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Regenerative Brake
Sizing
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Regenerative Brake Operation
Additional Requirements
In addition to satisfying the peak current requirements, the
application must satisfy the duty cycle limitations of the 1336
REGEN Package. After operating in the overload region, the 1336
REGEN Package must operate at or below rated current for some
period of time before it can be overloaded again. The overload
region is useful for applications requiring intermittent
regeneration, or those that alternate between regeneration and
motoring.
One regeneration profile that is cyclic in nature is shown below.
t
In this case, the motor holds back on an overhauling load (or
regenerates) for
t
seconds. After
positive torque for
seconds. The total cycle time is represented
T–t
by
, and the duty cycle (
T
DC
DC
=
t
%
——
T
The table below summarizes the maximum regeneration time and
duty cycle that the 1336 REGEN Package can handle with various
peak currents for a given overhauling load. As long as
than 150% and the conditions in the table are satisfied, the 1336
REGEN Package will not trip on overload.
Peak Regenerative Current
Maximum on Time
(I
)
(t)
PK
150%
1 Minute
140%
1 Minute, 17 Seconds 75%
130%
1 Minute, 48 Seconds 81%
120%
3 Minutes
110%
9 Minutes
Other applications require deceleration of the load in a cyclic
pattern as shown below.
t
In this case, the required braking torque drops with speed. The
deceleration time is represented by
represented by
T
.
T
time
t
seconds, the motor provides
) is
Maximum Duty Cycle
(DC)
70%
88%
96%
T
time
, and the total cycle time is
t
3–7
I
is less
PK
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