变频器的制动电阻在使用过一段时间后会发生故障，下面是山东变频器维修给大家总结的几个维修制动电阻常用的方法。

The brake resistance of the frequency converter will break down after using for a period of time. Here are some common methods for the maintenance of brake resistance summarized from the maintenance of Shandong frequency converter.

变频器正常工作时制动电路是不工作的，在负载惯性大减速时间短，直流回路电压超过设定限值时，制动单元才会工作，直流电压通过制动电阻消耗下降至变频器设定限值以下时，制动电路停止工作。

When the load inertia is large and the deceleration time is short, and the DC circuit voltage exceeds the set limit, the brake unit will work. When the DC voltage is reduced to below the set limit by the brake resistance consumption, the brake circuit will stop working.

变频器内置制动单元的，在制动单元动作时，才在制动电阻上测出制动电压。外接制动单元，并接在变频器直流电源的正负ji上，直流电压超过设定电压，制动单元工作向制动电阻输出制动电压。

When the brake unit is in operation, the brake voltage is measured on the brake resistance. The external braking unit is connected to the positive and negative poles of the DC power supply of the frequency converter. The DC voltage exceeds the set voltage, and the braking unit works to output the braking voltage to the braking resistance.

当制动电阻有异常时，检查变频器制动单元和制动电阻是否故障。检查变频器设置是否正确。是否为自由停车，减速时间是否过长。只有在减速制动时制动电路才会工作。

When the brake resistance is abnormal, check whether the brake unit and the brake resistance of the frequency converter are out of order. Check that the frequency converter is set correctly. Whether it is free parking or not, and whether the deceleration time is too long. The brake circuit works only when the brake is decelerated.