YASKAWA A1000 Technical Manual page 92

4.6 Basic Drive Setup Adjustments
Setting 1: Coast to Stop
When the Run command is removed, the drive will shut off its output and the motor will coast (uncontrolled deceleration) to
stop. The stopping time is determined by the inertia and the friction in the driven system.
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
enter Run command until it has come to a complete stop. Use DC Injection at Start
Braking on page 179) or Speed Search
Setting 2: DC Injection Braking to Stop
When the Run command is removed, the drive will enter baseblock (turn off its output) for the minimum baseblock time
(L2-03). When the minimum baseblock time has expired, the drive will inject the amount DC current set in parameter b2-02
into the motor windings to brake the motor. The stopping time in DC Injection Braking to Stop is significantly faster compared
to Coast to Stop.
Note: This function is not available in the control modes for PM motors (A1-02 = 5, 6, 7).
Motor speed
DC Injection Braking time is determined by the value set to b2-04 and the output frequency at the time the Run command is
removed. It can be calculated by:
92
Run
command
Output
frequency
Motor speed
Figure 4.10 Coast to Stop
(Refer to b3: Speed Search on page
Run
command
ON
Output
frequency
Motor coasts
Figure 4.11 DC Injection Braking to Stop
DC Injection brake time
ON OFF
Drive output is shut off
(Refer to b2: DC Injection Braking and Short Circuit
179) to restart the motor before it has completely stopped.
OFF
DC Injection Braking
with the current set in
b2-02
Minimum Baseblock
Time (L2-03)
(b2-04) × 10 × Output frequency
=
Max. output frequency (E1-04)
YASKAWA ELECTRIC TOEP C710616 41B YASKAWA AC Drive - A1000 Quick Start Guide