Operating Instructions ACU
16.4.1 Start command
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 accelerated 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 Operation Mode 630 for the
stopping behavior.
16.4.2 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-Ctrl 87 and started by a Start Clockwise pulse
(parameter Start Clockwise 68) or a Start Anticlockwise pules (parameter Start-Anticlockwise 69).
The drive is stopped by turning the signal Start 3-Wire-Ctrl 87 off.
The control signals for Start clockwise and Start anticlockwise are pulses. The functions Start
clockwise and Start anticlockwise for the drive are latching-type functions when signal Start 3-Wire-
Ctrl 87 is turned on. Latching is canceled when the latching signal is switched off.
Start
Machine
Start anticlockwise
Start clockwise
1
2
t
R
R
L
The drive is started according to the configured starting behavior if the signal Start 3-Wire-Ctrl 87
is 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:
Ctrl. 3-wire,
direction Cont.
3-wire; control of sense of rotation and signal
3-Wire Ctrl 87 via contacts.
Ctrl. 3-Wire+KP, Dir.
Cont. +KP
3-wire and control unit; control of direction of rotation and signal 3-Wire
Ctrl 87 via contacts or control unit.
For further operation modes of parameter Local/Remote 412, see Chapter 19.3 "19.3".
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