FR-A701 INSTRUCTION MANUAL (Applied) - Automation Systems ...

4PARAMETERS(2) Optimum acceleration/deceleration mode (Pr. 292 = "3", Pr. 293)Setting of acceleration/deceleration timeand acceleration/deceleration pattern⋅ The optimum operation within the rating range where the inverter can be continuously used regardless of theinverter capability is performed.Automatically set torque boost and acceleration/deceleration time so that the average current during acceleration/deceleration is the rated current by the self-learning of the inverter.It is appropriate for applications such as automatic transfer machine, etc. which is small in load change and isoperated in a predetermined pattern.⋅ At the initial time when the optimum acceleration/deceleration mode has been selected, operation is performed atthe values set in Pr. 0 Torque boost, Pr. 7 Acceleration time and Pr. 8 Deceleration time. After operation, the averagecurrent and peak current are calculated from the motor current during acceleration/deceleration.These values arecompared with the reference current (initial value is rated inverter current) and calculated, then more appropriatevalues are set in Pr. 0, Pr. 7 and Pr. 8 .After that, operation is performed under the conditions of Pr. 0, Pr. 7 and Pr. 8 set, and more appropriate values arecalculated.Note that the Pr. 0 value will not change under advanced magnetic flux vector control, real sensorless vector controlor vector control.⋅ When overvoltage fault (E.OV3) occurs at deceleration, the Pr. 8 setting value becomes 1.4 times larger.⋅ Storage of parametersThe optimum values of Pr. 0, Pr. 7 and Pr. 8 are written to both theparameter RAM and EEPROM only three times of acceleration/deceleration after the optimum acceleration/deceleration modehas been selected or after the power is switched on or theinverter is reset. At of after the fourth attempt, they are notstored into EEPROM. Hence, after power-on or inverter reset,the values changed at the third time are valid. Note that thevalues changed at the fourth or later time are calculated tooptimum and the values of Pr. 0, Pr. 7 and Pr. 8 are set to RAM,the values can be stored into EEPROM by reading and writtingthe values with the operation panel and paramter unit.Number ofOptimumValueChangesPr. 0, Pr. 7, Pr. 8EEPROMvalueRAMvalueOptimumConditions1 to 3 times Updated Updated Updated4 or moretimesUnchangedfrom thirdvalueUpdatedUpdated⋅ Either acceleration or deceleration can be made in the optimum acceleration/deceleration mode using Pr. 293Acceleration/deceleration separate selection.When the setting value is "0" (initial value), both acceleration and deceleration are made in the optimumacceleration/deceleration mode.⋅ It is inappropriate for machines which change in load and operation conditions.Since the stored optimum values are used for the next operation, faults, e.g. acceleration/deceleration is not madeif conditons change, alarm stop is made due to overcurrent protective function, may occur.⋅⋅⋅⋅⋅REMARKSIf shortest acceleration/deceleration mode has been selected, inputting the jog signal (jog operation), RT signal (secondfunction selection) or X9 signal (third function selection) during an inverter stop will switch to the normal operation and givepriority to jog operation, second function selection or third function selection. Note that JOG and RT signal input is invalid evenif JOG signal and RT signal are input during operation in shortest/optimum acceleration/deceleration mode.Because of the learning system, this mode is not valid at the first operation after the optimum acceleration/deceleration mode isset.The optimum value are operated on only when acceleration is made from a stop to 30Hz or more or when deceleration is madefrom 30Hz or more to stop.When the motor is not connected or output current is less than 5% of the rated inverter current, optimum acceleration/deceleration mode will not function.Even when the optimum acceleration/deceleration mode is selected and Pr. 293 = "1" (acceleration only for the optimumacceleration/deceleration mode), overvoltage fault (E.OV3) occurrence at deceleration makes the Pr. 8 setting value be setagain longer.163