Application Manual CDA3000
5-125
5 Software functions
1
2
3
4
5
6
A
DE
EN
FR
Settings of the function selector CLCLx for current-controlled
startup/rundown
BUS KP/DM Function
0 OFF Current-controlled startup inactive
1 CCWFR
During acceleration with the acceleration ramp ACCRx (1), when 75%
of the current limit CLCLx (2) is reached the acceleration is reduced in
linear mode from 100% ACCRx at the current limit 75% CLCLx to 0%
ACCRx at 100%CLCLx. This means that at 100% CLCLx the drive is
no longer being accelerated (3).
If the current limit 100% CLCLx is exceeded (4), the reference fre-
quency is reduced. The reduction is effected with the steepness
specified in CLRRx. The steepness rises in linear mode up to 100%
CLRRx at the current limit 125% CLCLx. This process is limited when
the lowering frequency CLFLx is reached (5).
When the apparent current falls below the current limit 100% CLCLx
the drive is again accelerated with the acceleration ramp ACCRx. The
conditions previously detailed apply once again.
The same also applies to braking, where the frequency can be
increased up to the maximum.
2CCWFS
Function as in the case of CLSLx = 1, but the output frequency is
stopped at 125% CLCLx. That is to say, there is no acceleration or
frequency reduction.
( )
For a representation of the operation phases see Figure 5.44 and
Figure 5.45.
Table 5.81 Settings for function selector CLSLx
Explanatory notes
• The function implements a current limitation by altering the startup/
rundown ramps.
• In the frequency range 0 Hz to the initial frequency CLFRx the
current acceleration ramp ACCRx is reduced to 25%.
• The control remains active after startup. In this way, under increas-
ing load - and thus increasing current - the speed is reduced under
ramp control, in order to protect the motor against stalling. The
same also applies to braking, where the frequency can be
increaseduptothemaximum.
• The current limit CLCLx relates to the device rated current.
The rated current of the respective inverter module is designated as
CLCLx = 100%.
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