變頻器的制動電阻在使用過一段時間后會發生故障，下面是山東變頻器維修給大家總結的幾個維修制動電阻常用的方法。

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.

變頻器正常工作時制動電路是不工作的，在負載慣性大減速時間短，直流回路電壓超過設定限值時，制動單元才會工作，直流電壓通過制動電阻消耗下降至變頻器設定限值以下時，制動電路停止工作。

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.

變頻器內置制動單元的，在制動單元動作時，才在制動電阻上測出制動電壓。外接制動單元，并接在變頻器直流電源的正負ji上，直流電壓超過設定電壓，制動單元工作向制動電阻輸出制動電壓。

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.

當制動電阻有異常時，檢查變頻器制動單元和制動電阻是否故障。檢查變頻器設置是否正確。是否為自由停車，減速時間是否過長。只有在減速制動時制動電路才會工作。

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.