4.4 Protection functions
Errors and warnings are also triggered by the protection functions of the drive. The
function and parameterizing of the protection functions is described in the follow-
ing.
Overload (OL)
The monitoring of the continuous load of the inverter can be influenced via the fol-
lowing objects:
The OL function protects the inverter against permanent overload.
Depending on the cooling, the operation at higher switching frequencies or higher
DC link voltage, the error "ERROR overheat powmod.“ (overtemperature power
components) switches off the drive already before OL function response.
The OL function is a root mean square (RMS) function. Depending on the load pro-
file, the RMS value can be 100%, although the arithmetic mean value of the load is
significantly smaller.
In addition, the load is weighted more heavily for extreme overloads (graphic: high
overload range). This means that it is provided with a factor for calculating the
RMS value so that the overload protection function is triggered before the RMS
value reaches 100%.
If the cycle duration of a load cycle is significantly smaller than the overload times
for a constant load, it must also be observed that the OL counter always has to re-
turn to zero. The maximum utilization of an inverter can be reached, although the
OL counter reaches a maximum value of less than 5% percent.
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