A90 series Inverter User Guide 8 Options 8.1 Brake Resistor resistor or brake unit to release energy. When the stop performance does not meet customer requirements, there need external brake The power of the brake resistor can be calculated as follows: Pb (The power of braking resistor) = P (the power of inverter) * D (brake duty cycle) D - Brake duty cycle (estimated value) Occasionally brake D = 5% Normally brake D = 10% Centrifuge machine D =20% The table below is the A90 inverter’s recommended rated power an resistance of brake resistor which is for reference only (D=10% ~ 20%). If brake duty cycle is lager the power of brake resistance should be larger.
40 Motor Resistance Cable connected to Inverter model Resistor power (W) (kW) (Ω) the resistor (mm2) A90-2S2R8B 0.4 ≧360 ≧200 1 A90-2S4R8B 0.75 ≧180 ≧400 1.5 A90-2S008B 1.5 ≧180 ≧400 1.5 A90-2S010B 2.2 ≧90 ≧800 2.5 A90-4T2R5B 0.75 ≧360 ≧200 1 A90-4T4R2B 1.5 ≧180 ≧400 1.5 A90-4T5R6B 2.2 ≧180 ≧400 1.5 A90-4T9R4B 4 ≧90 ≧800 2.5 A90-4T013B 5.5 ≧60 ≧1000 4 A90-4T017B 7.5 ≧60 ≧1000 4 A90-4T025B 11 ≧30 ≧2000 6 A90-4T032B 15 ≧30 ≧2000 6 A90-4T038B 18.5 ≧30 ≧2000 6 A90-4T045B 22 ≧15 ≧4000 6