Panasonic Minas-LIQI Series Technical Reference

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№SR-ZSV00039 － 65 －Motor Business Unit, Appliances Company, Panasonic Corporation7－4 Protection Function Setting before Gain AdjustmentWhen carrying out the gain adjustment, you can enjoy the comfortable usage of it by properly setting the parametersbelow according to the operating condition.１） Overtravel limit settingAllows you to proactively avoid a collision at the end by entering the limit sensor signal into the am-plifier. Refer to positive/ negative overtravel limit (POT/ NOT) in the interface specification. Also, set upthe following parameters related to overtravel limits:Pr5.04 “Over-travel inhibit input setup”Pr5.05 “Sequence at over-travel inhibit”２） Torque limitThe damage can be reduced when a problem, such as equipment’s bite and collision, occurs by restrict-ing the motor’s maximum torque. To uniformly restrict the torque with parameter, set up Pr0.13 “1st torquelimit”.However, when restricted to less than practically necessary torque, be careful that the position deviationexcess protection can occur because a overspeed protection due to overshooting or a command delay oc-curs.Also, the limited torque state can be externally detected by allocating the torque limited output (TLC) asthe interface specification to the output signal.３） Overspeed protectionWhen the motor runs at unusual high-speed, Err26.0 “Over-speed protection” is generated.By default, it is automatically set to 1.2 times of maximum speed [r/min] of the motor used.When the maximum speed under customer’s operating condition is less than the motor’s maximumspeed, set up Pr5.13 “Over-speed level setup” according to the expression below:Pr5.13 “Over-speed level setup” = Vmax  (1.2 to 1.5)Vmax: Motor’s maximum speed [r/min] under the operating conditionThe coefficient enclosed in parentheses is a margin for avoiding the frequent occurrence ofoverspeed protections.In addition, when making the motor speed slow at initial adjustment, by establishing a value by multi-plying the speed by the margin, you can use the value as a protection just in case it turns into an oscillationstate.