Rockwell Automation DC3E Non-Regenerative DC Drive User Guide 1/4 - 2 HP, 115/230 VAC - Manual (Page 51)

43 Operation
Dynamic braking may be used to rapidly stop a motor
(Figure 11, page 44). For the RUN/BRAKE switch, use a
two-pole, two-position switch rated for at least 250 VDC
and 150% of motor nameplate current. For the dynamic
brake resistor, use a 40-watt minimum, high power,
wirewound resistor, or refer toTable 4 on page 44.
Dynamic brake resistor value
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. Refer to Table 4 (page 44) for recommended
dynamic brake resistor sizes.
Dynamic braking
ATTENTION: Wait for the motor to completely stop
before switching it back to RUN. This will prevent high
armature currents from damaging the motor.
ATTENTION: Armature output can drift full ON with
the switch in the BRAKE position and will be driven
full ON if the minimum speed option is selected with
the inhibit circuit. Failure to observe this precaution
could result in severe bodily injury or loss of life.
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