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8.0 Advanced Adjustments
There are additional US parameters which can provide further functional adjustments
of the drive. These US parameters are all those greater than US.10. The following
will provide a basic description of the function of each parameter.
The E.OL2 function is designed to protect the inverter from dangerous currents when
operating at very low output frequencies. With some geared motors and mainly with
gearless motors the drive is forced to provide high currents at output frequencies
below 3 Hz. This causes considerable thermal loading on the power transistors. In
an attempt to protect itself the drive will monitor the load current when operating
below 3 Hz. If the safe value is exceeded, the drive will trigger the error E.OL2. See
section 2.7 for a table with the actual current values. A value of 0 in US.16 provides
this function.
A value of 16 takes into consideration the actual temperature of the power modules.
If the temperature is lower, the threshold level for the output current is raised allowing
more current to  ow before triggering the error.
A value of 64 will cause the drive to automatically lower the carrier frequency when
the output current reaches the E.OL2 limit. By doing so the actual threshold value
is raised preventing E.OL2 and the drive keeps running. It is possible that under
certain cases the carrier frequency might become low enough to be audible.
0 = Standard function E.OL2 at listed current values
16 = Heatsink temperature dependent E.OL2
64 = Auto carrier frequency reduction
80 = both temp dependent and auto carrier freq. reduction
US. 16
E.OL2 function
Advanced Parameters
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