SKS Sweden Bonfiglioli Vectron ACTIVE CUBE ACU 201 Series, Operating Instructions Manual

Page: 125 / 260

09/08
Operating Instructions ACU
123
The function "Axle positioning" is available in configurations 210 and 510 (Parameter
Configuration
30) and is activated by selecting operation mode 2 for parameter
Op-
eration mode
458.
Operation mode
458 Function
0 - Off Positioning switched off.
1 - Reference positioning
Positioning from reference point via definition of
positioning distance (rotations). The reference
point is acquired via a
Signal Source
459.
Available in Configuration: 110, 210, 410, 510.
2 - Axle positioning
Reference positioning via definition of the posi-
tioning angle, reference signal from speed sen-
sor.
Available in Configuration: 210, 510.
11.6.1 Reference Positioning
The feedback of the current position is referred to the revolutions of the motors rela-
tive to the time of the reference signal. The accuracy of the positioning for the appli-
cation to be realized is dependent on the current
Actual frequency
241, the
decele-
ration (clockwise)
421, the
No. of pole pairs
373, the selected
Positioning dis-
tance
460 and the parameterized control behavior.
The distance between the reference point and the required position is to be defined
in motor revolutions. The calculation of the distance covered is done with the se-
lected
Positioning distance
460 according to the application.
The setting 0.000 U for the
Positioning distance
460 causes an immediate stop of
the drive according to the selected stopping behavior for
Operation mode
630.
Parameter Settings
No. Description Min. Max. Fact. sett.
460 Positioning distance 0.000 U 1000 000.000 U 0.000 U
The actual value parameter
Revolutions
470 facilitates the setting and optimization
of the function. The revolutions of the motor displayed should correspond to the
Po-
sitioning distance
460 at the required position.
The minimum number of revolutions needed until the required position is reached
depends on the
Actual frequency
241 and
Deceleration
(
clockwise
) 421 (or
Decele-
ration anticlockwise
423) as well as the
No. of pole pairs
373 of the motor.
p a 2
2
f
min
U
⋅ ⋅
=
U
min
= min. number of rotations
f =
Actual frequency
241
a =
Deceleration
421 (423)
p =
No. of pole pairs
373 of motor
Example: f = 20 Hz, a = 5 Hz/s, p = 2 ⇒
rpm = 20
With an actual frequency of 20 Hz and a delay of 5 Hz/s, at least 20 rotations are
needed until standstill at the required position. This is the minimum value for the
Positioning distance
460, a shorter positioning distance is not possible. If the num-
ber of rotations until the required position is reached is to be lower, the frequency
must be reduced, the deceleration increased, or the reference point must be shifted.
Operating Instructions ACU 123 09/08