Operating Instructions ACTIVE 06/07108
108 Operating Instructions ACTIVE 06/07
Via parameter time constant positioning contr. 479, the time constant for controlling
the positional error can be set. The value of the time constant should be increased if
oscillations of the drive around the reference orientation occur during the positioning.
Parameter Settings
No. Description Min. Max. Fact. sett.
479
Time constant positioning
controller
1.00 ms 9999.99 ms 20.00 ms
To make sure that the set position is maintained if a load torque is applied, a stopping
behavior should be selected for parameter
Operation Mode 630 which impresses a
starting current either permanently when the drive is at a standstill or for the stopping
time.
The status message „60-Arrived at desired Position“ which is displayed when the ref-
erence orientation is reached can be assigned to a digital output. The message is
output on the following conditions:
− Operation mode 2 (axle positioning) for parameter
Operation Mode 458 is se-
lected.
− The controller release signal at digital input S1IND is switched on.
−
Start Positioning of Axle 37
is activated.
− The speed sensor monitoring is activated, i.e. operation mode 2 (error message)
for parameter
Operation Mode 760
of the speed sensor monitoring is selected.
− Operation mode 1004 or 1104 (quadruple evaluation with reference impulse) is
selected for the speed sensor input.
− The
Actual Frequency 241 is lower than 1 Hz.
− The deviation of the current position from the reference orientation is lower than
the
Max positional error 472.
The current position after Start Positioning of Axle 37 is recognized by the frequency
inverter as follows:
− During commissioning, after switching on the frequency inverter, a search mode is
performed for 3 rotations at a rotational frequency of 1 Hz in order to detect the
reference signal. As soon as the reference signal was recognized twice, the drive
is positioned to the
Reference orientation 469.
− If the motor was already rotating before axle positioning was enabled, the posi-
tioning to the
Reference orientation 469
is performed without search mode be-
cause the position of the reference point was already detected by the frequency
inverter.
If the positioning is carried out, after controller enabling and start command, when
the motor is at a standstill:
− The motor is positioned clockwise to the reference orientation if the value for the
reference orientation is higher than the value adjusted before.
− The motor is positioned anticlockwise to the reference orientation if the value for
the reference orientation is lower than the value adjusted before.
The sense of rotation during the positioning is independent of whether Start Clockwise
or Start Anticlockwise was activated.
The time required until the reference orientation is reached depends on:
− Actual Frequency
− Frequency ramp for deceleration
− Rotational angle to reference orientation
− Max positional error
− Time constant positioning controller
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