Fault: “E11 Low Input Pressure.” What should I do?
An E11 fault is the result of the high-pressure sensor reading input pressure below 35 psi. N2 input pressure is always monitored and the fault could occur at any point during a run. The fault will interrupt the run and wait for the operator to correct the problem. This problem can result from one of the following causes:
(1) The nitrogen tank has run low.
Most often this problem is because the nitrogen tank has run low and needs to be replaced, or because a valve was closed that supplied the instrument. This could also be because the regulator was inadvertently adjusted too low and needs to be reset, up to the correct input pressure (50-55 psi gauge pressure). Check the tank pressure and replace it if needed. Confirm that the regulator is set to 50-55 psi. If the problem is corrected, you can resume a run in progress.
(2) There is a substantial leak in one of the high-pressure nitrogen lines.
If there is a substantial leak in one of the high-pressure nitrogen lines, this would also cause an E11 fault. The loss of air from a leak would be audible and should be easily identified. Turn the instrument off and close the nitrogen lines. Replacement tubing, if needed, can be ordered as Black Nitrogen Supply Tubing (Part: #8216). It is sold per foot and can be cut to length.
(3) The regulator is not working correctly.
It is possible that the regulator is not working correctly. Check the regulator setting and compare it with the reading from the Pressures screen under Diagnostics. The Diagnostics / Pressures screen displays absolute pressure which includes atmospheric plus gauge pressure. Therefore, if the gauge pressure reads 50 psi and the atmospheric pressure is 14.5 psi, the pressure displayed in the Diagnostics / Pressures screen will be 64.5 psi. Confirm that the gauge pressure correlates with the Diagnostics / Pressures reading. If the regulator is not adjusting pressure correctly, it will not deliver the correct pressure. If this is the case, you will need to replace the Pressure Regulator 60 psi (Part#: TDF61). Refer to TDF Service Procedure High-Pressure Regulator Replacement (TS039)
(4) The High-Pressure Sensor circuit has shorted.
It is possible that the High-Pressure Sensor circuit has shorted. If the black and white wires on the High-Pressure Sensor (Part #: TDF16) have been shorted, a false low reading will result. If you confirm that the correct pressure is getting to the lines and the regulator is working correctly, then the pressure sensor will need to be replaced. Refer to TDF Service Procedure High-Pressure Sensor Replacement (TS002) to replace the High-Pressure Sensor Assembly.
For further assistance, contact ANKOM Technology at https://www.ankom.com/contact/technical-services or (315) 986-8090.