Chapter 12 Descriptions of Parameter SettingsMS300
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Situation 3: Unexpected power shut down or power loss
Pr.07-13 = 1 and power does not recover
The keypad displays the “dEb” warning and the drive stops after decelerating to the lowest
operating frequency. When the DC bus voltage is lower than the Lv level, the drive
disconnects the soft start relay until the power completely runs out.
Situation 4: Unexpected power shut down or power loss
Pr.07-13 = 2 and power does not recover
The drive decelerates to 0 Hz. The DC bus voltage continues to decrease until the voltage
is lower than the Lv level, and then the drive disconnects the soft start relay. The keypad
displays “dEb” warning until the drive completely runs out of power.
Situation 5: Pr.07-13 = 2 and power recovers after the DC bus voltage is lower than the Lv
level.
The drive decelerates to 0 Hz. The DC bus voltage continues to decrease until the voltage
is lower than the Lv level, and then the drive disconnects the soft start relay. The soft start
relay closes again after the power recovers and the DC bus voltage is higher than the Lv
return level. When the DC bus voltage is higher than the dEb return level, the drive
maintains the frequency for three seconds and starts to accelerate linearly. The “dEb”
warning on the keypad is automatically cleared.
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