制动周期的计算有时候简略紊乱。实践上，5%制动周期就意味着制动电阻可以在12秒钟内消耗100%的功率，然后需求冷却228秒钟。当然假设制动的时间小于12秒钟，或许消耗的功率低于100%是其他一种情况，变频器会计算制动电阻的i2t。假设制动周期大于5％，440容许设置较高的制动周期，但实践上很难精确地计算出制动的情况。比方说，一台变频器每分钟制动5秒钟，制动功率50%。在这种情况下，通常主张选择比理论计算稍大一些的电阻，一同在参数P1237中相应地设置高一些的制动周期。
1、绕组接地缺点。在三相绕组中，有一处或多处绝缘损坏，使绕组中的铁心、机座相碰，并使电流与机座相通，这么的缺点称为绕组接地缺点。
2、缺点表现。绕组接地时，假设变频调速电机外壳没有接中性线或外壳的维护接地欠好，机座会带电，用验电笔检验，能看到验电笔发光。若用手背刹那间触碰机座，则会被电击而感到手臂麻目，还或许会使变频调速电机在工作中发作失常响声、振动和过热等景象，严峻时使变频调速电机不能起动。
3、绕组接地的影响。绕组发作接地缺点后，如变频调速电机外壳维护接地不良机座会带电。虽然变频调速电机还能工作，当人体触碰机座，电流就会进过人体与大地构成回路，对人的生命有危险。当一相绕组中有一处接地时，该接地址就与机座构成回路，使相绕组的线圈匝数减少，因而使相电流增加，致使三相电流不平衡。当一相绕组中有两处一同接地时，该绕组接地的两处之间被铁心、机座短路。短路的线圈匝数越多，相电流增加就越大。若两相绕组有两处一同接地，会引起相间短路，焚毁线圈，甚至使变频调速电机不能起动工作。

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