2. Calculate resistance
R
with Equation 1.
3. Calculate energy
E
Rpulse
with Equation 2.
4. Select the resistor so that the following conditions are met:
• The rated power of the resistor must be greater than or equal to
P
Rmax
.
• Resistance
R
must be between
R
min
and
R
max
given in the table for the used
drive type.
• The resistor must be able to dissipate energy
E
Rpulse
during the braking
cycle
T
.
Equations for selecting the resistor:
Equation 1
When the drive supply voltage is 208 ... 240 V:
When the drive supply voltage is 380 … 415 V:
When the drive supply voltage is 440 ... 480 V:
Equation 2
Equation 3
For conversion, use 1 hp = 746 W.
R
Calculated brake resistor value (ohm). Make sure that:
R
min
<
R
<
R
max
P
Rmax
Maximum power during the braking cycle (W)
P
Rave
Average power during the braking cycle (W)
E
Rpulse
Energy conducted into the resistor during a single braking pulse (J)
t
on
Braking time (one cycle) (s)
T
Braking cycle time (s)
154 Resistor braking
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