Nord Drivesystems NORDAC LINK SK250E-FDS, Руководство пользователя

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NORDAC LINK (SK 250E-FDS ... SK 280E-FDS) – Users Manual for Frequency Inverters as Field Distributors
190 BU 0250 en-3021
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8.4.2 Reduced overcurrent due to time
The possible overload capacity changes depending on the duration of an overload. Several values are
cited in this table. If one of these limiting values is reached, the frequency inverter must have sufficient
time (with low utilisation or without load) in order to regenerate itself.
If operated repeatedly in the overload region at short intervals, the limiting values stated in the tables
are reduced.
400V devices: Reduced overload capacity (approx.) due to pulse frequency (P504) and time
Pulse frequency
[kHz]
Time [s]
> 600 60 30 20 10 3.5
3...6 110 % 150 % 170 % 180 % 180 % 200 %
8 100 % 135 % 150 % 160 % 160 % 165 %
10 90 % 120 % 135 % 145 % 145 % 150 %
12 78 % 105 % 120 % 125 % 125 % 130 %
14 67 % 92 % 104 % 110 % 110 % 115 %
16 57 % 77 % 87 % 92 % 92 % 100 %
Table 8: Overcurrent relative to time
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