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12. Efficiency and Power Losses
Efficiencies for 3-Phase operation:
Efficiency
*)
Average efficiency
Power losses
*)
The average efficiency is an assumption for a typical application where the power supply is loaded with 25% of the nominal load for 25%
of the time, 50% of the nominal load for another 25% of the time, 75% of the nominal load for another 25% of the time and with 100%
of the nominal load for the rest of the time.
Efficiencies when using only 2 legs of a 3-phase system:
Efficiency
Power losses
**) Curves can be found in section 25.4.
Fig. 12-1 Efficiency vs. output current at 24V,
typ.
Efficiency
96%
95
94
93
Output Current
92
8
12 16
20
24
Fig. 12-3 Efficiency vs. input voltage at 24V,
40A, typ.
Efficiency
95.5%
95.4
95.3
95.2
95.1
95.0
Input Voltage
94.9
350
400
450
All parameters are specified at 24V, 40A, 3x400Vac, 25°C ambient and after a 5 minutes run-in time, unless noted otherwise.
3AC 400V
typ.
95.3%
typ.
94.7%
typ.
1.5W
typ.
9.5W
typ.
24.1W
typ.
47.3W
2AC 400V
typ.
94.4%
**)
typ.
56.9W
**)
3x400Vac
3x480Vac
28
32 36 40A
500 3x550Vac
Rockwell Automation Publication 1606-RM005A-EN-P - February 2014
3AC 480V
95.2%
at 24V, 40A
94.6%
25% at 10A, 25% at 20A, 25% at 30A. 25%
at 40A
1.5W
with activated shut-down
9.8W
at 24V, 0A (no load)
25.0W
at 24V, 20A (half load)
48.4W
at 24V, 40A (full load)
2AC 480V
94.7%
**)
at 24V, 40A
53.7W
**)
at 24V, 40A (full load)
Fig. 12-2 Losses vs. output current at 24V,
typ.
Power Losses
60W
50
40
30
20
10
Output Current
0
0
4
8 12 16 20 24 28
Fig. 12-4 Losses vs. input voltage at 24V, 40A,
typ.
Power Losses
50W
49
48
47
46
45
Input Voltage
44
350
400
450
Bulletin 1606 Switched Mode Power Supplies
3x480Vac
3x400Vac
32 36
40A
500 3x550Vac
11
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