Delta MH300 Series User Manual

Chapter 9 Specification
MH300
9-10
9-6 Derating for Ambient Temperature and Altitude
 For more information on calculation for derating curve, refer to Pr.06-55.
 When choosing the correct model, consider factors such as ambient temperature, altitude, carrier
frequency, control mode, and so on.
That is, Actual rated current for application (A) = Rated output current (A) x Ambient temp. rated
derating (%) x Altitude rated derating (%) x [Normal / Advanced control] carrier frequency rated
derating (%)
Protection Level
Operating Environment
IP20 / UL Open Type
If the AC motor drive operates at the rated current, the ambient temperature
needs to be between -20–50°C. If the temperature is above 50°C, decrease
2.5% of the rated current for every 1°C increase in temperature. The
maximum allowable temperature is 60°C.
IP40 / NEMA1 / UL Type 1
If the AC motor drive operates at the rated current, the ambient temperature
needs to be between -20–40°C. If the temperature is above 40°C, decrease
2.5% of the rated current for every 1°C increase in temperature. The
maximum allowable temperature is 60°C.
Table 9-9
Ambient temperature derating curve
Fig. 9-1
IP20 / U
L Open Type:
The rated output current derating (%) in normal duty / heavy duty when carrier frequency is the default
value:
Ambient temperature (Ta) /
100% load
Carrier
frequency (kHz)
30 35 40 45 50 55 60
Default
100
100
100
100
100
87
75
Table 9-10
IP40 / NEMA 1 / UL Type 1:
The rated output current derating (%) in normal duty / heavy duty when carrier frequency is the default
value:
Ambient temperature (Ta) /
100% load
Carrier
frequency (kHz)
30 35 40 45 50 55 60
Default
100
100
100
87
75
63
50
Table 9-11

Delta MH300 Series Specifications

General

Brand	Delta
Model	MH300 Series
Category	DC Drives
Language	English