Rockwell Automation 1336R REGEN LINE REG - Manual (Page 58)

3–6 Regenerative Brake Operation
Regenerative Brake
Sizing This is the peak current the 1336 REGEN Package can return
to the AC utility. For any regenerative application, the peak
AC current calculated in Step 8 (
I
1
), must be less than the peak
current calculated in Step 9 ( I
OL
). Because I
1
is greater than the
rated current of the 1336 REGEN Package, the 1336 REGEN
Package will be operating at its overload region for some
portion of the application cycle.
The 1336 REGEN Package can operate for 1 minute at an
overload of 150% of rated current. At 140% of rated current,
overload time is approximately 77 seconds. Shown below are
the allowable operating times over a range of rated currents.
Figure 3.2 — 1336 REGEN Overload Rating
10. Calculate the overload current for your application ( I
PK
).
To calculate the overload current for your application ( I
PK
),
divide the peak AC current calculated in Step 8 ( I
1
) by the
rated current of the 1336 REGEN Package you plan to use.
I
PK
= I
1
————
I
RATED
Where I
RATED
= The nameplate current of the 1336 REGEN Package
Remember I
PK
must be less than 150% of the 1336 REGEN
Package you plan to use.
See page 3-8 for information on paralleling regenerative
brakes.
160
150
140
110
100
1 10 100 1000 10000
130
120
% of Rated Output Current (I
PK
)
Overload Time (Seconds)