Delta CFP2000 Series User Manual page 277

Chapter 12 Description of Parameter SettingsCFP2000
2: this function can auto-tune the output frequency and output voltage to accelerate consumption

of DC bus energy according to drive's ability, so that the actual deceleration time can comply with
the parameter setting. Use this setting when over-voltage occurs due to unexpected deceleration
time.
12.1-01-12