Yaskawa CIMR-V7AM-091 - Manual (Page 10)

Date: 02/20/05, Rev: 05-02 Page 10 of 15 TM.V7SW.091
KEB Re-acceptance Prohibition Time (Parameter n145)
Used when you do not want to repeat KEB operation when a long-term voltage reduction occurs at
the level where the power loss detection relay does not operate or when a momentary power loss
occurs frequently. If the set value is other than 0.0sec, re-acceptance of the KEB Command is
prohibited from the time when re-acceleration starts at recovery from the power loss to when the set
time elapses. The drive will not perform KEB operation even if a momentary power loss occurs
during prohibition of re-acceptance. A DC bus voltage less than the Undervoltage Detection Level
(n140) result in an Undervoltage trip.
Precautions on Application
1.The multi-function digital input function Acceleration/deceleration Prohibition (set value: 16) is not
supported.
2. If the multi-function digital input function External Baseblock (set value: 12 or 13) is ON during
KEB or the run command is turned OFF when the stopping method is set to "coasting to a stop"
(n005 = 1), the drive enters the baseblock status, resulting in an Undervoltage (UV1) trip because
the drive cannot use regenerative energy from the motor (load). Consideration must be taken so
that the drive will not enter the baseblock status during KEB.
3. Increasing the S-curve time delays the start of KEB operation and can cause Undervoltage trips.
Do not change the initial value (No S-curve, n023 = 0).