INVT GD100 - Page 8

Fault
code
Fault type Possible cause Solution
dEu Speed deviation fault
 The load is too heavy or stalled.  Check the load and increase the
detection time if the load is normal.
 Check whether control parameters
are set correctly.
STo Mal-adjustment fault
 SM control parameters are set
incorrectly.
 Autotuned parameters are not
accurate.
 The VFD is not connected to
the motor.
 Check the load and ensure the load
is normal.
 Check whether control parameters
are set correctly.
 Increase the maladjustment
detection time.
LL
Electronic
underload
 The VFD reports underload
pre-alarm according to the
setting.
 Check the load and underload
pre-alarm threshold.
PINV
PV reverse connection
fault
 PV wiring is incorrect.  Change the wiring direction of
positive and negative terminals, and
perform the wiring again.
PVOC PV overcurrent
 ACC or DEC is too fast.
 The power of the VFD is too low.
 The load transients or is
abnormal.
 There is to-ground short circuit
 Increase the ACC/DCC time.
 Select the VFD with larger power.
 Check if the load is short circuited
(to-ground short circuit of line-to-line
short circuit) or the rotation is not
smooth
PVOV PV overvoltage
 The solar cell panel input voltage
is too high.
 Model -4 is set as another
model.
 Reduce the number of solar cell
panels in series connection.
 Check and reset the model.
PVLV PV undervoltage
 The power of the solar cell panels
in series connection is too low or
it is cloudy and rainy weather.
 The starting current of the motor
is too high.
 Increase the number of solar cell
panels or perform the test in the
normal sunlight.
 Replace the motor.
E-422
Fault on 422
communication with the
boost module
 Communication cables are in
poor contact.
 Check four communication cables of
422 communication, ensuring that
they are connected reliably.
OV
Bus overvoltage
detected on the boost
side
 The sunlight changes sharply.  Adjust the boost PI parameters,
and enlarge the values of P19.07
and P19.08.
A-LS Weak-light pre-alarm
 The sunlight is weak or the
solar panel configuration
is insufficient.
 The device will automatically run
when the light is sufficient.
 Check whether the solar panel
configuration is sufficient.
A-LL Underload pre-alarm  The pumping pool has no water.  Check the pumping pool.
A-tF Full-water pre-alarm
 The pumping pool is full.  If you have configured the full-water
pre-alarm function, the device
automatically stops when the pre-
alarm elapsed. Otherwise, check
whether terminals are wired
correctly.
A-tL
Empty-water pre-
alarm
 The pumping pool has no water.  If you have configured the empty-
water pre-alarm function, the device
automatically stops when the pre-
alarm elapsed. Otherwise, check
whether terminals are wired
correctly.