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Protective functions

3.6 Protective 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thoseevents that trigger an immediate switchingoffofthemodulation,malfunctionsallowadenedre-

sponse.

For some events (ext. error, bus monitor response), one can decide in the programming whether this is an error

or a malfunction.

For some errors, e.g., the overload error, a pre-warning can be generated. This pre-warning is treated like a

malfunction, i.e., the appropriate response to the pre-warning is programmable.

Example 1 (Error):

The regenerative unit detects overcurrent and raises the error. Display in parameter ru.00:„Error!Overcurrent“

(E.OC). Since this error cannot be predicted, there is no possibililty of a pre-warning. The modulation is swit-

ched off immediately.

Example 2 (operating condition programmed as error):

Thereactionofthebusmonitor(„watchdog“)shalltriggeranerror.ProgrammingPn.05:„Watchdogresponse“=

0 (error / no auto restart). Display in parameter ru.00:„Error!Watchdog“(E.buS).Ifadigitaloutputisprogram-

med on a fault signalling relay, the relay switches.

Beispiel 3 (operating condition programmed as malfunction):

The reaction of the bus monitor („watchdog“) shall trigger a malfunction. Programming Pn.05:„Watchdogre-

sponse“ = 0 (error / no auto restart). Display in parameter ru.00:„Error!Watchdog“(E.buS).Ifadigitaloutput

is 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.

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.

Desiredresponse:whenexceedingthetemperatureofPn.11 the unit switches off the modulation. When the

heat sink temperature decreases again, an automatic restart shall occur.

Programming Pn.10 „warning OH stop. mode“ = 3 (modulation off/ auto restart).

Display in parameter ru.00:„Warning!Heatsinktemperature“(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).

KEB combivert R6-S Applications Manual

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