7-5 Associated Equipment
890CS Common Bus Supply - Frames B & D; 890CD Common Bus Drive and 890SD Standalone Drive - Frames B, C & D
External Braking Resistors
We can supply suitable braking resistors, found on the following pages. Alternatively, you can use the
calculation on page 7-8 to help you select alternative resistors.
IMPORTANT We recommend using a thermal overload switch to protect the braking circuit. Refer to page 7-11.
Main Points
♦ The 890CS unit must be fitted with external braking resistors if braking is required. The 890CS
performs the braking for the 890CS/CD system. There is no internal braking. There are no parameters
to set.
♦ The 890SD unit must be fitted with external braking resistors if braking is required. Use the
DSE 890 Configuration Tool to set the following parameters in the 890SD unit:
Set the INT DB RESISTOR parameter (PREF 31.75 in the DYNAMIC BRAKING function block)
to FALSE. Also enter information about the external resistor being used in to this function block.
Enable the "Brake Resistor" and "Brake Switch" trips in the TRIPS STATUS function block
(DISABLED WORD 1 parameter).
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