Calculation

  1. Determining the cyclic duration factor
    • Cyclic duration factor cdf = braking time/cycle duration
    • Cyclic duration factor cdf = (7 s/28 s) × 100% = 25%
  2. When selecting the braking resistor, observe the assignment of inverter and braking resistor, see chapter "Technical data" > "Braking resistors" > ... > Assignment.
  3. Determine the overload capacity
  4. Determining the overload factor, e.g. for a flatpack resistor at a cyclic duration factor cdf of 25% from the respective diagram.
    • Overload factor OF = 3.0
  5. Calculating the braking power at 100% cdf
    • Braking power 100% cdf = average braking power/overload factor
    • Braking power 100% ED = 0.4 W/3.0 = 0.133 kW
    • The braking power of the braking resistor at 100% cdf must be ≥ 0,133 kW.
  6. Selecting the braking resistor
    • For MOVIMOT® flexible, the minimum permitted braking resistance value = 100 Ω, see chapter "Technical data" > Braking resistors BW.../BW...-T.
    • Selected braking resistor: BW100-005/K1.5
    • Resistance value RBR = 100 Ω
    • Peak braking power: 1.8 kW
    • Current-carrying capacity at 100% cdf: 0.2 kW