Overload Characteristic (Ol); Figure 1: Switch-Off Time T Depending On The Overload I/In (Ol) - KEB COMBIVERT F6 Instructions For Use Manual

UNIT DATA OF THe 400V UNITS

3.2.3.1 Overload characteristic (OL)

All drive converters can be operated at rated switching frequency with an utilization of
150 % for 60 s.
Restrictions:
•
•
500
400
300
270
240
210
180
150
120
90
60
30
0
110
Legend
① Thermal overload limit
② Limitation by the software current limit (the limit can be set with parameter is35)
Figure 1: Switch-off time t depending on the overload I/IN (OL)
On exceeding a load of 105 % the overload integrator starts. When falling below the inte-
grator counts backwards. If the integrator achieves the overload characteristic „ERROR
overload (OL)" is triggered.
After a cooling down period, the integrator can be reset now. The drive converter must
remain switched on during the cooling down phase.
30
The thermal design of the heat sink is based on the rated current and the maximum
surrounding temperature. At high surrounding temperatures and/or high heat sink
temperatures (for example, by preceding utilization nearby 100%), the drive convert-
er can change to overtemperature 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 =>
Overload characteristic (OC Level 180 %)
①
120 130 140
Motor current / drive converter rated currrent / %
„Frequency-dependent maximum current
②
150 160 170
(OL2)".
180