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System Troubleshooting - Major Fault - “VFD off or Faulted”
This fault can indicate that the
VFD (variable frequency drive) is
not receiving power, has power
and is faulting due to a problem
with it not sending a signal
through R1 & R2,a problem with
the pump motor, or has failed
meaning it is being powered but
is not displaying anything and is
non-operational. the fault will clear
automatically if possible. Touch
the yellow fault box to display the
text in the lower box.
The control box door must be
opened to gain access to the
VFD. There is a way to defeat
the main disconnect and leave
the power on to the internals
of the control box but this must
only be attempted by a factory
trained technician. High Voltage is
present inside the control box.
Look at the VFD. If the diplay is
on and showing an F### note
which numbers are showing on
the fault, and press the red stop
button. This should clear the fault
and the system will start the pump
on its own. If there is no display
verify there is power going to the
VFD by checking the bottom side
of the three phase breaker. If
there is the correct voltage going
to it and no display showing, the
VFD has failed and needs to be
replaced. If there is no voltage
to it, check the top side of the
breaker for power and follow it
through the disconnect and back
to the breaker panel.
Troubleshooting Tips:
1. Verify all 3 legs are present to ground and leg-to-leg during
voltage checks. If all are present and the VFD has no display -
the VFD has failed.
2. If attempting to start the system and the pump simply won’t
start - turn off the 3 phase breaker and check the electrical
connections (wire nuts) on the pump’s access box.
3. If the VFD has voltage & the display shows 0 hertz.
Disconnect the wiring going to the pump from the VFD and
simulate starting the system. If the display jumps to normal
recirculation frequency display of 39.9Hz - suspect a bad
motor. (assuming the wiring was checked in step 2).
Summary of Contents for PURWATER RECLAIM 3.0
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