Protection functions
© KEB, 2015-07 COMBIVERT R6-N Page3.6 - 3
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3.6 Protection functions
The protective functions protect the regenerative unit against switching off caused by overcurrent, overvoltage
as well as thermal overheating. Furthermore, you can restart the drive after an error automatically (Keep-On-
Running).
3.6.1 Error and warning messages
For diagnostic purposes, the regenerative unit displays different malfunction- and error messages. Errors are all
thoseeventsthattriggeranimmediateswitchingoffofthemodulation,malfunctionsallowadenedresponse.
For some events (ext. error, bus monitor response), one can decide in the programming whether this is an error
or a malfunction.
A pre-warining can be generated for some errors, such as for example the overload error. This pre-warning is
treated like a malfunction, i.e., the appropriate response to the pre-warning is programmable.
Example 1 (error):
Theregenerativeunitdetectsovercurrentandraisestheerror.Displayinparameterru.00:"Error!Overcur-
rent" (E. OC). Since this error cannot be predicted, there is no possibililty of a pre-warning. The modulation is
switched off immediately.
Example 2 (operating condition programmed as error):
Thereactionofthebusmonitor("watchdog")shalltriggeranerror.ProgrammingPn.05:„Watchdogresponse“=
0(error/noautorestart).Displayinparameterru.00:"ERRORbus"(E.buS).Ifadigitaloutputisprogrammed
on a fault signalling relay, the relay switches.
Example 3 (operating condition programmed as malfunction):
Thereactionofthebusmonitor("watchdog")shalltriggeramalfunction.ProgrammingPn.05:„Watchdogre-
sponse“=0(error/noautorestart).Displayinparameterru.00:"ERRORbus"(E.buS).Ifadigitaloutputis
programmed on a fault signalling relay, the relay does not switch by fault.
(If the digital output shall also respond to malfunctions, switching condition 6 "abnormal stopping / error" must
be used. Alternatively, Pn.65 can be adjusted so that a malfunction is treated like an error with respect to the
status displays and the digital outputs. see chapter 5. Error Diagnosis
Example 4 (pre-warning):
If the heat sink temperature exceeds a limit (dependent on the unit type), the modulation is switched off, the
unit raises an error. With Pn.11 "heat sink overtemperature warning level" a temperature can be set at which a
pre-warning is generated.
Desiredresponse:whenexceedingthetemperatureofPn.11theunitswitchesoffthemodulation.Whenthe
heat sink temperature decreases again, an automatic restart shall occur.
Programming Pn.10 „warning OH stop. mode“ = 3 (modulation off/ auto restart).
Displayinparameterru.00:"Warning!Heatsinktemperature"(A.OH)
After decreasing the temperature the unit carry out an automatic restart. If, however, the heat sink temperature
continues to rise and exceeds the error limit, the COMBIVERT raises an "Error! Heat sink temperature" (E. OH).
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