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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 GPD 315
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 GPD 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 )
Summary of Contents for GPD 315
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