Yaskawa CIMR-V7AM-091 - Manual (Page 9)

Date: 02/20/05, Rev: 05-02 Page 9 of 15 TM.V7SW.091
Undervoltage Detection Level (Parameter n140)
UV1 trip voltage is set when the KEB function is used. Even if KEB operation is active and the DC
bus voltage is reduced, when voltage becomes lower than this level, an Undervoltage (UV1) trip
occurs and the motor coasts.
・Undervoltage detection level: DC bus voltage≦n140
・Undervoltage release level: DC bus voltage≧n140＋15Vdc (30Vdc for 460V units)
Selection of Operation at Power ON (Parameter n141)
Setting parameter n141 to 1 can prohibit operation, at power up, when the run command from the
inputs terminals is already present. The digital operator displays EF blinking during prohibition of
operation. In this condition, cycle the run command to begin normal operation.
Selection of Transistor Operation during Stop (Parameter n142)
When Selection of Transistor Operation during Stop is set to a 1 (enabled), the braking transistor
turns ON when DC bus voltage exceeds the braking transistor operational voltage n049. In common
DC bus applications, set the main drive with the braking transistor to a 1 (enabled) and all others to
0 (disabled).
KEB Compensation Time (Parameter n143)
When the set value of KEB Compensation Time is other than 0.0sec, the drive measures the
duration of the KEB deceleration. If the time is greater than the KEB Compensation Time, an
Undervoltage (UV1) trip occurs and the motor coasts, regardless of the DC bus voltage.
Power Loss Relay Delay Time (Parameter n144)
Sets the time in order to avoid improper detection caused by delayed operation of the power loss
detection relay or frequent KEB operation when KEB operation is performed by DC bus voltage
detection. The drive will continue KEB deceleration after KEB start until the power loss detection
relay delay time elapses. Then it monitors the status of the multi-function digital input KEB
Command and the DC bus voltage and determines whether re-acceleration is required.