2-7
Step 5 Percent Average Load of the Internal Dynamic Brake
Resistor
Skip this calculation if an external dynamic brake resistor will be used.
AL = Average load in percent of dynamic brake resistor
P
av
= Average dynamic brake resistor dissipation calculated in
Step 4 (watts)
P
db
= Steady state power dissipation capacity of dynamic brake
resistors obtained from
Table 2.A (watts)
Calculate Percent Average Load of the dynamic brake resistor:
Record Percent Average Load of the dynamic brake resistor:
The calculation of AL is the Dynamic Brake Resistor load expressed as a
percent. P
db
is the sum of the Dynamic Brake dissipation capacity and is
obtained from
Table 2.A. This will give a data point for a line to be
drawn on one the curves provided in
Section 3.
Table 2.A Rated Continuous Power for Internal DB Kits
AL =
Drive Voltage Frame
P
db
Internal Resistor Continuous Power (watts)
230 A 48
230 B 28
230 C 40
230 D 36
460 A 48
460 B 28
460 C 40
460 (15HP) D 36
460 (20HP) D 36
AL
P
av
P
db
--------
100×=
AL
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oooooooooo[]
-----------------------------------
100×=
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