User Manual

Publication 1398-5.0 – October 1998
F-2 Dynamic Braking Resistor Selection
For this type of response, 98% of the energy will be dissipated in 4
time constants. Therefore the average power for each dynamic
braking event can be calculated as:
Equation 1 is used in equation 2 and 3 to put the power in terms of the
motor parameters and the dynamic braking resistance (i.e.,
independent of the load inertia).
Intro
Pt()
J
L
J
M
+()ω
o
2
2τ
------------------------------
e
2–tτ⁄
1.154
K
E
K
T
ω
2
o
R2R
L
+()
-------------------------
e
2t– τ⁄
==
2()
Intro
3()
P
AVE
1
2
---
J
M
J
L
+()ω
o
2
1
4τ
-----


0.144
K
E
K
T
ω
o
2
R2R
L
+()
-------------------------
==