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Example 1, IEC: How to calculate the derated current
The drive type is ACH480-04-018A-4, which has a nominal output current (
I
N
) of 17 A
at 400 V. Calculate the derated output current at 4 kHz switching frequency, at 1500 m
altitude and at 55 °C surrounding air temperature.
Switching frequency derating: Derating is not necessary at 4 kHz.
Altitude derating: The derating factor for 1500 m is
Surrounding air temperature derating: The derating factor for 55 °C surrounding air
temperature is
Multiply the nominal drive output current by all the applicable derating factors. In this
example, the derated output current becomes
Example 1, UL (NEC): How to calculate the derated current
The drive type is ACH480-04-014A-4, which has nominal output current (
I
N
) of 14 A at
480 V. Calculate the derated output current at 4 kHz switching frequency, at 6000 ft
altitude and at 131 °F surrounding air temperature.
Switching frequency derating: Derating is not necessary at 4 kHz.
Altitude derating: The derating factor for 6000 ft is
Surrounding air temperature derating: The derating factor for 131 °F surrounding air
temperature is
Multiply the nominal drive output current by all the applicable derating factors. In this
example, the derated output current becomes
Example 2, IEC: How to calculate the required drive
The application requires a nominal motor current of 6.0 A at a switching frequency of
8 kHz. The supply voltage is 400 V, the altitude is 1800 m and the surrounding air
temperature is 35 °C.
126 Technical data
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 ...