LEXIUM MHDA1004, User Manual, Page: 195 / 204

181
Example Regen Resistor Power Dissipation Calculation, continued
Example Step 2 Identify each deceleration of the plot where the drive is decelerating the load.
Example Step 3 Calculate the energy returned to the drive in each deceleration as follows:
Deceleration 1
ω
= 2
π
3000RPM / 60 = 314 radians/sec
E = ½ 0.01kgm
2
(314 radians/sec)
2
= 493 joules
Deceleration 2
ω
= 2
π
600RPM / 60 = 63 radians/sec
E = ½ 0.01kgm
2
(63 radians/sec)
2
= 20 joules
Deceleration 3
ω
= 2
π
3450RPM / 60 = 361 radians/sec
E = ½ 0.01kgm
2
(361 radians/sec)
2
= 652 joules
Continued on next page
Speed
(RPM)
Deceleration 1
Deceleration 2
Deceleration 3
Time
(seconds)
3000
600
0
-3450
1.0 1.5 2.25 2.5
3.75 4.25
4.75