15P0059B3 DCREG2
USER MANUAL DCREG4
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2.8 CURRENT (TORQUE) CONTROL MODE OPERATION
2.8.1 A current control (torque) is generally required when tension controls are performed on a winding
or unwinding material or while controlling any machine integral to another from a mechanical point of view.
In fact, said conditions require a proper torque distribution.
2.8.2 In the first event, a simple external regulation of the current limit is generally requested by
using one of the configurable analog inputs; set parameters C120(121)(122) to one of values 8:Ext.
curr.lim. ... 10:BrdgB ext.lim. The polarity of the used signal may be selected on par. P126(129)(132)
(default value: Bipolar).
For this operating mode, the speed reference should allow to keep the drive
in current limit condition at any time.
2.8.3 In the second case, a direct setting of the current reference is generally performed. To use the
REF main input between terminals 5 and 7 it is then possible to program parameter C050 as 3:Iref=Vref
(default value: PI operating) whenever a permanent configuration is required. Otherwise, it could be
advisable to close one of the MDIx configurable digital inputs by programming parameters
C130(131)(132)(133)(134)(135) at value 6:Slave Enabled whenever the current reference setting is to be
performed only through an external command enabling.
A current reference setting may be performed on any REF, IN1, IN2, IN3
analog inputs, after programming them accordingly.
In particular, if the REF main input between terminals 5 and 7 is to be used,
the Gain, Bias and Polarity operators use distinct parameters (i.e. different
from the parameters enabled in case of voltage / speed reference). In
particular, the Gain function is programmed in parameter P125(default value:
100%), the Bias function is programmed in parameter P124 (default value:
0%), while the Polarity function is programmed in parameter P123 (default
value: Bipolar).
By contrast, if auxiliary analog input IN 1(2)(3) is to be used, parameter
C120(121)(122) is to be set at value 2:I loop add. ref. In addition, main
reference REF is to become a current reference, either permanently by
programming parameter C050 at value 3:Iref=Vref or temporarily by closing a
digital input set at value 6:Slave Enabled. For each of those two modes, main
input REF is to be connected to zero volt.
For a drive couple operating in MASTER / SLAVE mode, the current reference
to be supplied by the master drive may be obtained on terminal 8(10) by
programming P150(153) = 4:Current ref. As the reference standard level
supplied by the MASTER drive is 5V at its rated current (M003 = 100%), if also
the SLAVE drive must supply its rated current - with said reference at REF
main reference between terminals 5 and 7 - gain P125 (IrefGain) is to be set
at 200%.
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