Yaskawa CIMR-V7AM-091 - Manual (Page 14)

Date: 02/20/05, Rev: 05-02 Page 14 of 15 TM.V7SW.091
2.7 How to Adjust
Cycle the power supply during constant speed operation or acceleration/deceleration to verify that
the drive decelerates or re-accelerates without tripping. If the drive trips during KEB, adjust the
following points.
(1) Undervoltage (UV1) trip occurs when KEB starts.
・ Increase the KEB Starting Voltage (n048). However, increasing it excessively makes the
KEB operation perform even if the power supply is normal. Do not set it higher than power
supply voltage value×√２×0.9.
・ Reduce the KEB Deceleration Time 1 (n045) and increase the KEB Deceleration Ratio
Changeover Time (n047). Excessively rapid deceleration may make the motor stall.
(2) Undervoltage UV1 trip occurs during KEB deceleration.
・ Reduce the KEB Deceleration Time 2 (n046).
(3) Undervoltage UV1 trip occurs at power loss during acceleration.
・ Increase the acceleration time.
(4) Overvoltage OV trip occurs when KEB starts or during deceleration.
・Increase KEB Deceleration Time 1 or 2 (n045, n046).
・ When a braking resistor is not provided, reduce the Deceleration Stall Prevention Operational
Voltage (n049). Reducing it excessively disables the drive to decelerate at normal
deceleration. Do not make it lower than power supply voltage× 2 ×1.2.
・ Add a braking resistor if the above does not help.
(5) Output current or DC bus bar voltage oscillates during KEB operation.
Adjust the AVR Time Parameter (n139). However, reducing it excessively may cause
oscillation during normal operation.