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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.
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
OFF
OFF
Figure 1.24 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
u
b7: Droop Control (CLV, CLV/PM)
Note:
PM motor control modes are not available in A1000 HHP drive models.
1.2 b: Application
YASKAWA ELECTRIC SIEP YEAHHP 01B YASKAWA AC Drive – A1000 HHP Programming Manual
43
1
Parameter Details
Summary of Contents for A1000 HHP
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