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KFU 2-/4-
172
14.4.1 Start
command
The parameters
Start Clockwise
68
and
Start Anticlockwise
69
can be linked to the
available digital control inputs or the internal logic signals. The drive is only acceler-
ated according to the control method after a start command.
The logic functions are used for the specification of the direction of rotation, but also
for using the parameterized
Operation mode
620
for the starting behavior and
Opera-
tion mode
630
for the stopping behavior.
14.4.2 3-wire
control
In the case of 3-wire control, the drive is controlled using digital pulses. The drive is
prepared for starting via the logic state of the signal
Start 3-wire control
87
and
started by a Start clockwise pulse (Parameter
Start clockwise
68
) or a Start anti-
clockwise pulse (Parameter
Start anticlockwise
69
). By switching off the signal
Start
3-wire control
87
, the drive is stopped.
The control signals for Start clockwise and Start anticlockwise are pulses. The func-
tions Start clockwise and Start anticlockwise for the drive are latching-type functions
when signal
Start 3-wire control
87
is switched on. Latching is cancelled when the
latching signal is switched off.
Start
Machine
Start anticlockwise
Start clockwise
1
2
t
R
R
L
(R)
Clockwise
(1)
Signals are ignored
(L)
Anticlockwise
(2)
Time t < 32 ms
The drive is started according to the configured starting behavior if the signal
Start 3-
wire control
87
is switched on and a positive signal edge for Start clockwise or Start
anticlockwise is detected.
Once the drive has started, new edges
(1)
on the start signals will be ignored.
If the start signal is shorter than 32 ms
(2)
or if both start signals were switched on
within 32 ms
(2)
, the drive will be switched off according to the configured stopping
behavior.
3-wire control is activated with parameter
Local/Remote
412
:
Local/Remote
412
Function
5
-
Control 3-wire,
sense of rot. via
contacts
3-wire; control of direction of rotation and signal
3-wire
control
87
via contacts.
46
-
Control via 3-wire +
KP,
dir. of rot. via con-
tacts + KP
3-wire and control unit; control of direction of rotation
and signal
3-wire control
87
via contacts or control unit.
For further operation modes of parameter
Local/Remote
412
, refer to chapter „Bus
Controller“.