VFD66 User Guide 21
Issue Number: 2 www.johnsoncontrols.com
Safety information Rating data
Mechanical
installation
Electrical
installation
De-rating
Keypad and
display
Parameters Diagnostics
Technical
specifications
UL Listing
5 De-rating
5.1 De-rating information
Figure 5-1 200/230 Vac Temperature De-Rating
No de-rating for 400/460 Vac drives up to 60°C (140°F). Contact JCI application
engineering for 6KHz and 12KHz versions
De-Rating examples
For these examples, the drive used is a VFD66EBA type. See Figure 5-1 and Table 5-1.
• If the VFD66EBA drive is used in Denver, Colorado (altitude 5200 ft), the output
rating is reduced (see Table 5-1). When the temperature is less than 122°F (50°C),
the VFD66EBA drive is rated for 9.96 amperes, as shown by the equation:
De-Rated maximum output amperes = 10.6 A x 0.94 = 9.96 amperes
• If the VFD66EBA drive is used in Denver, Colorado (altitude 5200 ft) and the
ambient temperature reaches 140°F (60°C), then the VFD66EBA drive is de-rated
to maximum current of 9.0 amperes due to the high ambient temperature and is
further de-rated to 8.46 amperes because of the high altitude.
De-Rated maximum output amperes = 9.0 amperes x 0.94 = 8.46 amperes.
Amps
12
10
8
6
4
2
104 F° 122 F°
This is the de-rating with the switching frequency at 3kHz.
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