Yaskawa V7 Drives - Manual (Page 59)

5-7
n016 : Minimum Frequency Range: 0.1 to 10.0 Hz
n089 : DC Injection Braking Current Factory setting: 50 %
(% of Drive Rated Current)
Range: 0 to 100 %
n090 : DC Injection Time at Stop Factory setting: 0.5 sec
Range: 0.0 to 25.5 sec
n091 : DC Injection Time at Start Factory setting: 0.0 sec
Range: 0.0 to 25.5 sec
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.
DC Braking Sequence
5.7 DC INJECTION BRAKING
RUN COMMAND
OUTPUT FREQUENCY
STOP
RAMP TO STOP
DC DC
DC INJECTION TIME AT
START ( n091 )
MINIMUM
FREQUENCY ( n016 )
DC INJECTION TIME AT
STOP ( n090 )