Chapter 12 Descriptions of Parameter SettingsMS300
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start relay remains closed), and the drive executes auto-deceleration.
Situation 1: Momentary power loss, or too low and unstable power voltage, or power supply
sliding down because of sudden heavy load
Pr.07-13 = 1 and power recovers
When the power recovers and DC bus voltage exceeds the dEb return level, the drive
linearly decelerates to 0 Hz and stops. The keypad displays the “dEb” warning until you
manually reset it, so you can see the reason for the stop.
Situation 2: Momentary power loss, or too low and unstable power voltage, or power supply
sliding down because of sudden heavy load
Pr.07-13 = 2 and power recovers
During the dEb deceleration (includes 0 Hz run), if the power recovers to a voltage higher
than dEb return level, the drive maintains the frequency for three seconds and then
accelerates again. The “dEb” warning on the keypad is automatically cleared.
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