Delta MS300 Series User Manual page 303

Chapter 12 Descriptions of Parameter SettingsMS300
 The actual deceleration time of the motor is longer than the deceleration time setting because of
the over-voltage stall prevention.
 1: during deceleration, the drive controls the motor according to the setting for Pr.06-01 and the
recovery voltage of the DC bus. The controller starts when the DC bus voltage reaches 95% of
Pr.06-01. When Pr.06-01 is set to 0, the drive controls the motor according to the operating
voltage and the recovery voltage of the DC bus. This method decelerates according to the
setting for the deceleration time. The fastest actual deceleration time is not less than the
deceleration time setting.
 2: during deceleration, the drive controls the motor according to the setting for Pr.06-01 and the
DC bus voltage. The controller starts when the DC bus voltage reaches 95% of Pr.06-01, auto-
tunes the output frequency and the output voltage to accelerate the consumption of the
regenerative energy according to the drive's capability, and the deceleration time is the result of
the drive's auto-tuning. Use this setting when over-voltage occurs due to unexpected
deceleration time.
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