BENSHAW RSi GM2 Series - Kinetic Energy Buffering - KEB

Learning Advanced Features
124
890054-00-00
GM2 Series VFD
Kinetic Energy Buffering - KEB
When the input power is disconnected, the inverter’s DC link voltage decreases, and a low voltage trip
occurs blocking the output. Kinetic energy buffering operation can be used to decelerate the motor
safely under these conditions. The inverter uses regenerative energy from the motor during the power
outage to maintain the DC link voltage. This extends the time for a low voltage trip to occur. For the KEB
feature to operate properly, parameter bA.19 (input voltage) must be set correctly.
Group
Code
Name
Setting
Setting Range
Unit
bA
19
Input power voltage
settings
240/480
170–480
V
Cn
77
Energy buffering selection
0
None
0–2
-
1
KEB-1
2
KEB-2
78
Energy buffering start level
125.0
110.0–200.0
%
79
Energy buffering stop level
130.0
Cn.78–210.0
%
80
Energy buffering P gain
1000
1–20000
-
81
Energy buffering I gain
500
0–20000
-
82
Energy buffering Slip gain
30.0
0–2000.0
%
83
Energy buffering
restoration frequency
10.0
0.0–600.0
sec
In
65~69
Px terminal function setting
52
KEB-1
Select
-
-
Kinetic Energy Buffering Operation Setting Details
Code and
Features
Description
Cn.77 KEB
Select
Select the kinetic energy buffering operation when the input power is
disconnected. If KEB-1 or KEB-2 is selected, it controls the inverter's
output frequency and charges the DC link with regenerative energy
from the motor. KEB-1 operation will allow the inverter to resume
operation after power is restored. KEB-2 operation will decelerate the
motor to a safe stop.
KEB-1 can be activated with a digital input. Set Px terminal (In.65~69) to
52 (KEB-1 Select), and activate the terminal block upon power loss to
run the KEB-1 operation. If KEB-1 Select is selected via the terminal,
KEB-1 or KEB-2 cannot be set in Cn.77.
Configuration
Function
0
None
General deceleration is carried out until a low
voltage trip occurs.