4-4 Selecting An External Resistor
Select Resistor
Select a resistor bank from the following tables or from your resistor
supplier that has all of the following:
• a resistance value that is less than the value calculated (R
db1
in ohms)
• a resistance value that is greater than the minimum resistance listed
in Table A.A
• a power value that is greater than the value calculated in Step 4
(P
av
in watts)
• a watt-second value greater than the value calculated.
If no resistor appears in the following tables that is greater than the
minimum allowable resistance and is less than the calculated maximum
resistance:
• Adjust the deceleration time of the application to fit an available
resistor package.
or
• Use the calculated data to purchase resistors locally.
or
• Consult the factory for other possible resistor packages.
!
ATTENTION: The internal dynamic brake IGBT will be damaged if
the resistance value of the resistor bank is less than the minimum
resistance value of the drive. Use Table A.A to verify that the resistance
value of the selected resistor bank is greater than the minimum
resistance of the drive.
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