Overload Characteristic (Ol) For Peak Power Devices - KEB COMBIVERT F6 Series Instructions For Use Manual

DEVICE DATA OF THE PEAK POWER DEVICES

3.2.3.1 Overload characteristic (OL) for Peak Power devices

All drive controllers can be operated at rated switching frequency with an utilization of
150 % for 60s.
The OL overload function is a root mean square (RMS) function. The greater the differ-
ence between the overload and underload phases, the greater the deviation of the RMS
from the arithmetic mean value.
For extreme overloads (=>
OC level 230 %"
a factor for the calculation of the RMS value, by way that the overload protection function
triggers, even if the RMS value does not reach 100%.
Restrictions:
•
•
•
„Figure 3: Switch-off time t depending on the overload I/IN at
the load is weighted more heavily. This means the load is provided with
The thermal design of the heat sink is based on the rated operation. The following
values are taken into account: Rated output current, ambient temperature, 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 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
triggering the overload error OL and error OL2 can be triggered
(=>
„3.2.3.2 Frequency-dependent maximum current (OL2) for Peak Power devices").
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