LEESON NEMA 4X SCR Control: 174107.00 - Manual (Page 30)

24
Dynamic Braking
Dynamic braking may be used to rapidly stop a motor (Figure 9,
page 25). For the RUN/BRAKE switch, use a two-pole, two-
position switch rated for at least the maximum DC armature
voltage and and maximum braking current. For the dynamic
brake resistor, use a 40 watt minimum, high power, wirewound
resistor.
Sizing the dynamic brake resistor depends on load inertia, motor
voltage, and braking time. Use a lower-value, higher-wattage
dynamic brake resistor to stop a motor more rapidly.
Warning
Wait for the motor to completely stop before switching it
back to the RUN position. This will prevent high armature
currents from damaging the motor or drive.
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Application Notes