Current Limit Constant Run (Stall-Function) - KEB COMBIVERT F5 MULTI Applications Manual

Protective Functions
6.7.2 Current Limit
Constant Run
(Stall-Function)
Pn.19 Stall mode
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All rights reserved
The Stall-function protects the frequency inverter against overload. Upon reaching the
maximal constant current the utilization is reduced by increasing/decreasing the output
frequency. When falling below the maximal constant current the inverter accelerates/
decelerates again with the normal ramp time. These adjustments apply only to F5-B,
F5-G and F5-M in controlled operation (CS.0=off). The basic mode of operation is
determined with Pn.19:
Binäry
dec. Description
Bit 0/1
Final value to which deceleration/acceleration takes place. Both
limits are always adjusted as the control direction may be inverted
during generatoric operation.
decelerates to
xxxxxx00
0 oP.6/oP.7
xxxxxx01
1 oP.36/oP.37
xxxxxx10
2 oP.6/oP.7
xxxxxx11 3 oP.36/oP.37
Bit 2 With this bit one adjusts whether the control direction inverts itself
during generatoric operation.
xxxxx0xx
0 Control direction independent on active current
xxxxx1xx
4 Control direction is inverted in the case of negative active current
(generatoric operation)
Bit 3 This bit determines the control mode.
xxxx0xxx 0 The frequency is increased/decreased by way of the ramp
generator. The ramp time is preset by Pn.21.
xxxx1xxx
8 The frequency is increased/decreased by a setpoint/actual-value
differential controller. The time constant of the controller is preset
by Pn.21, the setpoint is preset by Pn.20.
Bit 4 Determines when the stall controller should intervene,
xx0xxxxx
0 Stall-controller only active during constant running factual=fset
(status ru.0: fcon or rcon)
xx1xxxxx
16 Stall-controller generally on
Bit 5 Determines which actual value serves for the control
x0xxxxxx 0 Apparent current (default)
x1xxxxxx 32 Active current; this setting in combination with Bit3 = „1" is
necessary for generatoric operation (at F5-B = value 0)
Bit 6 Determines the torque/speed characteristic of the Stall-function.
0xxxxxxx 0 Positive characteristic, e.g. for fans, the frequency must be
reduced so that the utilization decreases.
1xxxxxxx
64 Negative characteristic, e.g. for drilling machines, the frequency
must be increased so that the utilization decreases.
Bit 7 Current limitation calculation above the rated point
0xxxxxxx 0 No current limitation calculation
1xxxxxxx 128 Current limitation calculation above the rated point. Above the
rated point (uf.0) the Stall-level (Pn.20) is lowered according to
following formula:
Current limit = Pn.20 •
Name: Basis
KEB COMBIVERT F5
Functional Description
Rated point (uf.0)
(
———————
Actual freq. (ru.3)
Datum
04.05.04
accelerates to
oP.10/oP.11
oP.10/oP.11
oP.40/oP.41
oP.40/oP.41
²
)
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