Fagor DDS AXD/SPD 2.75 - Page 71

Power supplies
2.
Ref.1912
· 71 ·
DDS
HARDWARE
Derating depending on ambient temperature
The following graph shows the maximum rms current in continuous S1 (Pn)
and intermittent S6-40% (Pmax) duty cycles for a switching frequency of the
power transistors of 8 kHz in a temperature range between 5°C/41°F and
60°C/140°F. See the load cycles in the next section.
RPS-80. Power derating graph
RPS-75. Power derating graph
T. H2/25 Power derating on RPS-80 power supply (8 kHz).
Tª ambient
Pn
(power in S1)
PS6
(power in S6-40%)
in RPS mode in RPS mode in RB6 mode
°C °F kW kW kW
35 95 80.0 104.0 97.0
40 104 80.0 104.0 97.0
45 113 80.0 104.0 97.0
50 122 76.6 99.5 97.0
55 131 72.0 93.6 97.0
60 140 67.3 87.5 97.0
F. H2/27
Power derating on RPS-80 power supply for fc = 8 kHz.
T. H2/26 Power derating on RPS-75 power supply (8 kHz).
Tª ambient
Pn
(power in S1)
PS6
(power in S6-40%)
in RPS mode in RPS mode in RB6 mode
°C °F kW kW kW
35 95 75.0 97.5 97.0
40 104 75.0 97.5 97.0
45 113 75.0 97.5 97.0
50 122 71.1 92.5 97.0
55 131 67.1 87.2 97.0
60 140 63.0 81.9 97.0
F. H2/28
Power derating on RPS-75 power supply for fc = 8 kHz.
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