YASKAWA OYMC V1000, Programming Manual

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1.2 b: Application
YASKAWA ELECTRIC SIEP C710606 10A YASKAWA AC Drive - V1000 PRELIM. Programming Manual 73
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b6: Dwell Function
The reference hold or Dwell function is used to temporarily hold the output frequency at a
set reference value, for a set time, and then continue to ramp up or stop.
The Dwell at start function can be used when driving a permanent magnet motor in V/f
Control, or a motor with a heavy starting load. The pause in acceleration allows the PM
motor rotor to align with the stator field of the motor, thus reducing the starting current.
Dwell works as shown in the figure below.
Note: Using the Dwell function requires that the stopping method for the drive be set to “Ramp to
Stop” (b1-03 = 0).
Figure 1.23
Figure 1.23 Dwell Function at Start and Stop
The parameters needed to set the Dwell function are described below.
■
b6-01/b6-02: Dwell Reference/Time at Start
b6-01 sets the frequency that is kept for the time set in b6-02 during acceleration.
■
b6-03/b6-04: Dwell Reference/Time at Stop
Parameter b6-03 sets the frequency that is kept for the time set in b6-04 during deceleration.
No. Name Setting Range Default
b6-01 Dwell Reference at Start 0.0 to 400.0 Hz 0.0 Hz
b6-02 Dwell Time at Start 0.0 to 10.0 s 0.0 s
No. Name Setting Range Default
b6-03 Dwell Reference at Stop 0.0 to 400.0 Hz 0.0 Hz
b6-04 Dwell Time at Stop 0.0 to 10.0 s 0.0 s
b6-01
b6-03
b6-02 b6-04
Run command
Output frequency
ON OFF OFF