recrimped, sensitivity decreases, allowing easier adjustment of setpoint on the enclosure

Enclosure pressure indicator 'drifts' up or down from the 'safe' pressure setting
Possible Causes
Application involves a small, tightly sealed enclosure and/or a fluctuating protective gas supply

Corrective Action
Pre-regulate the protective gas supply upstream of the enclosure protection system to 5 PSI maximum. For dramatic fluctuations in the protective gas supply, it may be necessary to utilize a self-relieving low flow precision regulator to pre-regulate the protective gas supply

Return to Top

Enclosure Pressure Indicator reads a safe pressure but the safe pressure LED is not illuminated
Possible Causes
Conduit seal between the EPCU and protected enclosure is not poured or is leaking pressure back into the EPCU. EPCU Breather drain is clogged (all systems except PM configurations). Safe pressure switch is out of calibration

Corrective Action
With area positively known to be non-hazardous, remove screw cover of the EPCU and attempt a complete start-up procedure. If the system works properly, check enclosure power conduit seal for leakage and the EPCU breather drain for blockage. If the system does not operate properly, calibrate the safe pressure switch. Calibrate by slowly adjusting counterclockwise to decrease the setpoint, and clockwise to raise the setpoint. (Do not attempt to calibrate the switch until all efforts to make the switch respond properly have failed).

Rapid Exchange LED does not illuminate when Rapid Exchange is engaged.
Note: This applies to the FA Style only- the Rapid Exchange solenoid continues to cycle without starting the RET timer.

Possible Causes
Conduit seal between the EPCU and protected enclosure is not poured or is leaking pressure back into the EPCU. EPCU Breather drain is clogged (all systems except PM configurations). Rapid Exchange pressure switch is out of calibration

Corrective Action
With area positively known to be non-hazardous, remove screw cover of the EPCU and attempt a complete start-up procedure. If the system works properly, check enclosure power conduit seal for leakage and the EPCU breather drain for blockage. If the system does not operate properly, calibrate the Rapid Exchange pressure switch. With Rapid Exchange engaged, calibrate by slowly adjusting counterclockwise to decrease the setpoint, and clockwise to raise the setpoint. (Do not attempt to calibrate the switch until all efforts to make the switch respond properly have failed).

Problem persists, or if the system does not appear to be operating properly
Possible Causes 
Unknown

Corrective Action
Contact Pepperl+Fuchs Applications / Customer Service Department at 330-486-0002 or sales@us.pepperl-fuchs.com.

Return to Top