Motor coasts
DC Injection Braking
with the current set in
b2-02
Run
command
Output
frequency
ON OFF
Motor speed
Minimum Baseblock
Time (
L2-03)
Figure 4.37 DC Injection Braking to Stop
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:
DC Injection brake time
(b2-04) x 10 x Output frequency
Maximum output frequency (E1-04)
=
Output frequency when
Stop command was entered
100%
(Maximum output
frequency)
10%
DC Injection braking time
b2-04×10
b2-04
Figure 4.38 DC Injection Braking Time Depending on Output Frequency
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.
Drive output shut off
Run wait time t
Run command
Output
frequency
ON ON ONOFF OFF
Figure 4.39 Coast to Stop with Timer
The wait time t is determined by the output frequency when the Run command is removed and by the active deceleration time.
4.7 Basic iQpump Setup and Application Preset Parameters
YASKAWA TOEP YAIP1W 01F YASKAWA AC Drive - iQpump1000 User Manual
219
4
Start-Up Programming
& Operation
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