Reduced Output Current Due To Mains Voltage; Figure 18: Output Current Due To Mains Voltage; Table 41: Overcurrent Relative To Pulse And Output Frequency - nord NORDAC PRO SK 500E Series User Manual

SK 54xE – Users Manual for Frequency Inverters
230V devices: Reduced overload capacity (approx.) due to pulse frequency (P504) and output frequency
Pulse frequency [kHz]
3...8
10
12
14
16
400V devices: Reduced overload capacity (approx.) due to pulse frequency (P504) and output frequency
Pulse frequency [kHz]
3...6
8
10
12
14
16

Table 41: Overcurrent relative to pulse and output frequency

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8.4.4

Reduced output current due to mains voltage

The devices are designed with thermal characteristics according to the nominal output currents.
Accordingly, for lower mains voltages, higher currents cannot be taken off in order to maintain the
stated power constant. For mains voltages above 400 V there is a reduction of the permissible
continuous output current, which is inversely proportional to the mains voltage, in order to compensate
for the increased switching losses.
I / I
N
1.2
1.2
1.1
1
0.9
k Unetz Unetz ( )
0.8
0.7
0.6
0.5
0.4
0.4
320
320

Figure 18: Output current due to mains voltage

200
Output frequency [Hz]
4.5 3.0
200% 170%
180% 153%
160% 136%
150% 127%
140% 119%
Output frequency [Hz]
4.5 3.0
200% 170%
165% 140%
150% 127%
130% 110%
115% 97%
100% 85%
340 360 380
2.0 1.5 1.0
150% 140% 130%
135% 126% 117%
120% 112% 104%
112% 105% 97%
105% 98% 91%
2.0 1.5 1.0
150% 140% 130%
123% 115% 107%
112% 105% 97%
97% 91% 84%
86% 80% 74%
75% 70% 65%
400 420
Unetz
0.5 0
120% 110%
108% 100%
96% 95%
90% 90%
84% 85%
0.5 0
120% 110%
99% 90%
90% 82%
78% 71%
69% 63%
60% 55%
440 460 480
Mains voltage [V]
480
BU 0505 EN-3021