Determining Dynamic Brake Requirements 2-11
If the cycle cannot be adjusted, the decel time must be extended or the
system inertia lowered to reduce the average load on the resistor.
Another option is to use an external resistor.
Calculate the Percent Average Load. You will need this number to
calculate the Percent Peak Load.
Important: The value of AL should not exceed 100%.
This is the result of the calculation outlined in Step 6. Record this value
on page 3-1
.
This is the result of the calculation outlined in Step 6. Record this value
on page 3-1.
Now that the values of AL and PL have been calculated, they can be used
to determine whether an internal or external resistor can be used. Since
the internal resistor package offers significant cost and space advantages,
it will be evaluated first.
Percent Average Load AL 100
P
av
P
db
--------
×==
AL 100
40
40
----- 100%=×=
Percent Peak Load PL 100
P
b
P
db
--------
×==
PL 100
608.6
40
------------
× 1521%==
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