Derating
Ambient Temperature Derating
If the inverter ambient temperature is higher than 45°C, an output current derating like shown in
Fig 9.1
must
be considered.
10 0
8 0
6 0
4 0
2 0
0
0 10 2 0 3 0 4 0
Temperature (°C)
50 6 0
Fig 9.1 Ambient Temperature Derating
9
Carrier Frequency Derating
If the carrier frequency is set higher than the factory default value, an output current derating like shown in
Fig 9.2
must be considered
Output current (%)
100% Rated Current
3 minutes 50% ED
125%
200V Class 22kW or less
400V Class 22kW or less
100%
75%
200V Class 30 to 55kW
400V Class 30 to 55kW
Carrier frequency
0
2 5 8 10 15
Fig 9.2 Carrier Frequency Derating
(kHz)
9-
6
Altitude Derating
The standard inverter specification is valid for altitudes up to 1000m above sea level. If the inverter is used in regions with higher altitude, the allowable input voltage, output current and ambient temperature are derated as shown below.
Altitude
1000 m or less
1000 to 2000 m
2000 to 3000 m
Table 9.4 Altitude derating
Input Voltage
100%
Output Current
100%
90% of standard spec.
80% of standard spec.
90% of standard spec.
80% of standard spec.
Max. Ambient Temperature
100%
95% of standard spec.
90% of standard spec.
IMPORTANT
The maximum altitude is 3000m above sea level.
Example
The following example shows the derating of a 400V, 7.5 kW, inverter (L7Z47P5)
Altitude
1000 m or less
1000 to 2000 m
2000 to 3000 m
Table 9.5 Altitude derating example
Input Voltage
480 VAC or less
Output Current
18 A or less
432 VAC or less
384 VAC or less
16.2 A or less
14.4 A or less
Ambient Temperature
-10 to 45 °C
-10 to 43 °C
-10 to 41 °C
9
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