n016 : Minimum Frequency (Min Frequency) Range: 0.1 to 10.0 Hz
n068 : DC Injection Braking Current (DC Inj Current) Factory setting: 50 %
(% of Drive Rated Current)
Range: 0 to 100 %
n069 : DC Injection Time at Stop (DC Inj Time@Stop) Factory setting: 0.0 sec
Range: 0.0 to 10.0 sec
n070 : DC Injection Time at Start (DC Inj Time@Start) Factory setting: 0.0 sec
Range: 0.0 to 10.0 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 (n004 = "Ramp to Stop" (" 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
5-8
5.7 DC INJECTION BRAKING
RUN COMMAND
OUTPUT FREQUENCY
STOP
RAMP TO STOP
DC DC
DC INJECTION TIME AT
START (n070 )
MINIMUM
FREQUENCY (n016 )
DC INJECTION TIME AT
STOP (n069 )
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