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4-194
11-47
KEB Deceleration Time
Range
【
0.0~25.5
】
Sec
11-48
KEB Detection Level
Range
230V :
【
190~210
】
V
400V :
【
380~420
】
V
KEB function can be used to keep the inverter from tripping on a 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 inverter uses the KEB deceleration time (11-47) to decelerate the motor and
using 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 inverter 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 03-07) 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 200V
Class, Delta V = +20 V for 400V Class).
Refer to the example in Figure 4.3.95.
DC Bus
KEB Detection Level
10V
:
230V series
20V
:
400V series
Output Frequency
Run command
KEB Re-acceleration
Command
Re-acceleration
KEB
operation
Figure 4.3.95 KEB operation