Protective functions
© KEB, 2012-10 COMBIVERT F5-A, -E, -H Page 7.13 - 7
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7.13.1.5 Inverter over temperature
Heat sink overtemperature
The heat sink temperature acquisition protects the power module from thermal overload. The temperature at
which the inverter switches off with error message "8: ERROR! Overtemperature" (E.OH) depends on the po-
wer circuit (generally 90°C).
After cooling period the status changes from "Error! Overtemperature" to "36: Heat sink temperature normal
again" (E.nOH) and is therefore resettable.
A level between 0° C and 90 °C, when the pre-warning is triggered can be adjusted with Pn.11 "OH warning
level". The response to the warning message is set with Pn.10 "warning OH stop. mode".
Internal overtemperature
The interior temperature monitoring protects the inverter against malfunctions caused by too high temperature
in the interior of the inverter. Upon exceeding a unit-specic temperature the interior fan is activated. If the tem-
perature is still too high after about 10 min., the disconnecting time set with Pn.17 "internal overtemperature
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 "warning OHI stop. mode" is executed.
After expiration of the disconnecting time, "6: ERROR! Overtemperature interior" (E.OHI) is triggered.
When the interior temperature has dropped again, the inverter state changes again to "7: interior temperature
back to normal" (E.nOHI). The error can now be reset.
7.13.1.6 External fault
With Pn.04 "Input selection external error", 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 dened. With Pn.65/
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.
7.13.1.7 Bus error
The inverter contains two watchdogs that monitor the communication between an external bus, operator, and
inverter control.
With parameter Pn.05 "Response to E.bus", the response to a watchdog error is dened. Dependent on the
chosen adjustment, either "Error! Watchdog" (E.buS) or "Warning! Watchdog error" (A.buS), is issued or a war-
ning message via a digital output is generated.
Watchdog time (Pn.06)
This watchdog monitors the communication at the operator interface. With activated watchdog, the response
set in Pn.05 is triggered after expiration of an adjustable time (0.01...40 s) without incoming telegrams.
The function is deactivated by setting the value "0: off".
HSP5 Watchdog time (SY.09)
The HSP5 watchdog function monitors the communication of the HSP5 interface (control card - operator; or
control card - PC). After expiration of an adjustable time (0.01...10 s) without incoming telegrams, the response
adjusted in Pn.05 is triggered. Value „0: off“ deactivates the function.
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