2.2 b: Application
126 YASKAWA ELECTRIC TOEP C710687 03B FSDrive-MV1000 Parameter Guide
u b6: Dwell Function
The Dwell function temporarily holds the frequency reference at a predefined value for a set time before continuing to
accelerate or decelerate.
The Dwell function helps prevent speed loss when starting and stopping a heavy load.
The figure below shows how the Dwell function works.
Note: Set the stopping method to “Ramp to stop” (b1-03 = 0) to use the Dwell function.
Figure 2. 19
Figure 2.19 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.
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.
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)
No. Name Setting Range Default
b6-01
<1> The upper limit is determined by the maximum output frequency (E1-04) and upper limit for the frequency reference (d2-01).
<2> Refer to Control Mode Dependent Parameter Default Values on page 84 for details on default settings.
Dwell Reference at Start 0.0 to 120.0 Hz <1> Determined by A1-02 <2>
b6-02 Dwell Time at Start 0.0 to 10.0 s 0.0 s
No. Name Setting Range Default
b6-03
<1> Range upper limit is determined by the maximum output frequency (E1-04) and the upper limit of the frequency reference (d2-01).
<2> Refer to Control Mode Dependent Parameter Default Values on page 84 for details on default settings.
Dwell Reference at Stop 0.0 to 120.0 Hz <1> Determined by A1-02 <2>
b6-04 Dwell Time at Stop 0.0 to 10.0 s 0.0 s
Goal Tuning Procedure Result
Response
After adjustment
Before adjustment
Time
b6-01
b6-03
b6-02 b6-04
Run Command
Output Frequency
ON
OFFOFF
MV1000ParameterGuide_E_conditional.book 126 ページ ２０１３年１０月１１日 金曜日 午後８時１８分
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