Altitude De-Rating - Johnson Controls VFD66 Drive User Manual

5.2

Altitude de-rating

See Table 5-1 for altitude multipliers. Use the following formula to determine the
adjusted rating:
Temperature De-Rated
Maximum Output Amperes
Table 5-1 Altitude multipliers
0-3300 ft (0-1000 m)
3300-4300 ft (1000-1305 m)
4300-5300 ft (1305-1610 m)
5300-6300 ft (1610-1915 m)
6300-7300 ft (1915-2220 m)
7300-8300 ft (2220-2525 m)
8300-9300 ft (2525-2830 m)
9300-9842 ft (2830-3000 m)
22
X
Multiplier
Altitude Range
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Altitude De-Rated Maximum
=
Output Amperes
Altitude Multiplier
1.0
0.97
0.94
0.91
0.88
0.86
0.83
0.80
VFD66 User Guide
Issue Number: 2