3.结束语
理论上的剖析能够证实,该规划思路是彻底合理的。实践中,变频器选用直流制动并配适宜当的直流制动时刻,开始频率和制动准位所发作的电机刹车作用也对比明显。
挑选精确的变频器制动电阻是确保制动作用并防止设备损坏的必要条件:
首要要核算制动功率并绘制精确的制动曲线;再依据制动曲线断定制动周期及制动功率;依据所断定的制动功率及制动周期,一起参阅电压、阻值等条件挑选适宜的制动电阻;所选制动电阻阻值不能小于选型手册中规则的数值,否则将直接构成变频器损坏!这在电阻选型时应予以阐明。
有时候制动功率欠好断定,或为了确保安全,可挑选制动功率较大的电阻;西门子规范传动产品供给的MM4系列制动电阻均为5%制动周期的电阻,所以在选型时应加以留意;制动周期在参数P1237中挑选;一起应将P1240设置为0用以禁止直流电压操控器。
制动周期的核算有时候简单紊乱。实践上,5%制动周期就意味着制动电阻能够在12秒钟内耗费100%的功率,然后需求冷却228秒钟。当然假如制动的时刻小于12秒钟,或许耗费的功率低于100%是别的一种状况,变频器会核算制动电阻的i2t。假如制动周期大于5%,440答应设置较高的制动周期,但实践上很难精确地核算出制动的状况。比如说,一台变频器每分钟制动5秒钟,制动功率50%。在这种状况下,通常主张挑选比理论核算稍大一些的电阻,一起在参数P1237中相应地设置高一些的制动周期。
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