Technical data

23
Inverter selection and dimensioning
Synchronous permanent magnets servomotors
(intermittent load)
Active cube is driving high performance
synchronous PM servomotors (e.g. Bonfiglioli BTD
and BCR series). Applications are usually featured
by intermittent very high torque demand for
short time. An example of typical torque profile is
shown below.
In case of intermittent torque with high peaks, the
dimensioning and selection of Active Cube, can be
done through these steps:
a. Check mains supply phases (1 or 3 phase) and
mains supply voltage (≈230V or ≈400V)
If mains voltage is 1ph-230V or 3ph-230V -> ACU201 series
If mains voltage is 3ph-400V -> ACU401 series
b. Check if application conditions (ambient
temperature, altitude, mains values,…) are
within rated conditions
-> in case of unusual operating conditions,
please refer to DSC for proper product
dimensioning.
c. Calculate RMS torque M
RMS
and relevant RMS
motor current I
RMS
required, depending on load
profile graphic of the application
d. Calculate motor peak torque M
MAX
out of load
profile graphic of the application and resulting
peak current required I
MAX
e. Select the drive matching together following
conditions:
- I
n
drive ≥ I
RMS
motor (rated drive current higher
than equivalent motor current)
- I
pk
drive ≥ I
MAX
motor (peak drive current higher
thanPKmotorcurrent)
f. Is Bonfiglioli BTD or BCR servomotor used?
Yes: -> Select EMRES03 or EMABS01 feedback
modules (see option modules in “expansion
modules” section of this catalogue)
No: -> Select any feedback module suitable to
the servomotor used (see option modules in
“expansion modules” section of this catalogue)
g. EMC protection class required
1. A1 -> nothing required up to 9,2kW
2. A2 -> external EMC filter required (see EMC
filters in “Accessories” section of this catalogue)
3. B -> external EMC filter required (see EMC
filters in “Accessories” section of this catalogue)
h. Input, output, feedback acquisition,
communication among drives needed?
-> Select expansion modules (see options
modules in “expansion modules”section of this
catalogue)
i. Communication with other electronic devices
(PLC,HMI,DCS,…)needed?
-> Select communication modules (see options
modules in “communication modules” section of
this catalogue)
j. Harmonicproblemsexpected?
-> Select line choke (see line choke in
“Accessories” section of this catalogue)
k. Is braking resistor required?
-> Select braking resistor (see braking resistor in
“Accessories” section of this catalogue)
Torque
Time