YASKAWA iQpump1000 User Manual page 219

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 (Run Delay
at Stop) 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 Run Delay at Stop timer is set to b1-11. If the Run command is reissued during the Run Delay at Stop
timer time, the drive WILL restart when the timer expires without the need to cycle the Run command. The Run Delay at Stop
timer will operate for both AUTO Mode and HAND Mode. The Run Delay at Stop timer will still operate when the drive goes
to sleep and then wakes up. During the Run Delay at Stop timer execution, the HOA keypad will display the alarm "WrUn".
Both Alarm and Run indicators will blink while the drive waits to execute the Run command.
The wait time t is determined by the output frequency when the Run command is removed and by the active deceleration time.
YASKAWA TOEP YAIP1W 01F YASKAWA AC Drive - iQpump1000 User Manual
4.7 Basic iQpump Setup and Application Preset Parameters
Run
ON
Output
Motor coasts
Minimum Baseblock
Figure 4.37 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 4.38 DC Injection Braking Time Depending on Output Frequency
Run command
ON
Output
frequency
Figure 4.39 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
=
Maximum 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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