Chapter 12 Description of Parameter SettingsCP2000
12.1-07-8
Situation 4:
Pr.07-13=2 “dEb active, DC bus 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 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,
DC bus voltage rises to 350 V
DC
/ 700 V
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 do accelerate linearly, and the dEb warning on the keypad
cleared automatically.
Situation 6: Pr. 07-13=4, dEb high-voltage control
When dEb occurs, the DC bus voltage control level rises to 350 V
DC
/ 700 V
DC
to ramp to
stop. Even though the power recovers and the frequency does not return, dEb activates until
the motor decelerates to 0 Hz.
(1) When dEb activates, it sends dEb warning. When the output frequency reaches 0 Hz, the
operation status is STOP and disables the dEb function, the dEb warning continues.
(2) If power does not recover, the DC bus voltage drops until reaches the Lv level, the drive LvS
error occurs (keypad displays LvS error that covers the dEb display), the Soft Start Relay will
be OFF.
Dwell Time at Acceleration
Default: 0.00
Settings 0.00–600.00 sec.
Dwell Frequency at Acceleration
Default: 0.00
Settings 0.00–599.00Hz
Dwell Time at Deceleration
Default: 0.00
Settings 0.00–600.00 sec.
Dwell Frequency at Deceleration
Default: 0.00
Settings 0.00–599.00 Hz
In the heavy load situation, Dwell can make stable output frequency temporarily.
When the load is heavier, use Pr.07-15–Pr.07-18 to avoid ov or oc protection.
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