ABB RCNA-01 Manual de usuario descargar pdf (Pagina 398)

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101

394 Technical data

ACH550-01 User's Manual

200 V drives

For 200 V drives, in the temperature range +40 °C…50 °C

(+104°F…122°F), the rated output current is decreased by 1%

for every 1 °C (1.8 °F) above +40 °C (+104 °F). The output

current is calculated by multiplying the current given in the rating

table by the derating factor.

Example: If the ambient temperature is 50 °C (+122 °F), the

derating factor is 100% - 1%/°C = 90% or 0.90.

The output current is then 0.90 · I

Altitude derating

In altitudes from 1000…2000 m (3300…6600 ft) above sea

level, the derating is 1% for every 100 m (330 ft). If the

installation site is higher than 2000 m (6600 ft) above sea level,

please contact your local ABB representative for further

information (see page 441).

Single phase supply derating

For 208…240 V series drives, a single phase supply can be

used. In that case, the derating is 50%.

Switching frequency derating

The switching frequency control (see parameter 2607 on page

234) can decrease the switching frequency instead of the

current when the drive reaches the internal temperature limit.

This function is on by default.

For worst case sizing, the maximum derating values are as

follows:

If the 8 kHz switching frequency is used, limit P

and I

to 80%.

If the 12 kHz switching frequency is used, limit P

and I

65%.

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