Cleveland Motion Controls Quantum Tension Controller REV A - Manual (Page 25)

25
Menu FUNCTION
4.4 Inertia
This menu is available for open loop configuration when inertia compensation is required.
Inertia compensation function
The inertia compensation function allows the controller to increase or decrease the output
during the acceleration/deceleration periods. This coefficient (inertia gain) is related to the roll
inertia (proportional to the actual diameter measurement) and to the actual line speed
(tachometer input). When the web width is not constant, it is possible to adjust the calculated
inertia term by entering the coefficient Web width (also always available to the operator on the
controller front panel).
Calculation - Inertia gain GI:
Data:
Max roll weight M (Kg)
Max roll diameter D (m)
Max line speed VL (m/s)
Decceleration duration T (s)
Rated current for the chosen Brake IC (A)
Max current adjusted on the power supply board IR (A)
Rated torque for the chosen Brake CN (Nm)
Formula : GI = M x VL x D x IC x 100
240 x T x CN x IR
Adjustment procedure:
Proceed with the first tests with the maximum web width (Coeff. Web width = 100 %).
Temporarily disable the open loop control (Closed loop gain = 0 %) to avoid interactions during
the adjustment procedure.
- Apply a high filtering coefficient on the diameter input (slow variation input): Diameter
filtering = 500
- Enter a low filtering coefficient on the Tachy measurement input to avoid fast transient
troubles
- Apply the calculated inertia gain (above formula)
- Start the machine and adjust the inertia gain value to stabilize the actual measurement
during acceleration/deceleration periods.