Examples of reference positioning as a function of the parameter settings selected.
− The reference point is registered according to the Signal sources 459 parameter
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 Op-
eration mode
630 and the selected Deceleration (clockwise) 421. If a Position-
ing distance
460 is set, the positioning is affected 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 be-
havior. By default, this function is deactivated, i.e. set to 0.
− The Activity after positioning 463 is defined by operation mode 0–End of posi-
tioning.
− The Waiting time 464
is not considered because operation mode 0 is selected for
the parameter Action after positioning 463.
− The actual value Revolutions 470
enables a direct comparison to the required
Positioning distance 460. In the case of deviations, a Signal correction 461
462 can be carried out.
12.6.2 Axle Positioning
For axle positioning a feedback system is mandatory. In most cases, an expansion
module for the feedback evaluation is needed as well. The operation modes for pa-
rameter
Operation mode Speed sensor 2 493 are to be set to 1004 or 1104. For in-
formation on how to set the parameter, refer to the instructions on the optional ex-
pansion module. The positioning is started if a start signal is received and the fre-
quency drops below an adjustable frequency limit. The machine stops with the se-
lected stopping behavior at the entered position angle.
To ensure the correct function of the axle positioning, the speed controller should be
optimized after the guided commissioning. This is described in the chapter "
Via the 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 sta
ndstill, 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 „Stopping Behavior“).
CAUTION
During the positioning operation, the direction of rotation of the drive may change,
regardless of whether the command Start clockwise or Start anticlockwise was acti-
vated.
Make sure that the change of the direction of rotation cannot result in any personal or
06/13 Operating Instructions ACU 147
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