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6.4.2 Derating curves
Although high switching frequencies allow for low running noise and faster
response times, they also produce higher losses at the power output stages,
as well as greater interference in the mains and motor cables. Because of
this, the switching frequency should be set to the lowest possible value.
In Expert mode (P1-14 = 101), the switching frequency can be changed in
parameter P2-22.
The temperature of the RASP5 increases at higher switching frequencies.
The output current (I
the ambient air temperature, when higher switching frequencies are used.
￫
If higher switching frequencies (>16 kHz) are required, the load
(output current) and/or the ambient temperature must be redu-
ced.
The following derating curves show the output current in continuous opera-
tion as a function of the switching frequency (f
ture.
6
RASP5 - 5...
l
e
5
[A]
RASP5 - 4...
4
3
RASP5 - 2...
2
1
0
0
5
10
15
Figure 85:
f
= 8 - 32 kHz with RASP5-2..., RASP5-4..., RASP5-5...
PWM
9
RASP5 - 8...
8
l
e
7
[A]
6
5
4
3
2
1
0
0
10
Figure 86:
f
= 4 - 32 kHz with RASP5-8...
PWM
Rapid Link 5 · RAMO5 · RASP5 05/20 MN034004EN www.eaton.com
) should therefore be reduced (derating) according to
2N
20
25
30
35
20
30
6 RASP5 speed controller
6.4 Specific technical data
) and ambient tempera-
PWM
40
45
50
55
ϑ [°C]
40
50
50
55
ϑ [°C]
8 kHz
12 kHz
16 kHz
24 kHz
32 kHz
4 kHz
8 kHz
12 kHz
16 kHz
24 kHz
32 kHz
141
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