Eaton PowerXL DG1 - Temperature Deratings

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Appendix B—Installation guidelines
POWERXL SERIES VFD MN040002EN—February 2018 www.eaton.com
Temperature deratings
When using the PowerXL drives at elevated temperatures, derating is required to size the drive and
maintain proper cooling. The following procedures and tables describe the process ofderating and
choosing the correct drive.
Procedure
Certain operating parameters and conditions are required for correct derating. These are: voltage, torque
application (variable or constant), operating temperature, enclosure rating, switching frequency, required
amperage.
Follow the below steps to correctly derate the PowerXL drives.
1. Find the derating table (Table 46–Table 51) for the voltage and torque application.
ex.) 480 V, Variable Torque = Table 8
2. Within the table, find the sections of rows for the application temperature and column for the
switching frequency.
ex.) 50 °C section, 4 kHz column
3. Look at all the frame sizes and find the frame size for your required amperage.
ex.) FR1 = 9 A
FR2 = 25 A
FR3 = 51.8 A @ this is the frame size needed for the 37 A application
FR4 = 89.9 A
FR5 = 66.1 A
4. Take the derating % for that frame size and go to the catalog tables (Table 2–Table 7).
Derate each option within that frame size to find the correct drive.
ex.) the derating percentage is 84.9%
DG1-34031FB-C21C: normal 38 A, derated to 84.9% = 32.3 A
DG1-34038FB-C21C: normal 46 A. derated to 84.9% = 39.1 A @ this is the drive to select
DG1-34046FB-C21C: normal 61 A, derated to 84.9% = 51.8 A