KEB COMBIVERT F6 Series

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DEVICE DATA OF THE 400 V DEVICES
3.2.3.1 Overload characteristic (OL)
All drive controllers can be operated at rated switching frequency with an utilization of
150%for60s.
Restrictions:
• The thermal design of the heat sinks is based for rated operation. The following
values, among others, are taken into account: rated output current, ambient temper-
ature, rated switching frequency, rated voltage.
• At high ambient temperatures and/or high heat sink temperatures (for example, by
precedingutilizationnearby100%)thedrivecontrollercanchangetoovertempera-
ture error before triggering the protective function OL.
• At low output frequencies or switching frequencies higher than the rated switching
frequency, the frequency-dependent maximum current can be exceeded before
and error OL2 can be triggered => „3.2.3.2 Frequency-dependent maximum cur-
rent (OL2)“.
Motorcurrent/drivecontrollerratedcurrrent/%
0
30
60
90
120
150
180
210
240
270
300
110 120 130 140 150 160 170 180
400
500
①
②
Overloadcharacteristic(OClevel180%)
Release time / s
Legend
①
Thermal overload limit
②
Limitation by the software current limit (the limit can be set with parameter is35)
Figure 3: Switch-o time t depending on the overload I/IN at OC level 180% (OL)
• Onexceedingaloadof105%theoverloadintegratorstarts.
• When falling below the integrator counts backwards.
• If the integrator achieves the overload characteristic „ERROR overload (OL)“ is trig-
gered.
After a cooling down period, the integrator can be reset now. The drive controller must
remain switched on during the cooling down phase.