2.10.1Selection of resistance vlaue
Renewable electric energy consumption is almost the braking resistor when braking.
According to the formula U*U/R=Pb,
U refers to stable Braking system of Brake voltage. (Different system has different brake
voltage. Generally select 700V for the system 380VAC).
Pb represents the Braking power.
2.10.2 Selection of Braking Resistor Power
Theoretically, braking resistor power is consistent with braking Power.
According to the formula braking power, 0.7*Pr=Pb*D,
Pr refers to the resistor power,
D refers to braking frequency. (Which is the regeneration process in the proportion of the entire
working process).For example, the braking frequency of elevator is between 20%~30%,the
winding and unwinding is between 20%~30%.The centrifuge is between 50%~60%, Occasional
brake load is 5%. The General selection is 10%.
Table 2-7 MD320 Inverter Bake Components Prototyping Table
Inverter
Model
Recommended
Power of Brake
Resistor
Recommended
Resistance
Value of Brake
Resistor
Braking Unit Remarks
MD320S0.4 80W ≥200Ω
Built-in,
optional
The letter “B” is
attached behind
the Inverter model.
MD320S0.7 80W ≥150Ω
MD320S1.5 100W ≥100Ω
MD320S2.2 100W ≥70Ω
MD320T0.7 150W ≥300Ω
Built-in as
standard
No special
specication
MD320T1.5 150W ≥220Ω
MD320T2.2 250W ≥200Ω
MD320T3.7 300W ≥130Ω
MD320T5.5 400W ≥90Ω
MD320T7.5 500W ≥65Ω
MD320T11 800W ≥43Ω
MD320T15 1000W ≥32Ω
inertia, speed-down time and energy of potential load. Thus, the user needs to select based on
the actual needs. The higher the system inertia, the shorter the speed-down time required, and
more frequent the brake is, and then it needs to select higher power and lower resistance vlaue
for the brake resistor.
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