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求助，由于對HLP--B變頻器不熟，特此請教。       變頻器帶電動機(jī)正傳-----遇到工件-----停------電機(jī)反 轉(zhuǎn)  -----把工件拉回來-----再遇阻力再正轉(zhuǎn)，此過沒有感應(yīng)器，實(shí)現(xiàn)自動正反轉(zhuǎn)。不知如何實(shí)現(xiàn)的？                                                                                                                                                                                                                                                                                                                                                

轉(zhuǎn)矩模式，扭矩達(dá)到一定值后換相？