KEB combivert B6 Installation Manual page 24

CP-Parameter
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
reduced 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
determines on what conditions the function operates.
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:
In case of failure CP.27 activates the motor protection function and adjusts the correspon-
ding response as follows:
CP.27 Response
0 Error,
restart after reset
Error message E.xx
GB - 24
1.2 • Rated current
1.5 • Rated current
2 • Rated current
8 • Rated current
≤ 2 hours
≤ 2 minutes
≤ 1 minute
≤ 5 seconds
Description
Immediate switch off of the 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.
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