Xylem 19 001 251 R3 Floboy VFD Pumping System - Manual (Page 34)

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Inlet pressure switch is set too high. To be performed by a qualified person only.
Check the pressure switch setting.
(Located on lower left side of outside of enclosure.)
Pressure sensing line to pressure switch is clogged
or valved off. Ensure the valve is open, and blow out line if
necessary.
Pressure is actually low – static. If the city supplied water, check with them.
If the water is supplied by a tank, check the tank level,
and verify that the supply valve is open.
If equipped with a suction manifold strainer, clean as
required.
Ensure the supply piping not clogged or restricted.
Pressure is actually low – dynamic. Ensure that the flow rate is less than the supply
capacity.
LOSS OF PRIME FAULT
Cause Cure
Normally used on end-suction centrifugal pumps
System has lost prime or air is trapped in system. Check the system for prime lead in the foot valve or
suction line.
Probe is dirty, corroded, or failed. Clean or replace the probe as required.
Loss of prime relay failed. To be performed by a qualified person only.
Check the relay for proper operation. Replace as
required.
VFD FAULT
Cause Cure
Look at VFD keypad to determine specific fault and consult the VFD manual.
Codes identified below are some of the more common ABB 550 codes. Consult your specific VFD
manual for other drive applications.
Fault Code 2005 – Comm Fault.
Communications with the controller have failed. Verify communications cable is properly plugged into the
controller. Verify connections at the VFD. (Note: This
fault may be caused by normal operation of the controller
using this fault to turn on the VFD Fault Light. If there is
no VFD Fault on the controller, but other faults are
present (Low pressure, high pressure, etc) then this fault
is normal and will be reset when the primary fault is reset
(F5).
Fault code 3 – dev overtemp (drive heatsink is
overheated). To be performed by a qualified person only.
The VFD fan won’t come on. If there is no power, check
circuit breaker. Check for no continuity across transorb
(located at wire terminal strip). If the power is good,
replace the fan.
There is no water flow through heat exchanger. Make
sure both ball valves are open.
Water is leaking at the heat exchanger. Repair or replace
the coil.