KFU 2-/4-
119
Contact-controlled:
If the parameter
Braking time
632
is set to the value 0.0 s, the direct current brake is
controlled by the Start clockwise and Start anticlockwise signals. The time monitoring
and limitation by
Braking time
632
are deactivated. The braking current will be im-
pressed until the controller enable control signal (S1IND/STOA and S7IND/STOB)
becomes logical 0 (low).
Parameter
Settings
No.
Description
Min.
Max.
Fact. sett.
632 Braking time
0.0 s
200.0 s
10.0 s
To avoid current surges, which can possibly lead to a fault switch-off of the frequency
inverter, a direct current may only be impressed into the motor after the motor has
been demagnetized. As the demagnetization time depends on the motor used, it can
be set with the parameter
Demagnetizing time
633
.
The selected demagnetizing time should be approximately three times the
Act. Rotor
Time Constant
227
.
Parameter
Settings
No.
Description
Min.
Max.
Fact. sett.
633 Demagnetizing time
0.1 s
30.0 s
5.0 s
The selected stopping behavior is supplemented by a current controller to control the
direct current brake. The PI controller checks the current impression of the set
Brak-
ing current
631
. The proportional and integrating parts of current controller can be
adjusted via parameters
Amplification
634
and
Integral time
635
, respectively. The
control functions can be deactivated by setting the parameters to 0.
Parameter
Settings
No.
Description
Min.
Max.
Fact. sett.
634
Amplification
0.00
10.00
1.00
635 Integral time
0 ms
1000 ms
50 ms
11.4 Auto
Start
The Auto Start function is suitable for applications which permit a start at mains volt-
age by their function. By activation of the auto-start function via parameter
Operation
mode
651
, the frequency inverter accelerates the drive after application of the mains
voltage. The controller enabling signal and the start command are necessary accord-
ing to the regulations. When the motor is switched on, it is accelerated according to
the parameterization and the reference value signal.
Operation mode
651
Function
0 - Off
The drive is accelerated, after application of the mains
voltage, as soon as the controller enabling signal and the
start command are switched from stop to start (edge
evaluation).
1 - Switched on
The drive is accelerated by the frequency inverter as
soon as the mains voltage is applied (level evaluation).
Warning!
Comply with standard EN 60204 and VDE provision 0100 part 227 and
provision 0113, in particular Sections 5.4, protection against automatic
restart after main line voltage failure and voltage recovery, and Section
5.5, undervoltage protection.
Appropriate measures must be taken to exclude any risk for staff, ma-
chines and production goods.
In addition to that, all specific regulations relevant to the application as
well all national directives are to be complied with.
