INVERTER INVERTER Industrial Automation How to calculate brake

/// INVERTER /// INVERTER /// Industrial Automation How to calculate brake duty? i=1: 4 Inverter FR-A 740 -7. 5 k M Gearbox Pully Lowering speed 3 m/s Lifting distance = 30 m Period of cycle = 120 sec. Load 300 kg Mitsubishi Electric – Inverter basics

/// INVERTER /// INVERTER /// Industrial Automation Needed technical data from the application Load Lifting distance Lowering speed Efficiency Period of cycle Mitsubishi Electric – Inverter basics ML = 300 kg h = 30 m v =3 m/s h Mechanism = 98% h Gearbox h Motor t total = 95% = 92% = 10 min.

/// INVERTER /// INVERTER /// Industrial Automation Calculation of the Potential Energy W pot. = ML X g x h = 300 kg X 9, 81 m/s² x 30 m ML = 300 kg ( Load ) g = 9, 81 m / s² ( gravity ) h = 30 m ( lifting distance ) The potential energy which is stored in the raised load. Is now given back to the brake resistors in time t Brake. Mitsubishi Electric – Inverter basics

/// INVERTER /// INVERTER /// Industrial Automation Brake power if lowering speed is slow Calculation of Braking Time : Within 10 s, the entire potential energy will be feed back into the brake resistors. Calculation of the Brake power : Mitsubishi Electric – Inverter basics

/// INVERTER /// INVERTER /// Industrial Automation Brake power if lowering speed is high Calculation of Braking Time : Within 0, 5 s, the entire potential energy will be feed back into the brake resistors. Calculation of the Brake power : Mitsubishi Electric – Inverter basics

/// INVERTER /// INVERTER /// Industrial Automation Duty cycle Every option which is working with a brake resistor has a duty cycle. With this value you can calculate the shortest time to the next allowed brake duty. Duty cycle Mitsubishi Electric – Inverter basics [%]

/// INVERTER /// INVERTER /// Industrial Automation Ed in case of A 700 and external brake Resistor Jumper PX->PR only PR 100% torque, 10% ED 100% torque, 6% ED Mitsubishi Electric – Inverter basics

/// INVERTER /// INVERTER /// Industrial Automation In case of slow lowering speed Ed fits 10 s Period of cycle = 120 sec. Duty cycle Mitsubishi Electric – Inverter basics

/// INVERTER /// INVERTER /// Industrial Automation But brake power is to high! Braking capability of ABRH series Mitsubishi Electric – Inverter basics