Yaskawa CIMR-V7AM-091 - Manual (Page 2)

Date: 02/20/05, Rev: 05-02 Page 2 of 15 TM.V7SW.091
1. Basic Specification
The basic specifications of KEB (Kinetic Energy Back-up) function are in conformance with the
description of the V7 Technical Manual (TM.V7.01). The following outlines the exclusive
specifications.
In order to prevent the drive from tripping at low voltage because of a momentary power loss or
power failure during operation or the motor from coasting for a long time period, the drive detects a
momentary power loss or power failure immediately when it occurs, and continues control using the
regenerative energy from the motor or decelerates to a stop. (The KEB function and the standard
software function momentary power loss ride through cannot be used simultaneously.)
The power supply is monitored according to the status of the multi-function digital input terminals;
the motor re-accelerates to the former speed at recovery from the power loss (Power loss
detecting relay must be mounted externally and the run command must be kept during momentary
power loss).
Automatic power loss detection function is available in order to make the motor switch to the
regenerated status promptly without tripping even at a momentary power loss or power failure
during high-load operation (However, perfect prevention from tripping depends on the load ratio,
load inertia, motor characteristics or capacitor size in the drive).
Note: This software does not support the energy-saving control.