YASKAWA iQpump1000 Quick Start Manual page 155

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 Injection Braking is 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.
command
frequency
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:
Note: 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.
Setting 3: Coast to Stop with Timer (Used for Back Spin Control on Vertical Turbine Pumps)
When the Run command is removed, the drive coasts to a stop. If parameter b1-11 is set to zero, the coast-timer becomes a
value determined by a combination of output frequency and the C1-02 parameter. However, if b1-11 is set greater than zero,
the coast timer is set to b1-11. If the Run command is re-issued during the coast-timer time, the drive WILL restart when the
coast-timer expires without the need to re-cycle the run command. The coast-timer will operate for both AUTO Mode and
HAND Mode. The coast-timer will still operate when the drive goes to sleep then wakes up.
YASKAWA TOEP YAIP1W 01A YASKAWA AC Drive - iQpump1000 Quick Start Guide
4.6 Basic iQpump Setup and Application Preset Parameters
Run
ON
Output
Motor coasts
Minimum Baseblock
Figure 4.29 DC Injection Braking to Stop
DC Injection brake time
DC Injection braking time
b2-04×10
b2-04
Output frequency when
10%
Stop command was entered
Figure 4.30 DC Injection Braking Time Depending on Output Frequency
Run command
ON
Output
frequency
Figure 4.31 Coast to Stop with Timer
OFF
DC Injection Braking
with the current set in
b2-02
Time (L2-03)
(b2-04) x 10 x Output frequency
=
Max. output frequency (E1-04)
100%
(Maximum output
frequency)
OFF ON
Drive output shut off
Run wait time t
OFF ON
4
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