Santerno DCREG2 Series User Manual page 100

15P0059B3
USER MANUAL
The figure below shows all operating features of drive DCREG2.
Any equipment for the control of a motor may perform either a speed or a torque control.
In the four cases below, DCREG2 is used to motorize a winder, an unwinder or an elevator. The driving
motor (if any) is supposed to be controlled by an external device. In the figure below, letter T stands for
the torque direction, whereas letter s stands for the motion direction.
Note that default operation for DCREG2 is enabled for quadrant 1 and 2.
Case A.
material feeding speed (current limitation must never be attained), whereas the winder motor controls the
applied torque. DCREG2 operates in current limitation mode with a positive speed reference, which is
always higher than the material feeding speed. Otherwise, DCREG2 may directly work with a preset
current reference. The driving motor will generally apply an opposite torque with respect to the material
feeding direction, except when the tension controlled by the winder is very low and the material friction is
not negligible. In this case, the driving motor will have to generate a forward torque as well.
Case B.
positive one, and the weight of the material to lift is to be heavier than the counterweight - but not as heavy
as to determine the drive operation in current limitation mode, thus compromising the forward speed
control. If the material to be lifted was lighter than the counterweight, the motor would be pulled by the
counterweight and would accelerate in a forward direction, while drive DCREG2 would be kept in neutral
(zero current).
Case C. 2nd quadrant: tension control while unwinding. The driving motor controls the material
feeding speed (current limitation must never be attained), whereas the unwinder motor controls the
applied torque. DCREG2 operates in current limitation mode with a speed negative reference, whose
absolute value is always lower than the material feeding speed. If the material is to be tensioned when the
machine is standstill, the drive should use a positive forward reference (which will be correct in any other
case). Otherwise, DCREG2 may directly operate with a preset current reference. The driving motor
generally applies a reverse torque - with the same direction as the material feeding. In the unwinder
motor, the torque direction is opposite to the speed direction; as a result, DCREG2 regenerates some
energy from the motor to the supply mains.
Case D 2nd quadrant: speed control while lowering. By default, DCREG2 has a negative
reference; the weight of the material to lower is to be heavier than the counterweight - but not as heavy as
to determine the drive operation in current limitation mode, thus compromising the reverse speed control.
If the material to be lowered is lighter than the counterweight, the motor would be pulled by the
counterweight and would accelerate in a forward direction, while drive DCREG2 would be kept in neutral
(zero current). The torque direction is opposite to the speed direction; as a result, DCREG2 regenerates
some energy from the motor to the supply mains.
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1st quadrant: tension control while winding. The driving motor controls the
1st quadrant: lifting speed control. By default, DCREG2 speed reference is a
DCREG2
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