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Protection functions

3.6.1.4 Overload

The overload protection is a function that triggers an error for which, however, a pre-warning can be generated.

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 over temperature

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.

Thestatuschangesafteracoolingperiodfrom"Error!Overtemperature"to"36:Heatsinktemperaturenormal

"(E.nOH) and is then 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 COMBIVERT is protected against malfunctions due to high interior temperatures.

Uponexceedingaunit-specic(warning)temperaturetheinteriorfanisactivated.Iftheinteriortemperatureis

still too high after 10 minutes, the response adjusted with Pn.16 is triggered. The reaction when decreasing the

limit value is depending on the adjusted response in Pn.16.

Onexceedingtheunit-specic(error)temperaturethedelaytimeadjustedinPn.17isactivated.Iftheinterior

temperature is still too high after this period, E.OHI is triggered. If the interior temperature decreases again

below the limit value, it is switched to E.nOHI. Now the reset is possible.

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dened.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.

3.6.1.7 Bus error

The COMBIVERT contains two watchdogs that monitor the communication between an external bus, the oper-

KEB COMBIVERT R6-N User Manual

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