KEB COMBIVERT G6 series, Installation Manual, Page: 33 / 42

GB - 33
Parameter Description
CP.25 Max. constant current
This function protects the frequency inverter against switch off through overcurrent during
constant output frequency. When exceeding the adjusted value, the output frequency is redu-
ced until the value drops below the adjusted value. CP. 03 displays "SSL" at active function.
CP.26 Speed search condition
When connecting the frequency inverter onto a decelerating motor, an error can be triggered
by the differing rotating field frequencies. With activated speed search the inverter searches
for the actual motor speed, adapts its output frequency and accelerates with the adjusted
ramp to the given set value. During speed search CP.03 displays "SSF". The parameter de-
termines, under what conditions the functions operate.
In case of several conditions the sum of the value must be entered. Example: CP.26 = 12
means after reset and after auto-reset UP.
Value Condition
0 Function off
1 at control release
2 at switch on
4 after reset
8 after Auto-Reset UP
CP.27 Motor protection / response
The motor protective function protects the connected motor against thermal destruction
caused by high currents. The function corresponds largely to mechanical motor protective
components, additionally the influence of the motor speed on the cooling of the motor is taken
into consideration. The load of the motor is calculated from the measured apparent current
(CP.04) and the adjusted rated motor current (CP.29).
For motors with separately driven fan or rated frequency of a self-ventilated motor following
tripping times (VDE 0660, part 104) apply:
1,2 • Rated current ≤ 2 hours
1,5 • Rated current ≤ 2 minutes
2 • Rated current ≤ 1 minute
8 • Rated current ≤ 5 seconds
In case of failure CP.27 activates the motor protection function and adjusts the corresponding
response as follows:
CP.27 Response Description
0 Error,
restart after reset
Error message E.xx
Immediate switch off of modulation. Correct the error for
the restart and activate reset.
The prewarning changes into an error. The drive remains
in the error state until a reset signal is recognized.
1 Quick stopping,
modulation off,
restart after reset
Status message A.xx
Fast stop - switch off of modulation after reaching 0 Hz.
Correct the error for the restart and activate reset. The
drive remains in condition fast stop until a reset signal
is recognized.
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