Which products are affected?
ESP-SPAC-WND1 — Software Package Winder V2.2 (Template TensionControlV22 only)
Function description
If during the unwinding operation the compensation torque (e.g. friction compensation) is larger than the torque corresponding to the tensile force set, the drive can accelerate uncontrolled. The setting C3222 = 0 (default setting) avoids this acceleration by limiting the resulting setpoint torque (F*d/2 + Mcomp) to zero.
If the motor of an unwinding unit must change from operation in generator mode to an operation in motor mode the following conditions must be fulfilled:
- the compensation torque must be negative (g_bUnwindOperation = TRUE)
- the resulting torque must be negative (F*d/2 + Mcomp < 0)
In order to activate the quadrant change when using the TensionControlV22 template, a value unequal zero must be entered under code C3222. Due to this setting, the current actual value speed is compared to the setpoint speed ((Vweb / d*p) + NOffset). If the motor speed is larger than 108 % of the setpoint speed, the torque setpoint is reduced. As a result, the velocity of the drive is reduced and an uncontrolled acceleration is avoided. The gain factor which is used to reduce the torque can be parameterised via code C3222 > 0.
Applications
The automatic speed limitation is required if a drive changes from operation in the generator mode to an operation in the motor mode or vice versa during the winding process.
