Yaskawa GPD503 Drive - Manual (Page 41)

2.8 DC INJECTION BRAKING Continued
B. Cn-10: DC Inj. Braking Start Frequency Range: 0.0 to 10.0 Hz
Cn-11: DC Inj.Braking Current Factory setting: 50 %
(% of Drive Rated Current)
Range: 0 to 100 %
Cn-13: DC Injection Time at Start Factory setting: 0.5 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. For this operation, application of DC injection braking current is controlled by a
multi-function input (see paragraph 2.8.D).
With ramp to stop enabled (Sn-04 = 0 0 X X), after a STOP command is received the
GPD 503 controls motor deceleration according to the Decel Time setting, until output
frequency reaches the DC Injection Braking Start Frequency (Cn-10 setting). Then the
GPD 503 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
RUN COMMAND
OUTPUT FREQUENCY
STOP
RAMP TO STOP
DC DC
DC INJECTION TIME AT
START (Cn-13)
DC INJ. BRK. START
FREQUENCY (Cn-10)
DC INJECTION TIME AT
STOP (Cn-12)
2-10