Xylem 19 001 251 R3 Floboy VFD Pumping System - Manual (Page 33)

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Bad relief valve or pilot valve seat. Rebuild or replace valve.
Low suction pressure or supply water
restriction. Call the city if the city water pressure is lower than the normal
or published value. Check the supply piping for obstruction.
HIGH DISCHARGE PRESSURE FAULT
Cause Cure
High system pressure setting too low. Access “Menu->Safety->Low pressure: Set Point. Verify
is approx. 15 psi higher than set point. This is a gage
pressure setting, not relative to set point.
High system pressure time too short. Access “Menu->Safety->Low pressure: Set Point.
Normal setting is 60 seconds. Do not extend too far or
piping damage may occur.
System pressure transducer failure. Compare display readout to the pressure gauge.
Replace transducer (Flownet).
Isolation valve for DSR or main discharge is
closed. Open the valve.
DSR will not open fully. The pilot valve is set too low. Adjust as necessary,
15 PSI over set pressure.
The needle valve on the DSR is too far open; adjust as
necessary.
The ball valve(s) at the inlet and/or cover tapping(s)
closed. Open the valves.
The indicating stem is bent and/or sticking.
Irrigation demand is reducing too quickly. Reprogram irrigation to stage down in steps.
LOW LEVEL FAULT
Cause Cure
Clogged or shut off supply pipe. Check the supply pipe for restrictions or closed valve.
Clogged inlet screen. Check and clean the inlet screen.
Problem with level probes. Inspect probes for correct insertion depth.
Look for dirty or corroded probes.
To be performed by a qualified person only.
Look for broken probes, probe holder, or wires.
To be performed by a qualified person only.
Check for loose or incorrect probe wiring.
To be performed by a qualified person only.
Verify ground continuity between the station and wet
well.
Level relay failure (inside control panel). To be performed by a qualified person only.
Check relay for proper operation. Replace as required.
LOW INLET PRESSURE FAULT
Cause Cure
Normally used on flooded suction horizontal or canned turbine stations