Chapter 9 SpecificationsMS300
189
9-7 Derating for Ambient Temperature, Altitude and Carrier Frequency
9-7-1 Derating Curve for Ambient Temperature and Altitude
If the AC motor drive operates at the rated current, the ambient temperature needs to be
between -20–50
o
C. If the temperature is above 50
o
C, decrease 2.5% of the rated current
for every 1
o
C increase in temperature. The maximum allowable temperature is 60
o
C.
If the AC motor drive operates at the rated current, the ambient temperature needs to be
between -20–40
o
C. If the temperature is above 40
o
C, decrease 2.5% of the rated current
for every 1
o
C increase in temperature. The maximum allowable temperature is 60
o
C.
If the AC motor drive is installed at an altitude of 0–1000 m, follow normal operation
restrictions. For altitudes of 1000–2000 m, decrease the drive’s rated current by 1% or
lower the temperature by 0.5
o
C for every 100 m increase in altitude. The maximum altitude
for corner grounded is 2000 m. If installing at an altitude higher than 2000 m is required,
contact Delta for more information.
Ambient Temperature Derating Curve
Figure 9-1
Figure 9-2
Ambient Temperature Derating for IP20 / UL Open Type
Ambient Temperature Derating for IP40 / NEMA 1 / UL Type 1
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