Chapter 1: Overview and Component Specifications
1–4
DURA
pUlse
Drives Dynamic Braking User Manual – 2nd Ed., Rev.C – 06/14/2019
Braking Duty Cycle
Application of a
dUra
pUlse
dynamic braking unit should take into account how often the
motor will stop or decelerate during normal operation. The Duty Cycle is the percentage
of time the brake is actually used during deceleration in comparison to the time elapsed
between each start or acceleration of the motor. This Duty Cycle percentage is necessary to
allow the dynamic braking unit and braking resistor(s) sufficient time to dissipate the heat
created during dynamic braking. If the Duty Cycle is exceeded, the braking resistor will not
cool sufficiently, causing resistance to increase as the temperature rises with the loss of
effective braking torque.
Example:
If in a given application it is determined that it will take 10 seconds for the motor
to decelerate to a stop using dynamic braking, then the motor can only be cycled on and off
continuously every 1.6 minutes (100 seconds).
• 10 / 100 x 100 = 10% Duty Cycle
Duty Cycle = T0/T1 x 100(%)
Braking
Time
Cycle Time
100%
T0
T1
The maximum braking On-Time for the maximum 10% Duty Cycle is 10 seconds.
Summary of Contents for DURA PULSE GS-2DBU
Page 1: ...Dynamic Braking User Manual GS DB_UMW...
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