FOXPOWER FULAGDA1512A, Руководство пользователя

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*The reason for the noise from transformer and/or case
When in inverter mode sometimes the transformer and/or case of the
inverter may vibrate and make noise. If the noise comes from transformer:
According to the characteristics of our inverter, there is one
type of load which most likely may cause rattles of
transformer.
That is a half wave load: A load that uses only half a cycle of
the power. This tends to cause an imbalance of the
magnetic field of the transformer, reducing its rated working
freq from 20KHz to, say, maybe 15KHz (it varies according to
different loads). In such a case the frequency of noise falls
exactly into the range (200Hz-20KHz) that human ears can
hear.
The most common load of such kind is a hair drier.
If the noise comes from the case:
Normally when loaded with inductive loads, the magnetic field generated
by the transformer keeps attracting or releasing the steel case at a specific
freq, this may also cause noise.
Reducing the load power or using an inverter with bigger capacity will
normally solve this problem.
The noise will not do any harm to the inverter or the loads.