4-137
11-41
Reference Frequency Disappearance Detection Default: 0
Range
【
0
】
: Decelerate to Stop when Reference Frequency Disappears
【
1
】
: Operation is set by Parameter 11-42 when Reference Frequency Disappears
11-42
Reference Frequency Disappearance Level Default: 80.0
Range
【
0.0–100.0
】
11-43
Hold Frequency at Start Default: 0.0
Range
【
0.0–599.0
】
11-44
Frequency Hold Time at Start Default: 0.0
Range
【
0.0–10.0
】
11-45
Hold Frequency at Stop Default: 0.0
Range
【
0.0–599.0
】
11-46
Frequency Hold Time at Stop Default: 0.0
Range
【
0.0–10.0
】
11-47
KEB Deceleration Time Default: 0
Range
240V :
【
200–400
】
V
480V :
【
400–800
】
V
11-48
KEB Detection Level Default: 240V or 480V
Range
【
0.1–10.0
】
KEB function can be used to keep the AC Drive from tripping on an under voltage condition due to a momentary
power-loss. To enable the KEB function, set parameter 11-47 to a value greater than 0.0 sec.
Upon detection of a power-loss the AC Drive uses the KEB deceleration time (11-47) to decelerate the motor and
uses the regenerative energy from the motor to maintain the DC-bus at a nominal level.
11-48: KEB detection level
If the DC-bus voltage falls below the value set in 11-48, the KEB is activated and the AC Drive starts decelerating
according to the value set in 11-47.
To accelerate back to the original output frequency, one of the digital inputs (03-00 to 03-05) set for 48 (KEB
acceleration) has to be activated and the DC voltage has to rise above 11-48 + delta V (Delta V = +10V for 240V
Class, Delta V = +20 V for 480V Class).
Example:
DC Bus
KEB Detection Level
10V
：
230V series
20V
：
400V series
Output Frequency
Run command
KEB Re-acceleration
Command
Re-acceleration
KEB
operation