Delta C2000 Series User Manual page 524

 When using PM, Pr. 07-12 ≠ 0, the speed tracking function is enabled. When Pr. 07-12 = 1, 2 or 3,
the output frequency converts to the actual rotor speed from zero-speed.
dEb Function Selection

Settings
 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
Frame A, B, C, D = Pr. 06-00 + 60V/30V (230V series)
Frame E and above = Pr. 06-00 + 80V/40V (230V series)
 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 power current too low and unstable, 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 that you can see the reason for the stop.
0: Disable
1: dEb with auto-acceleration / auto-deceleration, the drive does not output
the frequency after the power is restored.
2: dEb with auto acceleration / auto-deceleration, the drive outputs the
frequency after the power is restored.
3: dEb low-voltage control, then increase to 350V
to stop
4: dEb high-voltage control of 350V
12.1-07-6
Chapter 12 Description of Parameter SettingsC2000
DC
/ 700V and decelerate to stop
DC DC
Default: 0
/ 700V and decelerate
DC