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.
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.
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.
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.