ABB ACS550 Series, Руководство пользователя

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262 ACS550 User’s Manual
Technical data
Derating
The load capacity (current and power) decreases for certain situations, as defined
below. In such situations, where full motor power is required, oversize the drive so
that the derated value provides sufficient capacity.
For example, if your application requires 15.4 A of motor current and a 8 kHz
switching frequency, calculate the appropriate drive size requirement as follows:
The minimum size required = 15.4 A / 0.80 = 19.25 A
Where: 0.80 is the derating for 8 kHz switching frequency (see section
Switching frequency derating
on page 262 ).
Referring to I
2N
in the ratings tables (starting from page 259 ), the following drives
exceed the I
2N
requirement of 19.25 A: ACS550-x1-023A-4, or ACS550-x1-024A-2.
Temperature derating
In the temperature range +40 °C
…
50 °C (+104 °F
…
122 °F), the rated output current
is decreased 1% for every 1 °C (1.8 °F) above +40 °C (+104 °F). Calculate the
output current 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 × 10 °C
=
90% or 0.90.
The output current is then 0.90 × I
2N
or 0.90 × I
2hd
.
Altitude derating
In altitudes 1000
…
4000 m (3300
…
13,200 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 distributor or office for further information.
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
When using the 8 kHz switching frequency (parameter 2606), either:
• Derate P
N
/ P
hd
and I
2N
/ I
2hd
to 80% or
• Set parameter 2607
SWITCH FREQ CTRL
= 1 (
ON
) which allows the drive to reduce
the switching frequency if/when the drive’s internal temperature exceeds 90 °C.
See the parameter description for 2607 for details.
When using the 12 kHz switching frequency (parameter 2606), either:
• Derate P
N
/ P
hd
and I
2N
/ I
2hd
to 65% (to 50% for 600 V, R4 frame sizes, that is for
ACS550-U1-032A-6 … ACS550-U1-062A-6),
and derate ambient temperature maximum to 30 °C (86 °F),
and note that the current is limited to a maximum value of
I
2hd
, or
• Set parameter 2607
SWITCH FREQ CTRL
= 1 (
ON
) which allows the drive to reduce
the switching frequency if/when the drive’s internal temperature exceeds 80 °C.
See the parameter description for 2607 for details.