Chapter 12 Description of Parameter SettingsC2000-HS
12.1-07-8
Situation 3: Power supply unexpected shut down or power loss
Pr. 07-13=1 “dEb active, DC BUS voltage returns, the output frequency does not return” and
the power does not recover.
The keypad displays the “dEb” warning and stops after decelerating to the lowest running
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:
Pr. 07-13=2 “dEb active, DCBUS voltage returns, the output frequency returns” 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 “dEb low voltage control, when the speed is lower than 1/4 rated motor speed,
DCBUS voltage rises to 350V
DC
/ 700V
DC
, the drive ramps to stop.
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 the set time of Pr. 07-14 (default = 3 sec.) and starts to
accelerate linearly, and the dEb warning on the keypad clears automatically.
Situation 6:
Pr. 07-13=4, dEb high-voltage control
When dEb occurs, the DC BUS voltage control level rises to 350V
DC
/ 700V
DC
to ramp to stop.
Even though the power recovers and the frequency does not return, dEb activates until the
motor decelerates to 0Hz.
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