VM1000 Series
‐143‐
A.2 Selection Guide of Braking Components
Table A-2 is the guide data. Users can select different resistance and power
according to the actual situation, (but resistance must not be less than the value
recommended in the table, while the power can be greater than the value
recommended in the table.) The selection of braking resistor needs to be
determined according to the the power of the motor in the actual application
system. Also,this selection is related to the system inertia,the deceleration time,
potential energy load. Users need to decide according to the real situation.The
bigger the system inertia, the shorter the deceleration time. If the brake is more
frequently,users need to select the higher power and smaller resistance.
The Selection of Resistance
When it is under braking, the braking resistor will consume almost all the
regenerative energy of the motor .
According to the formula: U * U / R = Pb
Formula U ---- braking voltage of systematic stable brake
(Different systems adopt different brake voltage. For 380VAC,the systems
typically adopt 700V)
Pb ---- braking power
Power Selection of Brake Resistor
Theoretically, the braking resistor power is consistent with braking power.
Considering it derate to 70%.
According to the formula: 0.7 * Pr = Pb * D
Pr ---- resistor power
D ---- braking frequency (regeneration process accounts for the proportion of total
working process)
Elevator ----- 20% to 30%
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