IMPULSE•G+/VG+ Series 4 Technical Manual
November 2022
Page 23
2.7 VFD Derating
2.7.1 Temperature Derating
To ensure the maximum performance life, the VFD output current must be derated when it is installed in areas with
high ambient temperature or if VFDs are mounted side-by-side in a cabinet. In order to ensure reliable VFD
overload protection, set parameters L08-12 and L08-35 according to the installation conditions.
Figure 2-5: Ambient Temperature and Installation Method Derating
2.7.1.1
IP00/Open-Chassis Enclosure
An ambient temperature between -10°C to +60°C (14°F to 140°F) allows continuous and fully loaded operation
without derating.
2.7.1.2
Side-by-Side Mounting
An ambient temperature between -10°C and 30°C (14°F to 86°F) allows continuous and fully loaded operation
without derating. Operation between 30°C and 50°C (86°F to 122°F) requires output current derating.
2.7.2 Altitude Derating
The VFD output current must be derated when it is installed in altitudes above 1000 meters and up to a maximum
of 3000 meters. Derate 1% for every 100 m above 1000 m.
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