Operating Instructions ACU
Examples of reference positioning as a function of the parameter settings selected.
The reference point is registered according to parameter Signal source 459 in operation mode 16–
S6IND, pos. edge by a signal on digital input 6.
The Positioning distance 460 with parameter value 0.000U (default) defines a direct stop of the
drive with the deceleration behavior selected in parameter Operation Mode 630, and the set
Deceleration (Clockwise) 421. If a Positioning distance 460 is set, positioning is done at the set
deceleration.
The Signal correction 461 of the signal run time from the measurement point to the frequency
inverter is not used if it is set to 0ms.
The Load correction 462 can compensate a faulty positioning by the load behavior. By default, this
function is deactivated, i.e. set to 0.
The Activity after positioning 463 is defined by operation mode 0–End positioning.
The Time to wait 464 is not considered because operation mode 0 is selected for parameter Activity
after positioning 463.
The actual value Rotations 470 enables a direct comparison with the required Positioning distance
460. In the case of deviations, a Signal correction 461 or Load correction 462 can be performed.
13.6.2 Axle Positioning
For axle positioning, a speed feedback system is required. In most cases, an additional extension
module is required for evaluation. The operation mode for parameter Operation Mode Speed Sensor
2 493 is to be set to 1004 or 1104. For information on how to set the parameter, refer to the
instructions on the optional extension module. The positioning is started if a start signal is received
and the frequency drops below an adjustable frequency limit. The machine stops with the selected
stopping behavior at the entered position angle.
To ensure the correct function of the axis positioning, the speed controller should be optimized after
the guided commissioning. This is described in chapter "Speed controller".
Via parameter Reference orientation 469, the angle between the reference point and the required
position is entered.
If this value is changed while the machine is at a standstill, the positioning operation is carried out
again at a frequency of 0.5 Hz. For this, a stopping behavior must be selected for the parameter
Operation Mode 630 which impresses a starting current either permanently when the drive is at a
standstill or for the stopping time (refer to chapter "13.2 "13.2").
During the positioning operation, the direction of rotation of the drive may change,
regardless of whether the command Start clockwise or Start anticlockwise was
activated.
Make sure that the change of the direction of rotation cannot result in any personal or
material damage.
The positioning is started by a start command from a signal source
(e. g. digital input), which must be assigned to parameter Start Positioning of Axle 37. The signal
source can be selected from the operation modes for digital inputs described in chapter "".
The positioning starts on condition that the Actual Frequency 241 of the output signal is smaller
than the value entered in parameter Positioning Frequency 471. Due to a stopping behavior, the
actual frequency drops below the positioning frequency.
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