Overload; Inverter Overtemperature; External Fault - KEB COMBIVERT R6-S Applications Manual

3.6.1.4 Overload

The overload protection is a function that triggers an error for which, however, a pre-warning can be genera-
ted.
With Pn.09 „Overload warning level" a value between 0...100 % can be adjusted, when the „Warning! Over-
load" or the „Warning! Overload during standstill" is set. The response to the overload warning is set with Pn.08
„overload warning response".
Overload (OL)
The implementation of the general overload protection is described in chapter 6.1.7 „Overload characteristics".
If the 100% load factor of the COMBIVERT is exceeded by 5 %, the internal overload counter starts to count
forward. If the load factor falls below 100 %, the counter counts backward. The current counter content can
be read in parameter ru.39. Upon reaching 100 % the inverter switches off with error message „E.OL" and the
counter counts backward. If it reaches 0 %, the status changes to E.nOL and the error can be reset.

3.6.1.5 Inverter overtemperature

Heat sink overtemperature
The heat sink temperature acquisition protects the power module from thermal overload. The temperature
when the COMBIVERT switches off with error message „8: Error! Overtemperature" (E.OH) depends on the
power unit.
After cooling period the status changes from „Error! Overtemperature" to „36: Heat sink temperature normal
again" (E.nOH) and is therefore resettable.
With Pn.11 „Heat sink overtemperature warning level" a level of between 0° C and 90° C can be set, at which
the pre-warning is triggered. The response to the warning message is set with Pn.10 „Heat sink overtempera-
ture response".
Internal overtemperature
The interior temperature monitoring protects the COMBIVERT against malfunctions caused by too high tempe-
rature in the interior of the converter. Upon exceeding a unit-specific temperature the interior fan is activated. If
the temperature is still too high after about 10 min., the disconnecting time set with Pn.17 „internal overtempe-
rature disconnecting time" (0...120s) starts.
With the start of the disconnecting time, switching condition „11: Warning internal overheating" is met and the
response to the warning message set in Pn.16 „internal overtemperature response" is executed.
After expiration of the disconnecting time, „6: Error! Overtemperature interior" (E.OHI) is triggered.
When the interior temperature has dropped again, the status changes again to „7: interior temperature back to
normal" (E.nOHI). The error can now be reset.

3.6.1.6 External fault

With Pn.04 „Input selection external fault", one or more digital inputs can be programmed which can trigger the
error „31: Error! External input" (E.EF).
With Pn.03 „Response to external error", the response of the inverter to the digital input is defined. With Bit 1
„2: Pn.04 = E.UP", the function of Pn.04 can be changed and the triggering of an error via a digital input can
be deactivated.
© KEB, 2008-02 COMBIVERT R6-S
Protective functions
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