Goal Tuning Procedure Result
Suppress long cycle oscillations
(longer than the integral time
setting)
• Increase the integral time (b5-03)
Response
Before adjustment
After adjustment
Time
Suppress short cycle oscillations
• If oscillation cycle time is close to
the derivative time, reduce the
derivative time (b5-05).
• If the derivative time is set to 0.00 s
and oscillations are still a problem,
reduce the proportional gain (b5-02)
or increase the PID primary delay
time (b5-08)
Response
Before adjustment
After adjustment
Time
u
b6: Dwell Function
The Dwell function temporarily holds the frequency reference at a predefined value for a set time then continues accelerating
or decelerating.
The Dwell function helps prevent speed loss when starting and stopping a heavy load with induction motors. When running
a PM motor in V/f control, the pause in acceleration allows the PM motor rotor to align with the stator field of the motor and
reduce the starting current.
The figure below illustrates how the Dwell function works.
Note: Set the stopping method to "Ramp to Stop" (b1-03 = 0) to use the Dwell function.
b6-01
b6-03
b6-02 b6-04
Run Command
Output Frequency
ON
OFFOFF
Figure 5.25 Dwell Function at Start and Stop
n
b6-01, b6-02: Dwell Reference, Dwell Time at Start
Parameter b6-01 determines the frequency that is held for the time set in b6-02 during acceleration.
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
n
b6-03, b6-04: Dwell Reference, Dwell Time at Stop
Parameter b6-03 determines the frequency that is held for the time set in b6-04 during deceleration.
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
5.2 b: Application
150
YASKAWA ELECTRIC SIEP C710616 31B YASKAWA AC Drive – A1000 Technical Manual
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