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3–8
Regenerative Brake Operation
Regenerative Brake
Sizing
Parallel Regenerative
Brakes
Input Power Conditioning
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The table below summarizes the maximum deceleration times that
the 1336 REGEN Package can provide with various peak currents
when decelerating a load. As long as the peak overload current is
less than 150% and maximum deceleration time is less than that
listed in the table, the 1336 REGEN Package will not trip on
overload. In general, if the load is decelerating to zero speed, there
is no limit on the available duty cycle.
Peak Regenerative Current
Maximum Decel Time
(I
)
(t)
PK
150%
7 Minutes
140%
10 Minutes
130%
21 Minutes
If your application requires a longer deceleration time than that
listed in the table above, the 1336 REGEN Package must be sized
for continuous regeneration as described in Step 8.
For applications requiring more complex regeneration profiles,
contact Allen-Bradley Application Engineering.
Multiple 1336 REGEN Line Regeneration Packages of the same
rating can be paralleled with no de-rating when operating in the
Regenerative Brake configuration. Each package requires its own
3% line reactor and operates independently of any other
Regenerative Brakes in parallel with it. Each Regenerative Brake
should also be separately fused with both AC line fuses and DC
bus fuses to protect the other Regenerative Brakes and the
connected AC drive in case of failure.
ATTENTION: The National Codes and standards
!
(NEC, CENELEC, etc.) and local codes outline the
provisions for safely installing electrical equipment.
Installation must comply with specifications regarding
wire types, conductor sizes, branch circuit protection
and disconnect devices. Failure to do so may result in
personal injury and/or equipment damage.
In general, 1336 REGEN Line Regeneration Package equipment
is suitable for direct connection to a correct voltage AC line.
If the AC input power system does not have a neutral or one phase
referenced to ground as detailed under Ungrounded Distribution
Systems, an isolation transformer with the neutral of the
secondary grounded is highly recommended. If the line-to-ground
voltages on any phase exceed 125% of the nominal line-to-line
voltage, an isolation transformer with the neutral of the secondary
grounded is highly recommended.
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