3–4
Regenerative Brake Operation
Regenerative Brake
Sizing
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 (
TQ
M
).
TQ
M
=
5250
×
HP
R
—————————
N
Where
HP
R
= The Rated Motor HP
N
= The Base Motor Speed in RPM
4. Determine the total inertia (
wk
2
t
).
wk
2
t= wk
2
M
+ [wk
2
L
×
(GR)
2
]
Where
wk
2
M
=
The Motor Inertia in LB-FT
2
wk
2
L
=
The Load Inertia in LB-FT
2
GR
=
The Total Gear Reduction Ratio
Output RPM
——————
Input RPM
5. Determine the required braking torque (
TQ
B
).
TQ
B
= wk
2
t
×
[N
1
- N
2
]
———————————
308
×
t
2
Where
wk
2
t
=
The Total Inertia
N
1
=
The Maximum Motor Speed
N
2
=
The Minimum Motor Speed
t
2
=
The Motor’s Decel Time from
N
1
to
N
2
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