Alarm Description Possible solutions
A01 Overcurrent motor The current absorbed by the motor ex-
ceeds the value set in the parameter
Rated motor current.
Reset mode:
• Automatic reset after 10 seconds for
up to 7 attempts, after which you
must wait for 60 minutes.
• Disconnecting the power supply.
• Verify that the value set for the parameter Rated motor current cor-
responds at least to the rated current of the motor according to its
rating plate data.
NOTE
The voltage drop across the inverter (variable be-
tween 20 and 40 VAC) causes the motor to be
powered at a slightly lower voltage than the one
stated on the data plate. The current absorbed
by the motor could therefore be slightly higher
than the rated current indicated in data plate and,
to obtain maximum performance, it is necessary
to increase the parameter Rated motor current
between 5% and 10%.
WARNING
Check with the motor manufacturer the tolerability
to withstand a current greater than its rated cur-
rent.
• Check that all the motor phases are correctly connected and that the
connection is suitably configured in Star or Delta.
• Check that motor parameters are correctly set.
• In devices with FOC control, perform a new motor calibration.
• In the presence of output filters (dV / dt or sinusoidal), check that
they are correctly connected and, in devices with FOC control,
check that you have correctly set the parameters PWM and FOC
dynamics in relation to the length of the motor cable and the type of
filter used.
• Check that the pump is turning in the correct direction.
• Make sure that the motor is free to rotate and check for any me-
chanical issues.
• Adjust parameter Voltage boost
A02 Sensor fault The current value read by the analog
input is less than 4 mA.
Reset mode:
• Alarm reset by STOP key.
• Disconnecting the power supply
• Check that the connections on the device side and on the sensor
side are correct.
• Check that the sensor is fed the correct power.
• Check that the sensor is working properly.
• If only one sensor is connected to analog input 1, try to connect it to
analog input 2.
A03 Over temperature
inverter
The temperature reached by the device
is higher than the maximum allowed
value.
Reset mode:
• Automatic reset
• Check that the ambient temperature is within the allowed limits.
• Make sure the device is protected from direct exposure to sunlight
or heat sources.
• Check that both the external and internal cooling fans (if present)
are working properly.
• Check that the dissipation channels are clean.
• Check that the device is cooled as indicated in the dedicated chap-
ter.
• Reduce parameter PWM as much as possible.
NOTE
To ensure uninterrupted operation, the inverter au-
tomatically reduces the maximum frequency (i.e.
power) when the internal temperature reaches a
certain threshold. If such frequency reduction is
not sufficient to keep the temperature above the
maximum permitted value, the inverter will stop the
motor and trigger the alarm A03 Over temperature
inverter.
A04 Dry run cosphi The warning W26 No water appeared
5 consecutive times following the auto-
matic reset attempts.
Reset mode:
• Alarm reset by STOP key.
• Disconnecting the power supply
WARNING
When the warning W26 No water appears, the de-
vice will automatically restart the load after a time
equal to the value set in the parameter Restarts
delay multiplied by the number of attempts made.
At the end of the fifth attempt, the device will defini-
tively stop the load producing the alarm A04 Dry run
cosphi. The alarm must be reset manually.
MIDA
45
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