Section 3
Evaluating the Internal Resistor
To investigate the capabilities of the internal resistor package, the values
of AL (Average Percent Load) and PL (Peak Percent Load) are plotted
onto a graph of the Dynamic Brake Resistor’s constant temperature
power curve and connected with a straight line. If any portion of this line
lies to the right of the constant temperature power curve, the resistor
element temperature will exceed the operating temperature limit.
Important: The drive will protect the resistor and shut down the
Chopper transistor. The drive will then likely trip on an
overvoltage fault.
1. Record the values calculated in Section
2.
2. A. Compare the calculated average power to the continuous rating
of the dynamic brake resistor in the frame drive you have
selected. See Table A.A
.
Record the resistor’s continuous rating.
B. If P
ave
is greater than R
cont.
you will need to extend the cycle time
(in seconds) by the result of the following equation.
Evaluating the Capability of the Internal Dynamic Brake Resistor
AL =
PL =
t
3
– t
2
=
P
ave
=
R
cont.
=
P
b
2
-----
Decel×
R
cont
------------------------------- ondssec=
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