Dc Injection Braking Function - Omron SYSDRIVE 3G3MV SERIES User Manual

Advanced Operation
6-5

DC Injection Braking Function

The DC injection braking function applies DC on the induction motor for braking control.
Startup DC Injection Braking:
This braking is used for stopping and starting the motor rotating by inertia with no regen-
erative processing.
DC Injection Braking to Stop:
Adjust the stop DC injection braking time if the motor rotating does not decelerate to a
stop in normal operation due to inertia from a heavy load. By increasing the DC injection
braking time or DC injection braking current, the time required for stopping the motor is
reduced.
n089
DC Injection Braking Current
Setting 0 to 100 (%)
range
n090
DC Injection Braking-to-stop Time
Setting 0.0 to 25.5 (s)
range
n091
Startup DC Injection Braking Time
Setting 0.0 to 25.5 (s)
range
• Set the DC injection braking current as percentage based on the rated current of the Inverter as 100%.
• After the startup DC injection braking time is set, the Inverter starts up at minimum frequency on com-
pletion of the startup DC injection braking control of the Inverter.
• After the speed is reduced, the Inverter is switched to DC injection braking at minimum output fre-
quency.
DC Injection Braking Control
Output
frequency
Minimum
output
frequency
(n016)
Note It is normally not necessary to change the settings of n173 (Proportional Gain for DC Control) and
n174 (
Integral Time Constant for DC Control
6-26
Register
Unit of
setting
Register
Unit of
setting
Register
Unit of
setting
n091
Startup DC injection
braking time
). Adjust n89 to n91 to achieve optimum performance.
0159 Hex Changes during
operation
1% Default setting
015A Hex Changes during
operation
0.1 s Default setting
015B Hex Changes during
operation
0.1 s Default setting
Time
n090
DC injection
braking-to-stop time
Chapter 6
No
50
No
0.5
No
0.0