
9.8.8
Boost function
The boost function5is an automatic voltage increase in case of dynamic demands on the control
system. When using the square characteristic, the output voltage is increased to the value of the linear
characteristic with the
“
Boost function
”
switched on. This induces more torque on the motor and the
current therefore does not increase too much when accelerating. Just before reaching the setpoint of
the modulation, the motor voltage corresponding to the square characteristic is switched back to. The
boost process is only activated in case of a suf
fi
ciently large increase in modulation (from approx.
5 %).
In operation with linear characteristic (
“
UF square
”
=
“
OFF
”
) the Boost function is not possible.
Motor Setup
Boost function
ON: automatic voltage increase switched on (factory setting)
OFF: automatic voltage increase switched off
ON
Boost function
Info
Symbol for active boost process in the display.
23.4
°
C
E1 Actual
9.8.9
Suppression of speeds
Suppression of up to three speed ranges.
Under certain circumstances, it is possible to prevent disturbing noises that can arise at certain
speeds due to resonances.
Example for suppression of 2 ranges (Idealized principle diagram)
A
D
P
50 %
50 %
R
0 %
I
S
100 %
I
35 % max
15 % min
09.05.2007
v_ausblendung_prz.vsd
100 %
1
2
A
Modulation
S
Setpoint
R
Pband
D
Speed controller: setting signal
P
P-controller: control deviation
Setting depending on device type in: %, Hz, rpm
Motor Setup
→
Factory setting no suppression active =
“
OFF
”
→
Motor Setup
OFF
Suppression 1
ON
Suppression1
Motor Setup
→
Setting for
“
Range1 min.
”
Setting range:
“
Shutdown Freq.
”
-
“
Range 1 max.
”
→
Motor Setup
- - - -
Range 1 Min.
15 Hz
Range 1 Min.
Operating Instructions
Fcontrol
–
model series FKDM25/32AM-C
Programming
L-BAL-E214-GB 1446 Index 002
Part.-No.
72/99