18
Code Condition Potential Causes Proposed Action
OS
Over
Speed
EcoVFC operating
outside of range of
operating frequency
1. Press reset button to reset EcoVFC
2. Check for proper operation. If condition is still present,
power down unit completely and wait 30 seconds.
3. Turn on power and check for proper operation.
4. If fault re-occurs, replace EcoVFC
OC
Open
circuit
(from
EcoVFC to
motor)
(see note
below)
Connection broken from
EcoVFC to PMA
1. Push reset button on the EcoVFC.
2. If condition is corrected, check for proper operation of
system; if operating correctly, do not continue to next
step. If condition is still present continue to next step.
EcoVFC/PMA Connections
1. Disconnect power at load center, lock and tag circuit
breakers.
2. Remove the three motor control outputs from the
EcoVFC unit.
3. Using an ohmmeter on 200 Ω setting, place leads
between these three wires from the pump motor, this is
the rst step in determining where the open circuit has
occurred. Correct reading between any two of the three
wires should be 1.2 + / -1 ohms for a VS4 and 2.5 + / -1
ohms for a VS2.
4. Continue conductivity tests on the remaining
combinations of wires (3 total). Note results, e.g. Black
to red = 2 ohms. Readings between any of the three
motor control wires and ground should be an open
circuit. If readings in this step are incorrect go to Step
7; if readings are correct, contact FE Petro Technical
Support for assistance.
5. Go to the submerged turbine and remove the cover at
the top of the extractable manifold; remove the three
wire nuts.
6. Place an ohmmeter between the three wires leading to
the pump motor as above. If readings are incorrect go
to PMA replacement in 3 ashes section; if readings are
correct, there is problem with the wiring between the
EcoVFC and this point.
7. Remove the junction box cover and do conductivity
test on wires from junction box to extractable discharge
head. If wires are not conducting replace the male and
female connectors of the submerged turbine. If there is
no problem with these connections the wires from the
EcoVFC to the submerged turbine are suspect. Contact
an electrician to correct the problem.
8. After the problem has been corrected turn on power to
EcoVFC and verify system is operating correctly.
Note: In rare installations where motor wiring runs are extremely long and/or of a small wire diameter, a false
OC (open circuit) may be displayed on the EcoVFC. See the table of recommended maximum wire length
to wire gauge for submersible wiring in the beginning of this manual.
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