Chapter 12 Descriptions of Parameter SettingsC2000 Plus
12.1-07-7
dEb (Deceleration Energy Backup) lets the motor decelerate to stop when momentary power loss
occurs. When the power loss is instantaneous, use this function to let the motor decelerate to zero
speed. If the power recovers at this time, the drive restarts the motor after the dEb return time.
Lv return level: Default value depends on the drive power model
Models for frame A, B, C, D0, D = Pr.06-00 + 60V/30V (230V models)
Models for frame E and above = Pr.06-00 + 80V/40V (230V models)
Lv level: Default = Pr.06-00
During dEb operation, other protection such as ryF, ov, oc, occ and EF may interrupt it, and these
error codes are recorded.
The STOP (RESET) command does not work during the dEb auto-deceleration, and the drive
continues decelerating to stop. To make the drive coast to stop immediately, use another function
(EF) instead.
The B.B. function does not work when executing dEb. The B.B. function is enabled after the dEb
function finishes.
Even though the Lv warning does not display during dEb operation, if the DC bus voltage is lower
than the Lv level, MOx = 10 (Low voltage warning) still operates.
The following explains the dEb action:
When the DC voltage drops below the dEb setting level, the dEb function starts to work (soft 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, “dEb active, DC bus voltage returns, output frequency does not return” 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.
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