Figure 9: Characteristic Of The Current Limit In Relation To The Time - KEB COMBIVERT F6 Programming Manual

Protection functions
4.4.2.4 OL2 protection
Protection against the error OL2 can be activated via object
mode
is14 overload protect mode
Value Name
0 off
on, limit =
1
is21
on, limit vari-
2
able
The permissible total current is limited in mode 2 only if the OL2 counter exceeds a
certain value.
21
1

Figure 9: Characteristic of the current limit in relation to the time

Characteristic of the current limit in relation to the time when operating at the cur-
rent limit for different values of
steeper the descent of the current limit when the OL2 counter reaches the safety
factor.
© 2022 KEB Automation KG
for current controlled operation. There are two different modes:
Note
No protection against OL2 tripping, but overload reserves can be fully usable
The permissible total current is limited according to the OL2 limiting characteristic.
The permissible percentage of the OL2 current, to which the current setpoint is
limited, must be adjusted in
The most stable OL2 protection is achieved with this function, provided the safety
distance to OL2 is selected not too small. No short-term overload reserves are
available in the lower frequency range. In the whole frequency range the current
is limited to
Imax = (de29 inverter maximum current * is21 OL2 safety
The current is not limited initially if there is sufficient distance between OL2 coun-
ter and is21 OL2 safety
The current limit is reduced to the OL2 limit characteristic value only when the
OL2 counter reaches the value of is21.
An OL2 error can rather occur in this mode caused by too high factor
prot. gain or too high value for
available for a short period.
Permanently the current in the whole frequency range is also limited to
verter maximum current * is21 OL2 safety
160
140
120
100
80
60
Stromgrenze (Faktor = 25)
Stromgrenze (Faktor = 100)
40
OL2 Counter bei Betrieb an der Stromgrenze
I OL2
20
SafetyFact (is21) * I OL2
0
1fghfh
is20 OL2 prot
is21 OL2 safety fact.
fact..
OL2 safety fact.. Therefore overload reserves are
fact.
Zeit
gain. The higher the factor, the
is14 overload protect
0x350E
fact).
is20 OL2
de29 in-
61