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Page 7.13 - 4 COMBIVERT F5-A, -E, -H © KEB, 2012-10
Protective functions
7.13 Protective functions
The protective functions protect the inverter against switch off caused by overcurrent, overvoltage as well as
thermal overheating. Furthermore, you can restart the drive after an error automatically (Keep-On-Running).
7.13.1 Error and warning messages
For diagnostic purposes, the inverter displays various malfunction- and error messages. Errors are all those
events that trigger an immediate switch-off of the modulation, malfunctions allow a defined response (shutdown
of the drive by abnormal stopping).
For some events (ext. error, bus monitor response, the drive hitting a limit switch, etc.), 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 inverter 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 switched off
immediately and the drive spins down.
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.
Example 3 (operating condition programmed as malfunction):
Hitting a hardware limit switch shall be treated as a malfunction. Desired response: Abnormal stopping, modu-
lation switch-off after reaching standstill, no automatic restart.
Programming Pn.07: "Limit switch error response" = 1 (Stop / modulation off / no auto restart)
Display in parameter ru.00: "Warning! disabled direction of rotation clockwise" (A.PrF) or: "Warning! disabled
direction of rotation counter clockwise" (A.Prr)
If a digital output is programmed on a fault signalling relay, the relay does not switch by default.
(If the digital output shall also respond to malfunctions, switching condition 6 "abnormal stopping / error" must
be used. Alternatively, Pn.65 can be adjusted by way that a malfunction in relation to the status displays and
digital outputs is treated as error. See chapter 7.13.12)
Example 4 (pre-warning):
When the heat sink temperature exceeds a limit (dependent on the inverter type), the modulation is switched
off, the inverter 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 inverter executes an abnormal stop and
switches off the modulation. When the heat sink temperature decreases again, an automatic restart shall occur.
Programming Pn.10 "heat sink overtemperature response" = 4 (stop/modulation off/ auto restart).
Display in parameter ru.00: "Warning! Heat sink temperature" (A. OH)
If the temperature decreases due to the abnormal stopping, the inverter executes an automatic restart. If,
however, the heat sink temperature continues to rise and exceeds the error limit, the inverter raises an "Error!
Heat sink temperature" (E. OH).