Written by using in order to absorb the regenerative electric power generated during regenerative such RTGC (Rubber Tyred Gantry Crane) braking Damage to the equipment unless the emitted power generated during regenerative braking is not braking, due to the voltage of the generator Can occur. Therefore, it is necessary RESISTOR PUMP BACK is capable of absorbing regenerative power. Is determined according to the capacity of the electric motor that uses the frequency of the braking resistor and the capacitor in size.