Leeson SCR Thyristor Motor Control Manual de usuario Pagina 54

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48
Application Notes SPEEDMASTER™ OPERATION MANUAL
Reversing
A dynamic brake may be used when reversing the motor
direction (Figure 26). Use a three pole, three position switch
rated for at least the maximum DC armature voltage and
maximum braking current. When in the brake position, wait for
the motor to stop completely before switching it to either the
forward or reverse direction. See the Dynamic braking section,
page 32, for sizing the dynamic brake resistor.
Note: Model 174709 is equipped with this reversing feature.
MOTOR
A1 A2
FWD
BRAKE
REV
DYNAMIC
BRAKE
RESISTOR
INHIBIT
Figure 26. Reversing Circuit Connection
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