Chapter 8 Specifications | VFD-ED
Altitude Derating Curve
Condition Operating Environment
High Altitude
If the AC motor drive is installed at an altitude of 0–1000 m, follow normal
operation restrictions. For altitudes of 1000–3000 m, decrease the drive’s rated
current by 1% or lower the temperature by 0.5°C for every 100 m increase in
altitude. The maximum altitude for corner grounding is 3000 m. If installing at an
altitude higher than 3000 m is required, contact Delta for more information.
Table 8-6
Figure 8-2
The rated output current derating (%) for different altitudes above sea level:
Altitude above Sea Level (Meter) 0 1000 1500 2000 2500 3000
Output Current / Rated Current (%) 100 100 95 90 85 80
Table 8-7
70
75
80
85
90
95
100
105
0 500 1000 1500 2000 2500 3000
Drive's Output Current Rating (%)
Altitude (Meter)
Derating for High Altitude
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