Torque Reference; Upper And Lower Limit Of The Frequency In Torque Control - BONFIGLIOLI ACTIVE Cube ACU 201-01 Operating Instructions Manual

17.5.3.1 Torque Reference

The reference torque can be specified as follows:
− Set parameter
signal and switch this on.
− Via parameter
Source 2
For example:
− The reference torque can be set via the arrow keys of the operator panel if the
following setting is selected:
motorpoti (factory setting)".
− The reference torque can be set via multifunction input 1 (MFI1A) if the following
setting is selected:
MFI1A (factory setting)".
− 100 % Torque refer to the calculated Torque from
tor power) and
Parameter
Select an applicable operation mode for parameter
645. Refer to chapter 12.5 "Search Run".
Start

17.5.3.2 Upper and lower limit of the frequency in Torque Control

In many cases limitation of the speed is required in the operating points with reduced
or without load torque, because the speed regulates itself to the torque reference
and the load behavior. To avoid an unintentional speed (mostly too high speeds, in
some cases also too small speeds and avoidance of current impression), the frequen-
cy is limited by
speed controller.
As from the limit value the drive is controlled to maximum speed (
767 and
Limit
the speed controller. Additionally, the controller limits the speed to
419. This limitation is set by the speed controller – changes in the speed
quency
controller affect the speed behavior in the limit area of the 3 mentioned parameters.
In the current impression, the speed is limited additional to
– in Direct Torque Control this limit is not active.
No.
767 Frequency upper limit
768 Frequency lower limit
Positive values limit the speed in clockwise direction; negative values limit the speed
in anticlockwise direction. In example, if both values are positive (> 0 Hz), anticlock-
wise movement is inhibited.
WARNING
If the torque control is activated while the actual frequency lies outside the defined
range of
when switching on a stopped machine or when the Flying start synchronizes), the
allowed frequency is driven to without ramps. The torque is only limited by the limita-
tions of the speed controller (current and torque). Therefore an unexpected dynamic
behavior can occur.
230
n-/T-Control Change-Over
Reference Percentage Source 1
494, select a source for the reference torque.
Reference Percentage Source 2
Reference Percentage Source 1
372 (Motor nominal speed).
Rated Speed
224 shows the actual torque.
Torque
Frequency upper limit
Frequency Lower Limit
Parameter
Description
Frequency Upper Limit
Operating Instructions ACU
164 to "6 - On" or link it to a digital
476 or
476 = "1 - analog value
Rated Mech. Power
767 and
Frequency lower limit
768), which corresponds to the behavior of
Min.
-999.99 Hz 999.99 Hz
-999.99 Hz 999.99 Hz
767 and
Frequency Lower Limit
Reference Percentage
494 = "5 - keypad
376 (Mo-
Operation Mode Flying
768 by the
Frequency Upper
Maximum Fre-
418
Minimum Frequency
Settings
Max. Fact. sett.
999.99 Hz
-999.99 Hz
768 (in example
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