Data Sheet

QT20.241, QT20.241-C1
Q-Series
24V, 20A, THREE PHASE INPUT
Apr. 2017 / Rev. 2.1 DS-QT20.241-EN
9. EFFICIENCY AND POWER LOSSES
3AC 400V 3AC 480V
Efficiency typ. 95.0% 94.8% At 24V, 20A
Average efficiency
*)
typ. 94.2% 93.6% 25% at 5A, 25% at 10A, 25% at 15A and
25% at 20A
Power losses typ. 8.2W 10.0W At 24V, 0A (no load)
typ. 14.5W 16.0W At 24V, 10A (half load)
typ. 25.3W 26.4W At 24V, 20A (full load)
*) 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.
Fig. 9-1 Efficiency vs. output current at 24V,
typ.
Fig. 9-2 Losses vs. output current at 24V, typ.
Efficiency
4 6 8 101214161820A
88
89
90
91
92
93
Output Current
94
95
96%
(
b
)
(
a
)
(a) 3x 400Vac
(b) 3x 480Vac
Power Losses
02468101214 20A
0
5
10
15
20
25
30W
16 18
(
b
)
(
a
)
(a) 3x 400Vac
(b) 3x 480Vac
Output Current
Fig. 9-3 Efficiency vs. input voltage at 24V,
20A, typ.
Fig. 9-4 Losses vs. input voltage at 24V, 20A,
typ.
Efficiency
9/27
350 400
450
500 3x550Vac
94.2
94.4
94.6
94.8
Input Voltage
95.0
95.2
95.4%
Power Losses
350 400
450
500 3x550Vac
24.0
24.5
25.0
25.5
Input Voltage
26.0
26.5
27W
All parameters are typical values specified at 24V, 20A, 3x 400Vac, 50Hz, symmetrical mains voltages, 25°C ambient and after
a 5 minutes run-in time unless otherwise noted.
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