SV-iS7 User Manual - Inverter Drive Supermarket

Chapter 8 Applied Functions
If the multi-function input, which is set as Speed/Torque, is ON during Vector Torque (DRV09:Vector, DRV10:Yes)
operation, the operation shifts to the vector speed mode according to the Acc/Dec time set in CON50, 51.
If the multi-function input, which is set as Speed/Torque, is ON during Vector Speed (DRV09:Vector, DRV10:No) operation,
the operation immediately shifts to the vector torque mode.
8.1.17 Kinetic energy buffering
If a power outage occurs, the DC link voltage goes down and a low voltage failure occurs blocking output. This function
maintains the DC link voltage by controlling the inverter output frequency during the outage, thereby helping maintain the
interval between the instantaneous outage and the low voltage failure for a longer time.
Group Code No. Function Display Setting Display Unit
CON
8-34
77 KEB Select 1 Yes -
78 KEB Start Lev - 130 %
79 KEB Stop Lev - 135 %
80 KEB Gain - 1000 -
CON-77 KEB Select : Selects Kinetic energy buffering operation with the input power OFF. If 0 Continue is selected,
normal decelerating operation is carried out until low voltage. If 1 KEB Select is selected, the inverter DC part is charged
with the regenerative energy that is generated from the motor by controlling the inverter output frequency.
CON-78 KEB Start Lev, CON-79 KEB Stop Lev : Sets the start and stop point of Kinetic energy buffering operation on
the basis of low voltage (Level 100%) so that the stop level (CON-79) is higher than the start level (CON-78).
CON-80 KEB Gain : This is the gain used for controlling the kinetic energy buffering operation by using the inertia moment
amount of the load. If the load inertia is high, a small gain amount is used. If the load inertia is low, a large gain amount is
used. In case the motor vibrates severely when KEB function operates because of input power cut off, set the gain (CON-
80: KEB Gain) to about a half value of previous set value . In this case do not lower the gain too much because low voltage
trip may happen during the kinetic energy buffering operation.
Caution
1. Depending on the instantaneous interruption time and the load inertia, kinetic energy buffering may
cause low voltage trip when it is decelerated.
2. When inverter operates Energy Buffering operation, the motor will vibrate except for the variable torque
load (Fan, Pump etc.)