Italtecnica Nettuno 2.0 Manual De Instrucciones página 49

When the water flow is extremely low, the pump does not operate normally
The stop frequency is too high; try to lower the value to ensure more uniform operation also at low flow rates.
When the cocks are closed, the pump stops but restarts a few seconds later and there is no leakage from the
system
The "pump start-up DeltaP" value is too low; increase.
The expansion tank does not have the correct pre-load value; check.
The device often signals 'dry running'
The pump intake pipe drains when the system is not used for some time, thereby preventing it priming the next time
it is started. If there is a foot valve fitted, check its seal.
The dry running protection pressure value has not been set correctly; correct the value.
The device often signals 'high or low voltage'
The power supply voltage may not comply with the device specifications; have it checked by qualified personnel.
The device overheats and the over-temperature protection intervenes
The forced air cooling system on the heatsink fins may be blocked; check correct operation and condition
(cleanliness).
The switching frequency is too high for the power of the pump used; reduce the value.
The ambient temperature is too high for use of this device.
The pump turns at maximum speed but with poor performance
The connection of the pump is incorrect; check the electrical wiring.
The pump turns in the opposite direction; check the direction of rotation.
When more water is required by the system, the pressure drops
This is a normal condition which is due to the fact that the device is unable to force the pump beyond its capacity
curve. As a result, once a certain flow rate is exceeded, the pressure is no longer offset as the pump is already
running at the highest number of revolutions allowed. In these cases, a pump with higher performance levels should
be installed.
The pressure signal is not correct or the devices are not communicating correctly, or multiple masters are
present at the same time.
Some inverters connected on the serial bus may have the same address; check settings of the parameter "serial
address".
Check the serial connection between the devices.
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