TECO F510 series - Page 304

4-215
- 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
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 03-05) 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 200V series, Delta V = +20 V for 400V series).
Refer to the example in Fig.4.4.83.
DC Bus
KEB Detection Level
10V for 200V series
20V for 400V series
Output
Frequency
Run
Command
KEB
Re-acceleration
Command
Re-acceleration
KEB
operation
Figure 4.4.83 KEB operation