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Protective functions

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-specic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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.

KEB combivert R6-S Applications Manual

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