Siemens SINAMICS S120 Equipment Manual page 406

Options
8.27 L61/L62, L64/L65, braking units
CAUTION
Even when the response threshold is set to a low value, the DC link voltage can still reach
the maximum voltage value (hardware shutdown threshold), thus triggering the
"Overvoltage" error. This can occur, for example, in cases where there is too much
regenerative energy for the available braking power.
To prevent a shutdown with the "Overvoltage" error, the V
(p1240 = 1) and the device connection voltage set accordingly (p0210).
406
max controller must be enabled
dc
S120 Cabinet Modules Equipment Manual
Manual, (GH5), 10/2008, A5E00427098A