Delta MH300 Series - Page 431

Chapter 12 Description of Parameter Settings
MH300
12.1-06-4
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.
Smart over-current stall prevention
 Adopts closed-loop control. It takes the setting for Pr.06-03 over-current stall prevention during
acceleration as target command during acceleration and deceleration, and takes Pr.06-04 over-
current stall prevention during operation as target command at constant speed. When the output
current exceeds the stall prevention level, the controller decreases the output frequency gradually
according to the closed-loop response until the current drops below the stall prevention level, and
returns to target frequency based on the previous setting when the current is lower than the stall
prevention level. If the output current is still higher than the stall prevention level during the
adjustment, the output frequency decreases to the minimum output frequency at 0.5 Hz.