KEB COMBIVERT F5 MULTI User Manual

5
67 5
KEB COMBIVERT F5
Name: Basis
04.05.04
6
Abschnitt SeiteDatum
© KEB Antriebstechnik, 2002
All rights reserved
Kapitel
Functional DescriptionProtective Functions
6.7.2 Current Limit
Constant Run
(Stall-Function)
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:
Pn.19 Stall mode
Binäry
Bit 0/1
xxxxxx00
xxxxxx01
xxxxxx10
xxxxxx11
Bit 2
xxxxx0xx
xxxxx1xx
Bit 3
xxxx0xxx
xxxx1xxx
Bit 4
xx0xxxxx
xx1xxxxx
Bit 5
x0xxxxxx
x1xxxxxx
Bit 6
0xxxxxxx
1xxxxxxx
Bit 7
0xxxxxxx
1xxxxxxx
dec.
0
1
2
3
0
4
0
8
0
16
0
32
0
64
0
128
Description
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 accelerates to
oP.6/oP.7 oP.10/oP.11
oP.36/oP.37 oP.10/oP.11
oP.6/oP.7 oP.40/oP.41
oP.36/oP.37 oP.40/oP.41
With this bit one adjusts whether the control direction inverts itself
during generatoric operation.
Control direction independent on active current
Control direction is inverted in the case of negative active current
(generatoric operation)
This bit determines the control mode.
The frequency is increased/decreased by way of the ramp
generator. The ramp time is preset by Pn.21.
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.
Determines when the stall controller should intervene,
Stall-controller only active during constant running factual=fset
(status ru.0: fcon or rcon)
Stall-controller generally on
Determines which actual value serves for the control
Apparent current (default)
Active current; this setting in combination with Bit3 = „1“ is
necessary for generatoric operation (at F5-B = value 0)
Determines the torque/speed characteristic of the Stall-function.
Positive characteristic, e.g. for fans, the frequency must be
reduced so that the utilization decreases.
Negative characteristic, e.g. for drilling machines, the frequency
must be increased so that the utilization decreases.
Current limitation calculation above the rated point
No current limitation calculation
Current limitation calculation above the rated point. Above the
rated point (uf.0) the Stall-level (Pn.20) is lowered according to
following formula:
Rated point (uf.0) ²
Current limit = Pn.20 •
(
———————
)
Actual freq. (ru.3)

KEB COMBIVERT F5 MULTI Specifications

General

Brand	KEB
Model	COMBIVERT F5 MULTI
Category	DC Drives
Language	English