TECO A510s - Reserved Function; KEB Deceleration Time; KEB Detection Level

4-249
Figure 4.4.94 Reserved function
When the inverter is in stop mode, this function can also be used to prevent wind milling. In addition, it can be
used for the purpose of braking using the motor to consume the braking energy resulting in a better controlled
stop. Refer to the DC brake parameter 07-16 for DC braking during start.
Notes:
- The hold function at start is inactive when the hold frequency at start (11-43) is set to a value less than Fmin
(01-08).
- The hold function at stop is inactive when the hold frequency at stop (11-45) is set to a value less than Fmin
(01-08).
11- 47 KEB Deceleration time
Range
0.0~25.5 Sec
11- 48 KEB detection level
Range
200V:190~210 V
400V:380~420 V
575V: 540~570 V
690V: 540~684 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 230V
series, Delta V = +20 V for 460V Series, Delta V = +26 V for 575V Series, Delta V = +30 V for 690V Series).
Refer to the example in Figure 4.4.95.