Danfoss DLX 4.6 Guia do Utilizador descarregar pdf (Página 50)

50 User Guide DLX Series L00410623-1

5.3.3. Frequency Monitoring

The inverter repeats the test sequence, but now with the frequency trip limits. First, the

upper frequency trip level is ramped down from the maximum allowed frequency level,

and decreased until it equals the current grid frequency. The time it takes from

equalization to disconnection is measured.

AC max

Maximum allowed frequency; trip level

AC off

Disconnection frequency level; equalization

max

Maximum allowed disconnection time

off

ime from equalization to disconnection

PASS

he third sequence is successfully carried out

FAIL

he third sequence has failed – try again later

Second, the under frequency monitoring is checked. The trip level is ramped up from the

minimum allowed frequency level, and increased until it equals the current grid frequency.

The time it takes from equalization to disconnection is measured.

AC min

Minimum allowed frequency; trip level

AC off

Disconnection frequency level; equalization

max

Maximum allowed disconnection time

off

ime from equalization to disconnection

PASS

he fourth sequence is successfully carried out

FAIL

he fourth sequence has failed – try again later

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Danfoss DLX 4.6 Guia do Utilizador Página 50