Overvoltage; Table 4-1: Overvoltage Level; Table 4-2: Permanent Damage Due To Overvoltage - KEB COMBIVERT F6 Programming Manual

Protection functions

Overvoltage

The modulation is switched off with ERROR overpotential if (e.g.) in regenerative
operation the DC link of the inverter is charged too high by regeneration with too
fast ramp.
Regeneration is completed by deactivation and the inverter is protected.
One exception is (e.g.) excessively high charge of the DC link, which can occur
due to the EMF at high speed of a synchronous motor or voltage increase in an
asynchronous motor with preconnected filter.
If in these cases the DC link voltage is not limited to the "overpotential" value, ER-
ROR extreme overpotential is triggered with exceeding the next voltage limit.
Voltage class

Table 4-1: Overvoltage level

This error can only be reset after 60 seconds. In order to prevent additional energy
supply from the mains side, the inrush current limiting is reactivated, if the technol-
ogy of the inverter allows it.
If a voltage exceeds the "extreme overpotential" (OP2) value for a longer time, it is
assumed that the DC link capacitors are damaged and the inverter shall be made
subject to a service.
The error display changes to "ERROR capacitor damaged" and the device can not
be put into operation.
The internal switching power supplies are activated at mains voltage supply, but
the starting current limiting remains active and the inverter remains in "ERROR ca-
pacitor damaged".
This error is reset only with an overhaul by the service.
The following table shows the temporal connection between the duration of the
overvoltage and "ERROR capacitor damaged":

Table 4-2: Permanent damage due to overvoltage

82
230 V
400 V
690 V
DC voltage [V]
230V 400V
470 940
475 950
480 960
485 970
490 980
495 990
500 1000
505 1010
Tripping level ERROR
overpotential
400 V
840 V
1200 V
690V
1410
1425
1440
1455
1470
1485
1500
1515
Tripping level Error
extreme overpotential
470 V
940 V
1410 V
Permanent damage after
5 seconds
5 seconds
5 seconds
1.48 seconds
625 ms
320 ms
185 ms
117 ms
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