8 Additional information
BU 0500 GB Subject to technical alterations 151
8.5.2 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.
230V devices: Reduced overload capacity (approx.) due to pulse frequency (P504) and time
Time [s]
Pulse frequency [kHz]
> 600 60 30 20 10 3.5
3...8 110% 150% 170% 180% 180% 200%
10 103% 140% 155% 165% 165% 180%
12 96% 130% 145% 155% 155% 160%
14 90% 120% 135% 145% 145% 150%
16 82% 110% 125% 135% 135% 140%
400V devices: Reduced overload capacity (approx.) due to pulse frequency (P504) and time
Time [s]
Pulse frequency [kHz]
> 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%
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