36 Rockwell Automation Publication PFLEX-AT001L-EN-P - September 2017
Chapter 4 Selecting An External Resistor for PowerFlex 7-Class Drives
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
Appendix A
• a power value that is greater than the value calculated in
Step 3 –
Minimum Power Requirements for the Dynamic Brake Resistors on
page 16 (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.
Table 1 - Resistor Selection
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
Appendix A to verify that the resistance value of the selected resistor bank is
greater than the minimum resistance of the drive.
Ohms Watts Watt Seconds Catalog Manufacturer
956.00 Ohms
956.00 179 4225 552-1A PG/PG/IPC
956.00 242 4225 552-1 PG/PG/IPC
956.00 400 6260 555-1A PG/IPC
956.00 597 6260 550-1A PG/IPC
956.00 605 6260 555-1 PG/IPC
956.00 915 6260 550-1 PG/IPC
695.00 248 4929 552-2A PG/IPC
695.00 333 4929 552-2 PG/IPC
695.00 553 7981 555-2A PG/IPC
695.00 825 7981 550-2A PG/IPC
695.00 832 7981 555-2 PG/IPC
695.00 1200 35600 PR550-2 PowerOhm
695.00 1258 15258 550-2 PG/IPC
615.00 Ohms
615.00 180 4225 442-1A PG/IPC
615.00 242 4225 442-1 PG/IPC
615.00 404 4225 445-1A PG/IPC
615.00 602 13302 440-1A PG/IPC
615.00 605 13615 445-1 PG/IPC
615.00 800 31500 PR445-1 PowerOhm
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