Delta CFP2000 Series User Manual page 340

Smart over-voltage stall prevention
 Adopts closed-loop control and takes the setting for Pr.06-01 over-voltage stall prevention as
target command during acceleration, deceleration and constant speed. When the DC bus
voltage is higher than the stall prevention level, the controller increases the output frequency
gradually according to closed-loop response until the DC bus voltage drops below the stall
prevention level, and returns to target frequency based on the previous setting for deceleration
time when the DC bus voltage is lower than the stall prevention level. If the DC bus voltage is
still higher than the stall prevention level during the adjustment, the output frequency increases
to the maximum operation frequency (Pr.01-00).
Traditional over-current stall prevention
 When the output current exceeds the over-current stall prevention level (Pr.06-03) during
acceleration, the output frequency stops accelerating. The output frequency continues to
accelerate when the output current drops below the stall prevention level to protect the drive.
 When the output current exceeds the over-current stall prevention during operation (Pr.06-04),
the output frequency decreases according to the setting for acceleration / deceleration time
selection for over-current stall prevention at constant speed (Pr.06-05). When the output current
drops below the stall prevention level, the output frequency accelerates to the target frequency
according to its previous set acceleration time.
Chapter 12 Description of Parameter SettingsCFP2000
12.1-06-4