NORD Drivesystems BU0180 - Manual (Page 166)

SK 180E Manual for frequency inverters
166 Pre-series version BU 0180 GB-0914
9.4.2 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.
230 V 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...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%
400 V 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%