Dc Injection Braking - YASKAWA V7 Technical Manual

5.7 DC INJECTION BRAKING

n016 : Minimum Frequency
n089 : DC Injection Braking Current
(% of Drive Rated Current)
n090 : DC Injection Time at Stop
n091 : DC Injection Time at Start
DC injection can be used to stop a motor whose rotational direction is uncertain at start-up, or to
help stop a coasting motor.
With ramp to stop enabled (n005 = " 0 " ), after a STOP command is received the Drive controls
motor deceleration according to the Decel Time setting, until output frequency reaches the DC
injection braking start frequency (or Minimum Frequency, n016 ). Then the Drive output is turned off
and DC injection current is applied to the motor. The effective DC injection time and current should
be set to provide adequate stopping without excessive motor heating. The DC injection voltage is
determined by the DC injection braking current and motor impedance.
RUN COMMAND
OUTPUT FREQUENCY
DC INJECTION TIME AT
START (n091 )
DC
MINIMUM
FREQUENCY (n016 )
DC INJECTION TIME AT
STOP (n090 )
DC Braking Sequence
5-7
Range: 0.1 to 10.0 Hz
Factory setting: 50 %
Range: 0 to 100 %
Factory setting: 0.5 sec
Range: 0.0 to 25.5 sec
Factory setting: 0.0 sec
Range: 0.0 to 25.5 sec
STOP
RAMP TO STOP
DC