-
6.1
.l
Automatic chopper frequency reduction
If
you want to operate the frequency controller with 4 kHz (Cl43
=
-2-
to
-6-)
or a
higher
chopper frequency, but also require an
improved smooth running with low Speeds, you
tan
activate an
automatic chopper frequency reduction, restricted to this range. For
this, enter the output frequency
under
C143, below which the
chopper frequency is to be reduced automatically to 2 kHz.
When selecting the chopper frequencies
“12kHz
fixed”
(CO1 8 =
-7-)
and “16 kHz fixed” (CO18 =
-8-),
you must set Cl43
“Threshold for automatic chopper frequency reduction to 2
kHz”
to
0.0 Hz. Otherwise the controller would reduce its chopper
frequency to 2 kHz below the set threshold. This may darnage or
destroy connected filters.
Code Name
Parameter
(Factory setting is
printed in
bold)
Acceptance
C143’
Threshold for
0,O
Hz 0.0 Hz (0.1 Hz}
10.0
Hz ON-LINE
automatic
chopper
INF0:O.O
Hz = automatic chopper-frequency
frequency
limitation switched off
limitation
to
* extended
code
set
6.2
Automatic DC-injection brake
Under
code
CO19 you
tan
enter an output frequency below which
the DC-injection brake is automatically
active.
Code
Name
Parameter (Factory
setting
is printed in bold)
Acceptance
CO19 Threshold for 0.0 Hz
7.5 Hz {O.l
Hz}
100.0 Hz ON-LINE
automatic
DC-
100 Hz
(1
Hz)
480 Hz
injection
brake
INFO: 0.0 Hz = automatic
DC-injection
brake
switched off
For
further
information
about
setting the DC-injection brake see
page 82.
6.3 Slip
compensation
Under
load, the
Speed
of an asynchronous
machine
is considerably
reduced.
You
tan
almost
eliminate this load-dependent
Speed
reduction,
also referred to as
Slip,
by using the
Slip
compensation.
In a frequency range from approximately 5 Hz to V/f-rated
frequency (CO1
5),
an accuracy of
An/nN
<
1%
tan
be obtained.
The value to be entered
under
CO21 is directly proportional to the
rated
Slip
of the
machine.
Code
Name Parameter (Factory setting is printed in bold) Acceptance
CO21
Slip
0.0 %
0.0
%
(0.1
%)
20.0 % ON-LINE
compensation
hze
97
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