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What is the role of BRC parameter on ATV340? Should we set it to no when using regen unit?

When ATVRD.. is used with ATV340, the paremter BRA [dec ramp adaptation] must be set to No.
BCR is a function for enabling braking resistor. 
On ATV340 if BRC=YES and BRA=No then drive will trip in BUFO if no braking resistor connected. 
On ATV340 if BRC=No and BRA=No then drive will brake either to braking resistor (if used) or via regen unit, but will not detect the disconnection of braking resistor.

So in the case of regen unit presence (without braking resitor) set BRC=no.
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