Omron SYSDRIVE 3G3FV User Manual page 217

Advanced Operation
For the DC injection braking current (b2-02), set the value for the current that is output at the time of DC
injection braking. DC injection braking current is set as a percentage of Inverter rated output current,
with the Inverter rated output current taken as 100%. If the DC injection braking time (parameters
b2-03 and b2-04) is longer than one second, set the DC injection braking current to 50% or less.
For the DC injection braking time at start (b2-03), set the DC injection braking operating time for when
the motor is started.
For the DC injection braking time at stop (b2-04), set the DC injection braking operating time for when
the motor is stopped.
DC Injection (Initial Excitation) Timing Chart
Output frequency
H Setting Magnetic Field Compensation (b2-08)
When using the "DC injection braking at startup" (initial excitation) function to bring up the motor's mag-
netic flux before running machinery that requires high starting torque, it may take some time for the
magnetic flux to rise sufficiently. This depends upon the motor's electrical time constant, and is espe-
cially true with high-capacity motors.
This function can be used to apply a stronger magnetic flux current when the "DC injection braking at
startup" (initial excitation) function starts, so that the magnetic field in the motor rises faster and more
reliably.
Parameter Display name p y
number
b2-08 Field Comp@start 0 to 500
This parameter cannot be changed during operation.
Note When b2-08 is 100%, it indicates the motor's no-load current value (motor magnetic flux current).
E1-09
(Min. output frequency)
b2-03
(DC injection braking time at start)
Setting g Units
range
1%
Valid access levels
Default
setting
V/f V/f with
Control
0 Not applicable.
Chapter 6
The larger of b2-01
or E1-09
Time
b2-04
(DC injection braking
time at stop)
Open Loop
PG Vector
Advanced
Flux
Vector
6-43