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3–4
Regenerative Brake Operation
Regenerative Brake
Sizing
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The following steps should be taken to size a 1336 REGEN Line
Regeneration Package for Regenerative Brake Operation.
1. The 1336 REGEN Converter and 1336 REGEN Precharge
unit must be sized as a package, with both components having
the same nameplate amp rating.
2. In the Regenerative Brake configuration, the 1336 REGEN
Line Regeneration Package removes energy from the DC bus
of a standard drive and returns it back to the utility system. To
calculate the rating of the Line Regeneration Package needed
for a Regenerative Brake application the following informa-
tion must be known:
Nameplate Motor HP
Motor Inertia
Load Inertia
Gear Reduction Ratio
Maximum Motor Speed
Minimum Motor Speed
Minimum Deceleration Time
3. Determine the rated motor torque (
= 5250 × HP
TQ
M
R
—————————
N
HP
Where
= The Rated Motor HP
R
N
= The Base Motor Speed in RPM
4. Determine the total inertia (
2
2
2
× (GR)
wk
t= wk
+ [wk
M
L
2
Where
wk
=
The Motor Inertia in LB-FT
M
2
wk
=
The Load Inertia in LB-FT
L
GR
=
The Total Gear Reduction Ratio Output RPM
5. Determine the required braking torque (
2
t × [N
TQ
= wk
- N
]
B
1
2
———————————
308 × t
2
2
wk
t
Where
=
The Total Inertia
N
=
The Maximum Motor Speed
1
N
=
The Minimum Motor Speed
2
t
=
The Motor's Decel Time from
2
TQ
).
M
2
).
wk
t
2
]
2
2
——————
Input RPM
TQ
).
B
N
N
to
1
2
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