GE Industrial Solutions DV-300 DC Drive Users Manual - Manual (Page 304)

GEI-100332Ga
——— FUNCTION DESCRIPTION ———
6
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6.17 TORQuE WINDER FuNCTION
The center wind function inside the DV300 converters is used to control winders and unwinders whose tension
regulation is carried out via an open or closed loop control.
Apart from calculation functions for torque, diameter, compensation and Taper tension, the system foresees the
calculation of the motor speed reference. Such function allows to use the drive on the four regulation quadrants
controlling both winders and unwinders, and to control the motor with a peripheral speed proportional to the
diameter in case of a break of the wound material.
The torque is adjusted according to the motor flux, thus meaning that the system is suitable to control motors
with a constant torque-power ratio.
The closed loop regulation foresees an analog input for the loading cell 0…10V, 0…20mA, 4…20mA.
The output of the center wind function is sent directly to the current limits; the specific parameters T current
lim +/- and the limits set by the programmable overload function are anyway active in order to protect both
the inverter and the motor; among the three possible settings the one with the lowest value is always the most
important.
Input / Output
Line spd source Line speed sampling parameter. It is used exclusively for the diameter calculation. The
speed threshold, Ref speed thr, under which the calculation procedure is blocked, refers
to Ref line speed. It can be programmed as analog input or encoder input.
Ref spd source Line reference sampling parameter. It is used exclusively for the calculation of:
- the inertia compensations
- the line speed reference.
It can be programmed as analog input or encoder input.
Analog inputs
Tension ref
Per cent tension reference; 10V (20mA) = 100%.
Tension red Per cent decrease in the Taper tension; 10V (20mA) = 100%.
Diam preset 3 Setting of the starting diameter; 10V (20mA) = max. diameter.
Analog outputs
Roll diameter
Present diameter; 10V = max. diameter.
Act tension ref Tension reference decreased by the Taper percentage; 10V = 100% Tension ref.
Torque current Request for torque current; 5V = drive size.
W reference Reference for angular speed, 10V = 100% Base omega.
Actual comp Active compensation monitor (it sums up static, dynamic and inertial frictions); 5V =
drive size.
Digital inputs
Torque winder En
Enabling of the center wind function.
Diam calc Dis Enabling of the diameter calculation.
Diam inc/dec En If enabled and if winder, the calculated diameter can never decrease; if unwinder the
calculated diameter can never increase. It is used to improve the system stability.
Wind/unwind Winder/unwinder selection: 0 = winder, 1 = unwinder.
Winder side Selection of the winding/unwinding side: 0 = up, 1 = down