34 Rockwell Automation Publication PFLEX-AT001L-EN-P - September 2017
Chapter 4 Selecting An External Resistor for PowerFlex 7-Class Drives
Protecting External Resistor Packages
Figure 18 - External Brake Resistor Circuitry
ATTENTION: PowerFlex drives do not offer protection for externally mounted
brake resistors. A risk of fire exists if external braking resistors are not protected.
External resistor packages must be self-protected from over temperature or the
protective circuit show below, or equivalent, must be supplied.
Power On
R (L1)
S (L2)
T (L3)
Power Source DB Resistor Thermostat
Power Off
M
M
(Input Contactor) M
Three-Phase
AC Input
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