Drive output frequency is shut off
Run
Command
Output
Frequency
Motor rpm
ON
OFF
Figure 5.6 Coast to Stop
Note:
After a stop is initiated, any subsequent run command entered will be ignored until the minimum baseblock time (L2-03) has expired. Do not attempt to start the motor up
again until it has come to a complete stop. To start the motor back up before it has stopped completely, use DC Injection at start. See parameter b2-03 for more information.
2: DC Injection Braking to Stop
When the run command is removed, the drive will baseblock (turn off its output) for the minimum baseblock time (L2-03). Once the minimum baseblock
time has expired, the drive will inject DC current into the motor windings to lock the motor shaft. The stopping time will be reduced as compared to coast
to stop. The level of DC Injection current is set by parameter b2-02 (default = 50%). The time for DC Injection Braking is determined by the value set to
b2-04 and by the output frequency at the time the run command is removed.
Note:
This function is not available when using PM Open Loop Vector. DC Injection Brake Time = (b2-04) x 10 x Output Frequency / max frequency (E1-04)
Run
command
Output
frequency
ON
OFF
DC Injection Braking
Time at Stop (b2-04)*
Minimum baseblock time (L2-03)
DC Injection current (b2-02)
DC Injection
Braking
Motor speed
Figure 5.7 DC Injection Braking to Stop
*If an overcurrent (oC) fault occurs during DC Injection Braking to Stop, lengthen the minimum baseblock time (L2-03) until the fault no longer occurs.
3: Coast to Stop with Timer
When the run command is removed, the drive will turn off its output and the motor will coast to stop. If a run command is input before time t (value of
C1-02) expires, the drive will not run and the run command will need to be cycled before operation can occur. The time t (value of C1-02) is determined
by the output frequency when the run command is removed and by the active deceleration time.
Drive Output Voltage Cutoff
Run Wait Time
t
Run Command
Output
Frequency
ON
ON
ON
OFF
OFF
5.2 b: Setup
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YASKAWA ELECTRIC
SIEP C710606 18A YASKAWA AC Drive – V1000 Technical Manual (Preliminary)