Reference Manual Instruction Manual

All parameters are specified at 24V, 2.5A, 230Vac input, 25ªC ambient and after a 5 minutes run-in time unless noted otherwise.
Rockwell Automation Publication 1606-RM032A-EN-P — April 2014 11
Bulletin 1606 Switched Mode Power Supplies
12. Efciency and Power Losses
Efciencies for 3-Phase operation:
3AC 400V 3AC 480V
Efciency typ. 95.4% 95.2% at 48V, 20A
Average efciency
*)
typ. 94.7% 94.6% 25% at 5A, 25% at 10A, 25% at 15A. 25% at
20A
Power losses typ. 1.5W 1.5W with activated shut-down
typ. 9.5W 9.8W at 48V, 0A (no load)
typ. 24.1W 25.0W at 48V, 10A (half load)
typ. 46.3W 48.4W at 48V, 20A (full load)
*) The average efciency 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.
Efciencies when using only 2 legs of a 3-phase system:
2AC 400V 2AC 480V
Efciency typ. 94.4%
**)
94.7%
**)
at 48V, 20A
Power losses typ. 56.9W
**)
53.7W
**)
at 48V, 20A (full load)
**) Curves can be found in section 25.4.
Fig. 12-1 Efciency vs. output current at 48V,
typ.
Fig. 12-2 Losses vs. output current at 48V,
typ.
Efciency
4 6 8 101214161820A
92
93
94
Output Current
95
96%
3x480Vac
3x400Vac
Power Losses
0 2 4 6 8 10 12 14 20A
10
0
30
40
50
60W
16 18
20
3x400Vac
3x480Vac
Output Current
Fig. 12-3 Efciency vs. input voltage at 48V,
20A, typ.
Fig. 12-4 Losses vs. input voltage at 48V, 20A,
typ.
Efciency
350 400
450
500 3x550Vac
94.9
95.0
95.1
95.2
Input Voltage
95.3
95.4
95.5%
Power Losses
350 400
450
500 3x550Vac
44
45
46
47
Input Voltage
48
49
50W