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Altitude derating: The derating factor for 1800 m is
.
Surrounding air temperature derating: Derating is not necessary at 35 °C surrounding
air temperature.
To see if the derated output current of a drive is sufficient for the application, multiply
the nominal output current (
I
N
) by all the applicable derating factors. For example, drive
type ACH480-04-12A7-4 has a nominal output current of 12.6 A at 400 V. The switching
frequency derating factor for this drive type is 0.68 at 8 kHz. Calculate the derated drive
output current:
In this example, the derated output current is sufficient, because it is more than the
required current.
Example 2, UL (NEC): How to calculate the required drive
The application requires a maximum of 12.0 A of motor current with a 10% overload for
one minute every ten minutes (
I
Ld
) at a switching frequency of 8 kHz. The supply voltage
is 480 V, the altitude is 5500 ft and the surrounding air temperature is 95 °F.
Altitude derating: The derating factor for 5500 ft is
.
Surrounding air temperature derating: Derating is not necessary at 95 °F surrounding
air temperature.
To see if the derated output current of a drive is sufficient for the application, multiply
the drive output current for light-duty use (
I
Ld
) by all the applicable derating factors. For
example, drive type ACH480-04-21A-4 has an output current of 21 A at 480 V. The
switching frequency derating for this drive type is 0.67 at 8 kHz. Calculate the derated
drive output current:
In this example, the derated output current is sufficient, because it is more than the
required current.
Technical data 127
Summary of Contents for ACH480
Page 1: ... ABB DRIVES FOR HVAC ACH480 drives Hardware manual ...
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Page 156: ...Frame R1 Frame R1 front side IP20 UL open type 156 Dimension drawings ...
Page 157: ... Frame R1 bottom rear IP20 UL open type Dimension drawings 157 ...
Page 158: ... Frame R1 front side UL Type 1 kit installed 158 Dimension drawings ...
Page 159: ... Frame R1 bottom rear UL Type 1 kit installed Dimension drawings 159 ...
Page 160: ...Frame R2 Frame R2 front side IP20 UL open type 160 Dimension drawings ...
Page 161: ... Frame R2 bottom rear IP20 UL open type Dimension drawings 161 ...
Page 162: ... Frame R2 front side UL Type 1 kit installed 162 Dimension drawings ...
Page 163: ... Frame R2 bottom rear UL Type 1 kit installed Dimension drawings 163 ...
Page 164: ...Frame R3 Frame R3 front side IP20 UL open type 164 Dimension drawings ...
Page 165: ... Frame R3 bottom rear IP20 UL open type Dimension drawings 165 ...
Page 166: ... Frame R3 front side UL Type 1 kit installed 166 Dimension drawings ...
Page 167: ... Frame R3 bottom rear UL Type 1 kit installed Dimension drawings 167 ...
Page 168: ...Frame R4 Frame R4 front side IP20 UL open type 168 Dimension drawings ...
Page 169: ... Frame R4 bottom rear IP20 UL open type Dimension drawings 169 ...
Page 170: ... Frame R4 front side UL Type 1 kit installed 170 Dimension drawings ...
Page 171: ... Frame R4 bottom rear UL Type 1 kit installed Dimension drawings 171 ...
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Page 198: ... Declaration of conformity 198 The Safe torque off function ...
Page 206: ...Dimensions 206 BIO 01 I O extension module ...
Page 212: ...Dimensions 3AXD50000031148 rev A 212 BREL 01 relay output extension module ...